My PCIe_1 x 16 running at x4

Hey Everyone,
I just recently noticed that my Radeon 6870 is running @ x4 instead of x16.

I use GPU-Z 0.6.6, Saphire Trixx 4.3, and ADIA64 and they all say the same thing that the 6870 is running @ x4 2.0.
In AMD Vision Engine Control Center ----> Information -----> Hardware it says that my max bus setting is PCI Express 2.0 x4.

I have cleaned all my contacts on the card and cleaned out my PCIE x16_1 slot to no avail, updated my motherboard bios to the latest version(F11), and updated my video drivers to the lastest version 12.10, but still showing x4 2.o.

I installed an old Nvidia card that I had and it shows x16 @ 1.1 so I know that the PCIE x16 lane is working correctly. Has anyone came across someting like this before and knows how to fix it?

I just cant figure out if it is hardware or software (maybe chipset drivers and windows 8) that is the problem. Or if it is just not reading the card correctly. I have a 7.8 on the windows index score and P4333 on 3D Mark 11. Are these scores right?

Any help would be appreciated.


Gigabyte 990FXA-ud5
AMD FX 8150 running at 4.32
ATI Radeon 6870 stock
Dual Vizio 26" 1080p monitors
8G Patriot PC3-15000 1866 MHz Ram
2x Crucial M4 SSD in Raid 0
Silverstone Strider 1000w PSU
Windows 8 64bit
7 answers Last reply
More about pcie_1 running
  1. you have the card in the top pcie 16x slot right?
  2. have you installed the newest chipset driver for the mb?? it the chipset of the mb that controls the video card.
  3. Install the newest chipset drivers or insert the card to a PCIe x16 slot.
  4. Yeah I installed the newest chipset drivers from Gigabyte for windows 8 (version 8.982) and have the video card in my PCIe_1 x16 slot. I also have it set PEG in the bios which is meant for the first PCIe_16 slot. I just cant figure it out. Would the old NVidia card read x16 if the chipset drivers did not work?
  5. Have you tried a render test using Gpu-Z to see if it kicks up?
  6. Yeah I tried the render test then loaded AIDA64 and it still shows PCI Express 2.0x16 @ 2.0 x4.
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