🎰 Everything You Need to Know About the PCI Express - Slots and Cards of 5 - Hardware Secrets

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The number in parentheses shows how many electrical PCIe lanes are routed to the expansion slot. For example, x16(8) means that the expansion slot is mechanically a x16 length connector, with eight PCIe lanes connected. A x16 graphics card runs at the bandwidth of the slot it is plugged into.


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Using PCI-E X16 Video Card in a PCI-E X8 Slot I want to install a new graphics card so I can run dual monitors. I bought a video card from someone who swore it was the right one but it doesnt appear to be.


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The PCI Express standard is one of the staples of modern computing, with a slot on more or less every desktop computer made in the last decade.
Understanding the PCI Express Bus As an upgrade to the original PCI Peripheral Component Interconnect system, PCI Express had one huge advantage when it was initially developed in the early 2000s: it used a point-to-point access bus instead of a serial bus.
That meant that each individual PCI port and its installed cards could take full advantage of their maximum speed, without multiple cards or expansions being clogged up in a single bus.
PCI Express replaced the older PCI slot standard.
This motherboard supports both: PCIE x16 in blue, PCIE x1 in black, and PCI in beige.
The old PCI standard was like a deli, everyone waiting in a single line to get served, with the speed of service limited by a single person at the counter.
With dedicated data lanes for each expansion card or peripheral, the entire computer can access components and accessories faster.
Life in the Fast Lanes PCI-E has gone through multiple revisions since its inception; currently new motherboards generally use version 3 of the standard, with the faster version 4 becoming more and more common and version cpu card slot expected to hit in 2019.
But the different revisions all use the same physical connections, and those connections can come in four primary sizes: x1, x4, x8, and x16.
Different sized cards support different maximum PCI-Express lanes.
The different physical sizes allow x16 graphics card in x8 slot different numbers of simultaneous data pin connections to the motherboard: the larger the port, the more maximum connections on the card and the port.
Different revisions of the PCI-E standard allow for different speeds on each lane.
But generally speaking, the more lanes there are on a single PCI-E port and its connected card, the faster data can flow between the peripheral and the rest of express slot sound card computer system.
Going back to our bar metaphor: if x16 graphics card in x8 slot imagine each patron sitting at the bar as a PCI-E device, then an x1 lane would be a single bartender serving a single customer.
What Peripherals Use Which Ports?
For the common revision 3.
RELATED: So a device that uses a PCI-E x1 port, like a low-power sound card or a Wi-Fi antenna, can transfer data to the rest of the computer at approximately 1GBps.
A card that bumps up to the physically larger x4 or x8 slot, like a USB 3.
The PCI-E x16 ports, with a theoretical maximum of around 15GBps on the 3.
Most discrete graphics cards use a full PCI-E x16 slot.
There are a small amount of PCI-E mounted solid state drives that prefer an x4 port, click to see more those seem to have been swiftly overtaken by.
High-end network cards and enthusiast equipment like adapters and RAID controllers use a mix of x4 and x8 formats.
Cheaper motherboards with more budget-oriented chipsets might only go up to a single x8 slot, even if that slot can physically accommodate an x16 card.
This enthusiast motherboard includes five full-sized PCI-E x16 slots, but only two of them have the full 16 data lanesβ€”the others are x8 and x4.
Obviously, this can cause problems.
If your motherboard has two x16-sized slots, but one of them has only x4 lanes, then plugging your fancy new graphics card into the wrong slot could bottleneck its performance by 75%.
The point is, the right card needs to go in the right slot.
Luckily, the lane capacity of the specific PCI-slots is generally spelled out in the computer or motherboard x16 graphics card in x8 slot, with an illustration of which slot has which capacity.
Also, a shorter x1 or x4 card x16 graphics card in x8 slot : the initial pin configuration of the electrical contacts makes it compatible.
So remember, when buying expansion or upgrade cards for PCI Express slots, you need to be mindful of both the size and the lane rating of your available ports.
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Also, a shorter x1 or x4 card can physically fit into a longer x8 or x16 slot: the initial pin configuration of the electrical contacts makes it compatible. The card may be a bit loose physically, but when screwed into place in the expansion slots of a PC case, it’s more than adequately sturdy.


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The x8 slot has an x16 connector but its only electrically wired as an x8. I did a quick test and the video card *seems* to work fine in the x8 slot but I haven't tried running 3 monitors or other.


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The graphics card should go into the first PCI Express x16 slot. However, lower slots are usually capable of running the card as well. Slot Selection and Compatibility


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GTX 480 SLI PCIe Bandwidth Perf. - x16/x16 vs. x8/x8.. When the PCIEX8_1 slot is populated with a PCI Express graphics card, the PCIEX16_1 slot will operate at up to x8 mode.


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Suit for PCIE X1 X4 X8 X16 slot. This PCIe to PCI Adapter Card expands two PCI slot via your. Support two PCI 32 bit 33MHz bus. PCI Specification 2.2 Specification compliant. half high PCI card,Chassi...


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PCI Express 3.0 x16: 1 x PCI Express x16 slot, running at x16 (PCIEX16)* * Actual support may vary by CPU. * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot. 1 x PCI Express x16 slot, running at x8 (PCIEX8)* * Actual support may vary by CPU.


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Amazon's Choice for pci express x8 graphics card ZOTAC GeForce GT 730 Zone Edition 4GB DDR3 PCI Express 2.0 x16 (x8 lanes) Graphics Card (ZT-71115-20L) 4.1 out of 5 stars 260


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The maximum graphics configuration with an 800W power supply can include two 75-watt cards (one in slot two, one in slot four), or one 175-watt card in slot two or slot four. If a graphics card greater than 75 watts is used, leave the adjacent slot empty and follow any additional workstation configuration restrictions.


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Bus Type PCI Express 2.0 x16 @ x8 . So I don't think that it is x16 enabled with just the one card. However, I don't think it would make all that much difference except possibly when the graphics is being used intensively. I'm not a gamer, the most intensive use I make of the graphics card is in video editing and I haven't found it a problem.


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As far as I know, no.
There is however some code that's been submitted for open source amd drivers.
The Meshify S2 has a.
This is a test that's been put through the paces for just about every generation of PCI Express, and it's worth refreshing now that the newest line of high-end GPUs has hit the market.
The curiosity is this: Will a GPU be bottlenecked by PCI-e 3.
We decided to test that question for internal research, but ended up putting together a small report for publication.
PCI Express Theoretical Max Bandwidth The theoretical maximum bandwidth of PCI-e 3.
PCI-e Gen3 x16 performance.
That means there's a 66.
Maybe you've got a thermal concern or a card that butts-up against the CPU cooler, or some sort of liquid routing challenge.
HSIO lanes are assigned to ancillary devices β€” like PCIe SSDs β€” and won't eat into the CPU lanes available to the GPU.
We're also not testing multiple GPUs, which is where we'd like to go next once we've got two of the same GTX 1080 in the lab.
We're also hoping to test dual-GPU, single-card configurations between an x8 and an x16 slot, as those may put more load on the interface.
We used our normal test bench detailed below for this research.
The EVGA X99 Classified motherboard is picky with its PCI-e slot utilization, and uses UEFI to clearly inform whether the connected device is receiving 1, 4, 8, or 16 lanes.
We switched between the first x16 slot and the first x8 slot for these numbers, then validated in BIOS and software.
PCI-e generations can also be forced in the EVGA UEFI, but we did not explore the impact of PCI-e 2.
Game Test Methodology We tested using our GPU test bench, detailed in the table below.
Our thanks to supporting hardware vendors for supplying some of the test components.
Game settings were manually controlled for the DUT.
All games were run at presets x16 graphics card in x8 slot in their respective charts.
We disable brand-supported technologies in games, like The Witcher 3's HairWorks and HBAO.
All other game settings are defined in respectivewhich we publish separately from GPU reviews.
Our test x16 graphics card in x8 slot, in x16 graphics card in x8 slot event manual testing is executed, are also uploaded within that content.
This allows others to replicate our results by studying our bench courses.
Windows 10-64 build 10586 was used for testing.
Each game was tested for 30 seconds in an identical scenario, then repeated multiple times for parity.
Average FPS, 1% low, and 0.
We do not measure maximum or minimum FPS results as we consider these numbers to be pure outliers.
Instead, we take an average of the lowest 1% of results 1% low to show real-world, noticeable dips; we then take an average of the lowest 0.
GN Test Bench 2015 Name Courtesy Of Cost Video Card This is what we're testing!
That data is reported at the engine level.
Metro: Last Light Shadow of Mordor Call of Duty: Black Ops 3 GTA V Ashes of Singularity Dx12 Here's what we've got for performance: Between AVG FPS metrics in Metro: Last Light, we're seeing a 1.
Between 1% low metrics, that difference is 0.
For Shadow of Mordor, the numbers are similar β€” we're seeing a 0.
Black Ops 3, when there is a difference, shows one also just below 1%.
GTA V shows a difference of 0.
Ashes is similarly small.
When a reasonable performance gap is shown β€” like the ~1% difference in Metro: Last Light numbers β€” it is imperceptible to the user but measurable with our tools.
And we do mean imperceptible β€” we're talking 96FPS vs.
Metro, by the slot samsung card j6 sd, is the most reliable FPS benchmarking tool we have ever used.
The game produces almost precisely the same AVG, 1% low, and 0.
From a quick look, there is a little below a 1% performance difference in PCI-e 3.
The difference is not even close to perceptible and should be ignored as article source to users fretting over potential slot or lane limitations.
We are not sure how this scales with SLI particularly MDA 'mode' or dual-GPU cards, but hope to research once we've got more hardware in click the following article lab.
We are also currently investigating the impact of PCI-e lanes on lower capacity VRAM cards, like 4GB.
Hits to system resources may stress the interface more.
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We see this most often with the mainstream series of CPUs (currently Haswell) and chipsets (Z87, H87, etc.) where if you want to use multiple video cards (or install any other type of PCI-E card in the second x16 slot), the video card(s) will only run at x8 speeds rather than the full x16 speed you would otherwise get.


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Server Fault is a question and answer site for system and network administrators.
Join them; it only takes a minute: I have a motherboard with only one x16 PCIe slot and no x8 slots.
I am buying a NIC with very specific galaxy slot card s7 samsung sd, x16 graphics card in x8 slot it is available for x8 slots only.
Can I plug a x8 card in a x16 slot?
I have googled this question and this seems quite possible.
However, I need answer from an expert.
Also, are there any performance implications?
Endpoints can support 1x, 2x, 4x, 8x, 16x, and 32x, though there are no slots specifically for 2x and 32x.
Speed is specified by major version number 2.
What really is: Usually slot sound card should happen is what actually happens.
But there are quite a few boards especially enthusiast boards that do not follow spec.
Some motherboards will not use anything but a 16x video card in their first PCIe slot.
Others will not auto-negotiate correctly commonly falling back to less lanes - this seems particularly common with 2x cards that negotiate to 1x speed.
In server grade hardware these problems are very rare, but it happens.
Also, try searching your particular motherboard and see if anyone has reported a problem.
Aye, many consumer board BIOSes are broken.
I hope that whatever he used to put a x8 NIC in will be better.
Even longer version: A x1 card will work fine in a x1 slot.
A x1 card will also work fine in a x4 slot.
But it will be limited to x1 speeds.
A x1 card will also work fine in a x8 slot.
But it will be limited to x1 speeds.
A x1 card will also work fine in a x16 slot.
But it will be limited to x1 speeds.
A x4 card will work in an x1 slot, but will be limited to x1 speeds.
A x4 card will also work fine in a x4 slot.
A x4 card will also work fine in a x8 slot.
continue reading it will be limited to x4 speeds.
A x4 card will also work fine in a x16 slot.
But it will be limited to x4 speeds.
A x8 card will work in x16 graphics card in x8 slot x1 slot, but will be limited x16 graphics card in x8 slot x1 speeds.
A x8 card will also work fine in a x4 slot.
It will be limited to x4 speeds.
A x8 card will also work fine in a go here slot.
A x8 card will also work fine in a x16 slot.
But it will be limited to x8 speeds.
A x16 card will work in an x1 slot, but will be limited to x1 speeds.
A x16 card will work in an x4 slot, but will be limited to x4 speeds.
A x16 card will work in an x8 slot, but will be limited to x8 speeds.
A x16 card will work in an x16 slot.
Slots allowing up to x16 lanes are most common.
However the same physical connector can be used for x1, x4, x16 graphics card in x8 slot and x16.
In many server class motherboards you will find slots which physically allow x16 cards, but with only 8 lanes connected.
The reverse is also possible.
If you take a x1 connector and use a saw to open the end of the slot then you can physically connect a larger card and it should work.
I know at least one company which does this to put PCIe x16 cards in PCIe x1 slots.
They use the PCIe x16 slots for other cards.
I have seen several posts on the web on installing PCIe x8 graphic card on server motherboad.
I have a IBM X3200 M3 Xeon 3430 Quad Core server.
Though the server has onboard graphics, I could install successfully a PCIe x8 graphic card.
ASUS GT-730-SL-2GD3-BRK It takes some time 30-60 seconds for IBM IMM to show up but works like a charm.
Trust this helps those who would like to convert their server into a kind of workstation.
I think the more complete and generalised answer above may be more applicable than this answer.
Provide details and share your research!
To learn more, see our.
Browse other questions tagged or.

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The IBM x3850 M2 has a total of 7 PCI-e extension cards, and I would like to put in a Graphics Card or five,,, But I would be really Happy to get the first one running. Link to x8 Graphics Card.


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I have a Dell T610 server that I use for some application development.
I want to install a new graphics card so I can run dual monitors.
I bought a video card from someone who swore it was the x16 graphics card in x8 slot one but it doesnt appear x16 graphics card in x8 slot be.
The video card is a PCI-E x16, my server only has PCI-E x8 slots.
Is it possible to use a PCI-E X16 card in my server?
I have heard a rather extreme suggestion that if I cut the graphics card to fit my X8 slot it will work but I am VERY skeptical.
Is there some sort of adapter I can use?
Do I just need to get a different card?
I wear a lot of hats - Developer, Database Administrator, Help Desk, etc.
Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform.
My advise is read more try it out and if it doesn't work as desired, buy a x8 card.
From: A connection between any two PCIe devices is known as a link, and is built up from a collection of 1 or more lanes.
All devices must minimally support single-lane x1 link.
Devices may optionally support wider links composed of 2, 4, 8, 12, 16, or 32 lanes.
In both cases, PCIe will negotiate the highest mutually supported number of lanes.
Do not cut the card - that is likely s d slot damage something on it.
Get one suited to an x8 slot, which is probably an x1 card, since x16 and x1 cards are the only ones being manufactured that I know of.
Yes, but you'll need to make a minor modification to your motherboard x16 graphics card in x8 slot not the graphics card.
This prevents you inserting an x16 board.
However it's just a bit of plastic and if it is carefully removed and there are no other physical obstructions on the motherboard or inside the case then a x16 card can be used but of course will only run at the lowest bus speed available you should never make any adjustments to the expansion card itself.
Compare "open" x8 sockets with "closed" x8 sockets to see the simple difference.
Open-ended - click the following article the short blue x8 socket with the full length x16 This is the normal Here's the showing the 5 "x8" sockets - as you can see practically the only useful socket will be socket 2 counting from the center of the board out as the others x16 graphics card in x8 slot physical obstructions that would prevent a longer card being attached.
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Just wanted to see how this worked out for you.
I am having the same problem and wish X16 graphics card in x8 slot had stepped up to the T710 which comes with an x16 slot.
Were you able to fit the card in one of the two true x8 slots?
Was there enough clearance for the long card?
It's more than this solution.
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the card is indeed in the top X16 slot (in the second slot it is not recognized at all, resulting in a black (standing by) monitor screen though Windows booting normally. I did run GPU-Z Render Test and it would change PCI-E 3.0x16 @ x8-1.1 to PCI-E 3.0x16 @ x8-3.0. I also tried different settings in BIOS with no luck.


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Basically you can buy a cheap (x16 video card and cut a slot in the card at the appropriate place (using a fine toothed hacksaw) so that it can be installed in a x8 slot as below. Or you can cut the back of the x8 slot on the motherboard to allow the rear part of a x16 card to hang out the back (of the now open connector).


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Bus Type PCI Express 2.0 x16 @ x8 . So I don't think that it is x16 enabled with just the one card. However, I don't think it would make all that much difference except possibly when the graphics is being used intensively. I'm not a gamer, the most intensive use I make of the graphics card is in video editing and I haven't found it a problem.


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This allows reducing the size of the space needed on the motherboard.
For example, if a slot with an x1 x16 graphics card in x8 slot is required, the motherboard manufacturer can use a smaller slot, saving space on the motherboard.
However, bigger slots can actually have fewer lanes than the diagram shown in Figure 5.
For example, many motherboards have x16 slots that are connected to x8, x4, or even x1 lanes.
With bigger slots it is important to know if their physical sizes really correspond to their visit web page />Moreover, some slots may downgrade their speeds when their lanes are shared.
The most common scenario is on motherboards with two or more x16 slots.
With several motherboards, there are only 16 lanes connecting the first two x16 slots to the PCI Express controller.
This means that when you install a single video card, it will have the x16 bandwidth available, but when two video cards are installed, each video card will have x8 bandwidth each.
Preview Product The motherboard manual should supply this information.
But a practical tip is to look inside the slot to see how many contacts it has.
If you read more that the contacts on a PCI Express x16 slot are reduced to half of what they should be, this means that even though this slot is physically an x16 slot, it actually has eight lanes x8.
If with this same slot you see that the number of contacts is reduced to a quarter of what it should have, you are seeing an x16 slot that actually has only four lanes x4.
It is important to understand that not all motherboard manufacturers follow this; some still use all contacts even though the slot is connected to a lower number of lanes.
The best advice is to check the motherboard manual for the correct information.
A little-known fact is that you can x16 graphics card in x8 slot any PCI Express expansion card in any PCI Express slot.
It is up to the motherboard manufacturer whether or not to provide slots with their rear side open.
The only disadvantage is that it will only have the maximum bandwidth provided by the slot; i.
On the other hand, this kind of installation may be useful in some situations, such as when building a computer with several video cards to have multiple displays available, and you are not worried about gaming performance.
To reach the maximum performance possible, both the expansion card and the PCI Express controller available inside the CPU or inside the motherboard chipset, depending on your system have to be of the same revision.
If x16 graphics card in x8 slot have a PCI Express 2.
The same video card installed on an old system with a PCI Express 1.
Figure 5: Types of PCI Express slots Figure 6: Details of the PCI and PCI Express slots on a motherboard Figure 7: Differences on the edge contacts of PCI Express, AGP and PCI video cards Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published.
He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil.
He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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I have a motherboard with only one x16 PCIe slot and no x8 slots. I am buying a NIC with very specific configuration, but it is available for x8 slots only. Can I plug a x8 card in a x16 slot?


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Server Fault is a question and answer site for system and network administrators.
Join them; it only takes a minute: I have a motherboard with only one x16 PCIe slot and no x8 slots.
Can I plug a x8 card in a x16 read article />I have googled this question and this seems quite possible.
However, I need answer from an expert.
Also, are there any performance implications?
Endpoints can support 1x, 2x, 4x, 8x, 16x, and 32x, though there are no slots specifically for 2x and 32x.
Speed is specified by major version number 2.
What really is: Usually what should happen is what actually happens.
But there are quite a few boards especially enthusiast boards that do not follow spec.
Some motherboards will not use anything but a 16x video card in their first X16 graphics card in x8 slot slot.
Others will not auto-negotiate correctly commonly falling back to less lanes - this seems particularly common with 2x cards that negotiate to 1x speed.
In server grade hardware these problems are very rare, but it happens.
Also, try searching your particular motherboard and see if anyone has reported a problem.
Aye, x16 graphics card in x8 slot consumer board BIOSes are broken.
I hope that whatever he used to put a x8 NIC in will be better.
Even longer version: A x1 card will work fine in a x1 slot.
A x1 card will also work fine in a x4 slot.
But it will be limited to x1 speeds.
A x1 card will also work fine in a x8 slot.
But it will be limited to x1 speeds.
A x1 card will also work fine in a x16 slot.
But it will be limited to x1 speeds.
A read article card will work in an x1 slot, but will be limited to x1 speeds.
A x4 card will also work fine in a x4 slot.
A x4 card will also work fine in a x8 slot.
But it will be limited to x4 speeds.
A x4 card will also work fine in a x16 slot.
But it will be limited to x4 speeds.
A x8 card will work in an x1 slot, but will be limited to x1 speeds.
A x8 card will also work fine in a x4 slot.
It will be limited x16 graphics card in x8 slot x4 speeds.
A x8 card will also work fine in a x8 slot.
A x8 card will also work fine in a x16 slot.
But it will be limited to x8 speeds.
A x16 card will work in an x1 slot, but will be limited to x1 speeds.
A x16 card will work in an x4 slot, but will be limited to x4 speeds.
A x16 card will work in an x8 slot, but will be limited to x8 speeds.
A x16 card will work in an x16 slot.
Slots allowing up to x16 lanes are most common.
However the same physical connector can be used for x1, x4, x8 and x16.
In many server class motherboards you will find slots which physically allow x16 cards, but with only 8 lanes connected.
The reverse is also possible.
If you take a x1 connector and use a saw to open the end of the slot then you can physically connect a larger card and it should work.
I know at least x16 graphics card in x8 slot company which does this to put PCIe x16 cards in PCIe x1 slots.
They use the PCIe x16 slots for other cards.
I have seen several posts x16 graphics card in x8 slot the web on installing PCIe x8 graphic card on server motherboad.
I have a IBM X3200 M3 Xeon 3430 Quad Core server.
Though the server has onboard graphics, I could install successfully a PCIe x8 graphic card.
ASUS GT-730-SL-2GD3-BRK It takes some time 30-60 seconds for IBM IMM to show up but works like a charm.
Trust this helps those who would like to convert their server into a kind of workstation.
I think the more complete and generalised answer above may be more applicable than this answer.
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The x8 slot has an x16 connector but its only electrically wired as an x8. I did a quick test and the video card *seems* to work fine in the x8 slot but I haven't tried running 3 monitors or other.


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x16 graphics card in x8 slot