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PCI-E x16 slot only running at x8

Tags:
  • Radeon
  • Power Supplies
  • Video
  • Motherboards
  • PCI Express
  • Graphics
  • Product
Last response: in Graphics & Displays
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March 15, 2011 6:23:18 AM

Hello, on my mother board my PCI-E video slot x16 is only running at x8, I have a strong enough power supply and all the latest drivers as far as i can tell

More about : pci x16 slot running

March 15, 2011 6:31:25 AM

How can you tell that it's running at x8?
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a b ) Power supply
a b V Motherboard
March 15, 2011 2:52:42 PM

MORE Food (info) please. Make and model of MB. I'm assuming you have a x16 GPU card.

The P55/P55A for example.
If you have 2 gpus installed, both X16 slots will operate @ X8
Also if you plug an X4, or X8 addin card into slot 2, both slots will be X8. My ATI 5770 was @ x16, but I then added the Asus U3S6 card in the 2nd X16 slot, Slot 1 (GPU) was downsized to X8.
For P55A (at least some) if you enable the USB3/Sata 6 option in BIOS, the two X16 slots become 2 X8 Slots.
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March 21, 2011 4:43:28 AM

RetiredChief said:
MORE Food (info) please. Make and model of MB. I'm assuming you have a x16 GPU card.

The P55/P55A for example.
If you have 2 gpus installed, both X16 slots will operate @ X8
Also if you plug an X4, or X8 addin card into slot 2, both slots will be X8. My ATI 5770 was @ x16, but I then added the Asus U3S6 card in the 2nd X16 slot, Slot 1 (GPU) was downsized to X8.
For P55A (at least some) if you enable the USB3/Sata 6 option in BIOS, the two X16 slots become 2 X8 Slots.

I'm having this same issue. I know because GPU-Z tells me, MSI 890FXA-GD70, Nvidia 9800 GTX+, just one GPU.

Case: Antec 12000 V3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
CPU cooler: Corsair Hydro H7
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Motherboard: MSI 890FXA-GD70
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
GPU: Nvidia 9800 GTX
http://www.evga.com/articles/399.asp
CPU: AMD Phenom II X4 970 Black Edition Deneb 3.5GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Memory: Corsair Dominator GT (4 x 2 gig)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
CD Burner: MSI 24X DVD+R
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Hard Drive: Western Digital Caviar 500 gig, 6gb/s, 7200 rpm
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
PSU: Antec CP-1000 1000W Continuous
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Tuner: Hauppauge WinTV-HVR-2250 Media Center Kit Dual
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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March 21, 2011 5:06:37 AM

alikum said:
How can you tell that it's running at x8?


bus interface on GPU-Z
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March 21, 2011 6:15:34 AM

I figured mine out, maybe it can help you. If you have multiple PCI-E x16 slots some of them may be electrically configured as PCI-E x8. I figured out that my 1st and 5th PCI-E slots are x16, and the rest are lower. Hope it helps!
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March 21, 2011 6:51:13 PM

Nakkiel said:
I figured mine out, maybe it can help you. If you have multiple PCI-E x16 slots some of them may be electrically configured as PCI-E x8. I figured out that my 1st and 5th PCI-E slots are x16, and the rest are lower. Hope it helps!


1+ your correct, however if your running a less powerful card like a 9800 or a Ati 5770 then the x8 or x16 wont matter. the performance is the same.
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