This expansion slot essentially replaced PCI and AGP slots a AMR b CNR c AGP 8x from NT 1110 at ITT Tech.
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- ISA was replaced with more advanced bus called PCI. The first type of expansion slot we need to be familiar with is the PCI orPeripheral Component Interconnect expansion slot. Although it is now being replaced with newer bus, we can still find it in many older computers. Image 228.2 – PCI Slots. PCI slots are usually colored white.
- An improvement over PCI and could reach up to 1,064 Mb/s. It is primarily used in servers. Was backward-compatible with PCI so the PCI-X expansion cards could plug into PCI expansion slots.most common frequency used with PCI-X is 133 MHz, giving a data throughput rate.
- What expansion slot replaced AGP? PCIe is considered better than other types of expansion slots and is replacing PCI, PCI-X, and AGP. The older PCI standard is half-duplex bidirectional.
What kind of expansion slot should you use for your video card?
There's lots of slots
To add a video card to your computer, you have to pick an expansion slot. There have been many kinds of expansion slots over the years so most motherboards contain more than one kind of slot. They usually have a few of the older slots and a few of the newer ones. The slots differ greatly in speed so you need to pick the right kind of slot.
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The motherboard shown above includes most of the slots that you'll run into these days. It's a little unusual in that you don't often see motherboards which have both PCI-Express slots and an AGP slot. The best slot to use for video cards is the PCI-Express x16 slot. The next best is the AGP slot. The next best is a PCI-Express x1 slot but video cards which fit that slot are very hard to find as of late 2006. The worst choice for a video card is a PCI slot. If you're building or buying a new computer then be sure to get one with a PCI-Express x16 slot. You shouldn't buy anything else. Some low-budget computers are sold with integrated video and have neither a PCI-Express x16 slot or an AGP slot. With that kind of computer you're stuck using a very slow PCI slot when upgrading your video system. You definitely want to avoid that situation. Many low-budget computers with integrated video include either a PCI-Express x16 slot or an AGP slot so be sure to get one of those. That way you'll have good choices available if you decide to upgrade your video system. If you only have a PCI slot then your upgrade choices are extremely limited, underpowered, and overpriced.
Slot kind | Year of introduction | Peak transfer speed |
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PCI-Express x16 | 2004 | 4 GB/s write speed and 4 GB/s read speed simultaneously |
PCI-Express x1 | 2004 | 250 MB/s write speed and 250 MB/s read speed simultaneously |
AGP 8X | 2002 | bandwidth shared between reads and writes to a maximum of 2.133 GB/s; many implementations are limited to 267 MB/s read speed |
AGP 4X | 1998 | bandwidth shared between reads and writes to a maximum of 1.067 GB/s; many implementations are limited to 267 MB/s read speed |
AGP 2X | 1996 | bandwidth shared between reads and writes to a maximum of 533 MB/s; many implementations are limited to 267 MB/s read speed |
AGP 1X | 1996 | bandwidth shared between reads and writes to a maximum of 267 MB/s |
PCI | 1993 | bandwidth shared between reads and writes to a maximum of 133 MB/s |
PCI-Express
PCI-Express is the newest kind of expansion slot used in PCs. It is technologically superior to the older slots in every way. PCI-Express can be referred to using various names: PCI-Express, PCIe, or PCI-E. They all mean exactly the same thing. There's another completely different and incompatible bus called PCI-X so be sure not to get them confused. Despite the similarity in names, there's no hardware compatibility of any kind between PCI and PCI-Express. You can't plug PCI cards into PCI-Express slots or vice versa. It was just the computer industry doing their level best to confuse people. (Just for the record, the USB 2.0, USB High Speed, USB Full Speed naming debacle is the current leader in 'the most confusing naming convention in existance' competition. The PCI-Express, PCI confusion is somewhat farther down the list.)
In PCI-Express x16, the 'x16' part is pronounced, 'times sixteen' or 'by sixteen'. The number following the 'x' is the number of PCI-Express lanes in the slot. The more lanes in the slot, the faster it can go. The motherboard picture above shows both a x16 slot and a x1 slot. Video cards are normally designed to fit in x16 slots since they are the fastest. You can also get video cards designed for x1 slots. Those are normally used only if you want more than one video card in the computer. Most motherboards have one PCI-Express x16 slot for a video card and one or more x1 slots for other things like network adapters. Less common are x4 and x8 slots. You can 'up-plug' PCI-Express cards. That means that you can plug a PCI-Express x1 expansion card into a PCI-Express x1, x4, x8, or x16 expansion slot and it will work (as long as the motherboard BIOS doesn't have bugs). The x1 expansion card can only run at x1 speed in any of those slots but it will work. Likewise, you can plug x4 expansion cards into x4, x8, and x16 slots and you can plug x8 expansion cards (if you can find one) into x8 and x16 slots. But you can't 'down-plug' PCI-Express cards because an expansion card with a higher number of lanes (the 'x' value) physically won't fit into an expansion slot with a lower number of lanes. For example, a x16 expansion card won't fit into a x8, x4, or x1 slot.
When it comes to video cards, some motherboards can be extremely picky about up-plugging. You should always be able to plug a x1, x4, or x8 video card into a x16 PCI-Express slot and have it work. It may only run at x1 speeds but it should work nonetheless. Unfortunately, many motherboards have problems with video card up-plugging. As time passes, the motherboard BIOSes should have better support for up-plugging video cards but for now it may not work. Plugging a x16 video card into a x16 slot always works and plugging a x1 video card into a x1 slot almost always works but the other combinations may not work properly. If you have problems up-plugging a video card then you should go to the motherboard manufacturer's website and update the motherboard BIOS. That's where they will fix problems with expansion card up-plugging.
Some motherboards come with two PCI-Express x16 slots so you can run two full speed video cards at once. This is normally used only by serious gamers who want the highest possible performance in 3D games. NVIDIA has a dual-card implementation called SLI and ATI has a version called CrossFire. In these modes, both video cards work together on the same game to increase performance. Many motherboards with two PCI-Express x16 slots have special rules about using the second x16 slot. With some motherboards you have to plug a small circuit board into the motherboard to enable the second x16 slot. Even when enabled, the second x16 slot may have special restrictions. In some cases that slot may not work with anything but video cards. The manual of a dual x16 slot motherboard will tell you if there are any restrictions related to its x16 slots. Don't assume that you can treat them like 'normal' PCI-Express slots unless the motherboard manual says so.
AGP
The AGP slot was the standard slot used by video cards before it was replaced by PCI-Express x16 slots. They are four different AGP speeds. AGP 8X is pronounced 'AGP eight times'. The eight refers to the speed. There are also slower speeds of 4, 2, and 1 times. When it comes to games, as of late 2006, there is very little speed benefit in going faster than AGP 4X (about 1 GB/s). You gain at most a few percent by going from AGP 4X to a faster slot. As time passes it will make more of a difference. As of late 2006, AGP has a much more limited selection of video cards than PCI-Express x16. AGP cards are usually more expensive than PCI-Express x16 cards in the same speed range. On top of that, the fastest video cards are not available for AGP at all. Basically, AGP is in the process of being orphaned. If you're getting a new computer then make sure that it uses PCI-Express x16 rather than AGP.
You do have to be a little careful when getting AGP cards because not all AGP cards are compatible with all AGP motherboards. If you go shopping for AGP cards right now then all you're likely to find are 'AGP 8X, 4X' cards. Those are compatible with any motherboard which supports AGP 4X or AGP 8X. But there are some old AGP 2X or AGP 1X video cards and there are also old AGP 2X or 1X motherboards. New video cards may not be compatible with old motherboards and old video cards may not be compatible with new motherboards. It's hard to buy the old AGP 2X 1X video cards or motherboards these days but you may run into them. That's why it pays to be careful. That's especially true if you're buying used hardware.
Each AGP card has one or two slots in its card edge. If a video card has the 3.3 volt slot, then it can use 3.3 volt signaling. If it has the 1.5 volt slot then it can use 1.5 volt signaling. If the card has both slots then it can use both signaling voltages. The newest version of AGP added support for 0.8 volt signaling but it did not add a new kind of slot. If a video card supports either 1.5 volt or 0.8 volt signaling then it has the 1.5 volt slot.
The AGP connectors on the motherboard are keyed to prevent insertion of AGP cards which would be damaged if plugged in. An AGP 3.3V motherboard connector can only accept AGP cards which have the 3.3V slot. If you try to insert a card without a 3.3V slot into an AGP 3.3V motherboard connector, the card will bump into the connector key and cannot be inserted. Likewise an AGP 1.5V motherboard connector can only accept AGP cards with the 1.5V slot. An AGP universal motherboard connector has no keys and therefore can accept any kind of AGP card. An AGP card with both voltage slots can be plugged into any kind of AGP motherboard connector. If you can plug an AGP card into an AGP motherboard connector, then they are compatible. So you need to check to see that the video card can fit into the motherboard connector to know if they are compatible. This page gives you a more detailed explanation of the rules AGP compatibility.
PCI
You can still get video cards for PCI slots but they tend to be obsolete and overpriced. The selection is very limited. Many low-end computers come with integrated graphics rather than a separate video card. This is done to cut costs. Unfortunately, integrated graphics are very poor performers at 3D graphics. If you don't play games, then integrated graphics may be just fine. But if you'd like to increase the graphics performance then you need to add a 'real' video card. Unfortunately, some computer manufacturers make some low-end models with integrated graphics which do not have either AGP or PCI-Express x16 slots. You should never buy such a computer. Integrated graphics are okay as long as you have the option to upgrade if you need to. But if you buy one of those bad low-end machines then your only graphics upgrade option is to use a PCI slot. PCI will be a serious performance bottleneck. And you'll get stuck buying an expensive, obsolete, PCI video card. The best way to avoid this miserable fate is to avoid buying these crippled computers in the first place. Make sure that your new computer has an AGP slot or (preferably) a PCI-Express x16 slot. It will save you lots of grief (and money) if you decide to upgrade your graphics system.
When purchasing PCI video cards you need to be careful about compatibility with the PCI expansion slots on the motherboard. There are two things which vary in PCI expansion slots: the voltage, and the number of bits. PCI Slots can support either 3.3 volts or 5 volts. PCI has a system of keys which only allows expansion cards to fit into the motherboard connector if it provides the correct voltage. As shown in the picture above, a 5 volt PCI motherboard connector has a key near the right end. A 5 volt PCI expansion card has a slot which lines up with the key. That allows you to plug a 5 volt PCI card into a 5 volt PCI connector. You can see a 'real' PCI connector in the motherboard picture above. 3.3 volts is similar but its key is near the left end. This system allows you to plug 5 volt cards into 5 volt PCI connectors but not into 3.3 volt PCI connectors. Likewise, you can only plug 3.3 volt cards into 3.3 volt PCI connectors and not into 5 volt connectors. If the expansion card can run on both 3.3 and 5 volts then it has both slots and fits into both 3.3 and 5 volt PCI motherboard connectors. PCI expansion slots also support two different widths: 32 bits, and 64 bits. The 64 bit motherboard connector is longer than a 32 bit connector. Most PC motherboards come with 32 bit slots but some come with 64 bit slots. A 32 bit PCI expansion card will work fine in a 64 bit slot. PCI video cards are 32 bit cards.
Most PCI slots on PC motherboards are 32 bit, 5 volt slots. Most PCI video cards are also 32 bits and 5 volts. Many of the PCI video cards also support 3.3 volts. As a result, most PCI video cards work fine in most PCs. However, there are some motherboards out there with other kinds of PCI slots. 64 bit, 3.3 volt slots are common in workstation-oriented motherboards. If you want to use one of those then you'll need a PCI video card which supports 3.3 volts. So, before purchasing a PCI video card it's a good idea to make sure that the PCI video card and motherboard are compatible. If the PCI video card fits into the motherboard expansion connector then they're compatible.
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(Redirected from Expansion slot)
Example of a PCI digital I/O expansion card
PCI expansion slot
In computing, the expansion card, expansion board, adapter card or accessory card is a printed circuit board that can be inserted into an electrical connector, or expansion slot, on a computer motherboard, backplane or riser card to add functionality to a computer system via the expansion bus.
An expansion bus is a computer bus which moves information between the internal hardware of a computer system (including the CPU and RAM) and peripheral devices. It is a collection of wires and protocols that allows for the expansion of a computer.[1]
- 1History
History[edit]
Even vacuum-tube based computers had modular construction, but individual functions for peripheral devices filled a cabinet, not just a printed circuit board. Processor, memory and I/O cards became feasible with the development of integrated circuits. Expansion cards allowed a processor system to be adapted to the needs of the user, allowing variations in the type of devices connected, additions to memory, or optional features to the central processor (such as a floating point unit). Minicomputers, starting with the PDP-8, were made of multiple cards, all powered by and communicating through a passive backplane.
The first commercial microcomputer to feature expansion slots was the Micral N, in 1973. The first company to establish a de facto standard was Altair with the Altair 8800, developed 1974-1975, which later became a multi-manufacturer standard, the S-100 bus. Many of these computers were also passive backplane designs, where all elements of the computer, (processor, memory, and I/O) plugged into a card cage which passively distributed signals and power between the cards.
Proprietary bus implementations for systems such as the Apple II co-existed with multi-manufacturer standards.
IBM PC and descendants[edit]
IBM introduced what would retroactively be called the Industry Standard Architecture (ISA) bus with the IBM PC in 1981. At that time, the technology was called the PC bus. The IBM XT, introduced in 1983, used the same bus (with slight exception). The 8-bit PC and XT bus was extended with the introduction of the IBM AT in 1984. This used a second connector for extending the address and data bus over the XT, but was backward compatible; 8-bit cards were still usable in the AT 16-bit slots. Industry Standard Architecture (ISA) became the designation for the IBM AT bus after other types were developed. Users of the ISA bus had to have in-depth knowledge of the hardware they were adding to properly connect the devices, since memory addresses, I/O port addresses, and DMA channels had to be configured by switches or jumpers on the card to match the settings in driver software.
IBM's MCA bus, developed for the PS/2 in 1987, was a competitor to ISA, also their design, but fell out of favor due to the ISA's industry-wide acceptance and IBM's licensing of MCA. EISA, the 32-bit extended version of ISA championed by Compaq, was used on some PC motherboards until 1997, when Microsoft declared it a 'legacy' subsystem in the PC 97 industry white-paper. Proprietary local buses (q.v. Compaq) and then the VESA Local Bus Standard, were late 1980s expansion buses that were tied but not exclusive to the 80386 and 80486 CPU bus.[2][3][4] The PC/104 bus is an embedded bus that copies the ISA bus.
Intel launched their PCI bus chipsets along with the P5-based Pentium CPUs in 1993. The PCI bus was introduced in 1991 as a replacement for ISA. The standard (now at version 3.0) is found on PC motherboards to this day. The PCI standard supports bus bridging: as many as ten daisy chained PCI buses have been tested. Cardbus, using the PCMCIA connector, is a PCI format that attaches peripherals to the Host PCI Bus via PCI to PCI Bridge. Cardbus is being supplanted by ExpressCard format.
Intel introduced the AGP bus in 1997 as a dedicated video acceleration solution. AGP devices are logically attached to the PCI bus over a PCI-to-PCI bridge. Though termed a bus, AGP usually supports only a single card at a time (LegacyBIOS support issues). From 2005 PCI-Express has been replacing both PCI and AGP. This standard, approved[Like whom?] in 2004, implements the logical PCI protocol over a serial communication interface. PC/104(-Plus) or Mini PCI are often added for expansion on small form factor boards such as Mini-ITX.
For their 1000 EX and 1000 HX models, Tandy Computer designed the PLUS expansion interface, an adaptation of the XT-bus supporting cards of a smaller form factor. Because it is electrically compatible with the XT bus (a.k.a. 8-bit ISA or XT-ISA), a passive adapter can be made to connect XT cards to a PLUS expansion connector. Another feature of PLUS cards is that they are stackable. Another bus that offered stackable expansion modules was the 'sidecar' bus used by the IBM PCjr. This may have been electrically comparable to the XT bus; it most certainly had some similarities since both essentially exposed the 8088 CPU's address and data buses, with some buffering and latching, the addition of interrupts and DMA provided by Intel add-on chips, and a few system fault detection lines (Power Good, Memory Check, I/O Channel Check). Again, PCjr sidecars are not technically expansion cards, but expansion modules, with the only difference being that the sidecar is an expansion card enclosed in a plastic box (with holes exposing the connectors).
Other families[edit]
Most other computer lines, including those from Apple Inc. (Apple II, Macintosh), Tandy, Commodore, Amiga, and Atari, offered their own expansion buses. The Amiga used Zorro II. Apple used a proprietary system with seven 50-pin-slots for Apple II peripheral cards, then later used the NuBus for its Macintosh series until 1995, when they switched to a PCI Bus. Generally, PCI expansion cards will function on any CPU platform if there is a software driver for that type. PCI video cards and other cards that contain a BIOS are problematic, although video cards conforming to VESA Standards may be used for secondary monitors. DEC Alpha, IBM PowerPC, and NEC MIPS workstations used PCI bus connectors.[5] Both Zorro II and NuBus were plug and play, requiring no hardware configuration by the user.
Even many video game consoles, such as the Sega Genesis, included expansion buses; at least in the case of the Genesis, the expansion bus was proprietary, and in fact the cartridge slots of many cartridge based consoles (not including the Atari 2600) would qualify as expansion buses, as they exposed both read and write capabilities of the system's internal bus. However, the expansion modules attached to these interfaces, though functionally the same as expansion cards, are not technically expansion cards, due to their physical form.
Other computer buses were used for industrial control, instruments, and scientific systems. Some of these standards were VMEbus, STD Bus, and others.
External expansion buses[edit]
Laptops generally are unable to accept most expansion cards. Several compact expansion standards were developed. The original PC Card expansion card standard is essentially a compact version of the ISA bus. The CardBus expansion card standard is an evolution of the PC card standard to make it into a compact version of the PCI bus. The original ExpressCard standard acts like it is either a USB 2.0 peripheral or a PCI Express 1.x x1 device. ExpressCard 2.0 adds SuperSpeed USB as another type of interface the card can use. Unfortunately, CardBus and ExpressCard are vulnerable to DMA attack unless the laptop has an IOMMU that is configured to thwart these attacks.
Applications[edit]
The primary purpose of an expansion card is to provide or expand on features not offered by the motherboard. For example, the original IBM PC did not have on-board graphics or hard drive capability. In that case, a graphics card and an ST-506 hard disk controller card provided graphics capability and hard drive interface respectively. Some single-board computers made no provision for expansion cards, and may only have provided IC sockets on the board for limited changes or customization. Since reliable multi-pin connectors are relatively costly, some mass-market systems such as home computers had no expansion slots and instead used a card-edge connector at the edge of the main board, putting the costly matching socket into the cost of the peripheral device.
In the case of expansion of on-board capability, a motherboard may provide a single serial RS232 port or Ethernet port. An expansion card can be installed to offer multiple RS232 ports or multiple and higher bandwidth Ethernet ports. In this case, the motherboard provides basic functionality but the expansion card offers additional or enhanced ports.
Physical construction[edit]
One edge of the expansion card holds the contacts (the edge connector or pin header) that fit into the slot. They establish the electrical contact between the electronics on the card and on the motherboard. Peripheral expansion cards generally have connectors for external cables. In the PC-compatible personal computer, these connectors were located in the support bracket at the back of the cabinet. Industrial backplane systems had connectors mounted on the top edge of the card, opposite to the backplane pins.
Depending on the form factor of the motherboard and case, around one to seven expansion cards can be added to a computer system. 19 or more expansion cards can be installed in backplane systems. When many expansion cards are added to a system, total power consumption and heat dissipation become limiting factors. Some expansion cards take up more than one slot space. For example, many graphics cards on the market as of 2010 are dual slot graphics cards, using the second slot as a place to put an active heat sink with a fan.
Some cards are 'low-profile' cards, meaning that they are shorter than standard cards and will fit in a lower height computer chassis. (There is a 'low profile PCI card' standard[6] that specifies a much smaller bracket and board area). The group of expansion cards that are used for external connectivity, such as network, SAN or modem cards, are commonly referred to as input/output cards (or I/O cards).
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Daughterboard[edit]
A sound card with a MIDI daughterboard attached
A daughterboard for Inventec server platform that acts as a RAID controller based on LSI 1078 chipset
A daughterboard, daughtercard, mezzanine board or piggyback board is an expansion card that attaches to a system directly. [7] Daughterboards often have plugs, sockets, pins or other attachments for other boards. Daughterboards often have only internal connections within a computer or other electronic devices, and usually access the motherboard directly rather than through a computer bus.
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Daughterboards are sometimes used in computers in order to allow for expansion cards to fit parallel to the motherboard, usually to maintain a small form factor. This form are also called riser cards, or risers. Daughterboards are also sometimes used to expand the basic functionality of an electronic device, such as when a certain model has features added to it and is released as a new or separate model. Rather than redesigning the first model completely, a daughterboard may be added to a special connector on the main board. These usually fit on top of and parallel to the board, separated by spacers or standoffs, and are sometimes called mezzanine cards due to being stacked like the mezzanine of a theatre. Wavetable cards (sample-based synthesis cards) are often mounted on sound cards in this manner.
Some mezzanine card interface standards includethe 400 pin FPGA Mezzanine Card (FMC);the 172 pin High Speed Mezzanine Card (HSMC);[8][9]the PCI Mezzanine Card (PMC);XMC mezzanines;the Advanced Mezzanine Card;IndustryPacks (VITA 4), the GreenSpring Computers Mezzanine modules;etc.
Examples of daughterboard-style expansion cards include:
- Enhanced Graphics Adapter piggyback board, adds memory beyond 64 KB, up to 256 KB[10]
- Expanded memory piggyback board, adds additional memory to some EMS and EEMS boards[11]
- ADD daughterboard
- RAID daughterboard
- Network interface controller (NIC) daughterboard
- CPU Socket daughterboard
- Bluetooth daughterboard
- Modem daughterboard
- AD/DA/DIO daughter-card
- Communication daughterboard (CDC)
- Server Management daughterboard (SMDC)
- Serial ATA connector daughterboard
- Robotic daughterboard
- Access control List daughterboard
- Arduino 'shield' daughterboards
- Beaglebone 'cape' daughterboard
- Raspberry Pi 'HAT' daughterboard.
- Network Daughterboard (NDB). Commonly integrates: bus interfaces logic, LLC, PHY and Magnetics onto a single board.
Standards[edit]
Agp Video Card Slot
- PCI Extended (PCI-X)
- PCI Express (PCIe)
- Accelerated Graphics Port (AGP)
- Conventional PCI (PCI)
- Industry Standard Architecture (ISA)
- Micro Channel architecture (MCA)
- VESA Local Bus (VLB)
- CardBus/PC card/PCMCIA (for notebook computers)
- ExpressCard (for notebook computers)
- Audio/modem riser (AMR)
- Communications and networking riser (CNR)
- CompactFlash (for handheld computers and high speed cameras and camcorders)
- SBus (1990s SPARC-based Sun computers)
- Zorro (Commodore Amiga)
- NuBus (Apple Macintosh)
See also[edit]
- M-Module, an industrial mezzanine standard for modular I/O
References[edit]
- ^'What is expansion bus'. Webopedia.
- ^'MB-54VP'. ArtOfHacking.com. Retrieved 2012-11-17.
- ^'NX586'. ArtOfHacking.com. Retrieved 2012-11-17.
- ^'LEOPARD 486SLC2 REV. B'. ArtOfHacking.com. Retrieved 2012-11-17.
- ^'Motherboards'. Artofhacking.com. Retrieved 2012-11-17.
- ^'PCI Mechanical Working Group ECN: Low Profile PCI Card'(PDF). Pcisig.com. Retrieved 2012-11-17.
- ^ IEEE Std. 100 Authoritative Dictionary of IEEE Standards Terms, Seventh Edition, IEEE, 2000,ISBN0-7381-2601-2, page 284
- ^Jens Kröger.'Data Transmission at High Rates via Kapton Flexprints for the Mu3e Experiment'.2014.p. 43 to 44.
- ^Altera.'High Speed Mezzanine Card (HSMC) Specification'.p. 2-3.
- ^Market Looks to EGA as De Facto Standard, InfoWorld, Aug 19, 1985
- ^Product Comparison: 16-Bit EMS Memory, InfoWorld, Sep 7, 1987
Agp Slot Motherboard
External links[edit]
Expansion Slots Definition
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