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6870 stuck in PCI-E 8x mode

post #1 of 6
Thread Starter 
I just put together a new computer a few days ago, been getting lots of problems since day 1 but finally after fixing most of it, the only issue I'm having now is my video card is stuck in pci-e 8x mode!

I tried putting it into a different slot, same thing. I tried installing Windows 7 multiple times, same thing. I'm using the latest 11.2 drivers. My BIOS does not have a PCI-E speed setting that I was able to find.



My computer is

Phenom II X6 1090T
SAPPHIRE Radeon HD 6870 1GB
G.SKILL Ripjaws Series (4 x 2GB) DDR3 1600
MSI 890FXA-GD70
CMPSU-650TX (PSU)

and if it matters, I have a Asus XONAR DS in the PCI slot, and a Blackmagic Intensity in the PCI-E 1x slot.
post #2 of 6
There are four blue PCI Express x16 slots that can be run in (x16/x16/x0/x0) mode or (x8/x8/x8/x8) modes. The blue PCI Express x16 slot in the middle always runs in (x4) mode.

If your other card is in one of the bottom two PCIE slots, all slots revert to 8x (except for the middle).
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Waiting on X399
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post #3 of 6
RMA motherboard. Ask for MSI 890FXA-GD65.
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post #4 of 6
You need to put it in the very top PCI-E slot--the one nearest to where the CPU goes. It is set for either 16x/16x/0x/0x or 8x/8x/8x/8x configuration. Putting it in the very top slot should automatically set it to X16 speed, as long as you don't have more than two cards, or another card is set in the third or fourth PCI-E slot.
    
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by LOL_Wut_Axel View Post
You need to put it in the very top PCI-E slot--the one nearest to where the CPU goes. It is set for either 16x/16x/0x/0x or 8x/8x/8x/8x configuration. Putting it in the very top slot should automatically set it to X16 speed, as long as you don't have more than two cards, or another card is set in the third or fourth PCI-E slot.
I had it on the top PCI-x16 at first but it was still going in 8x mode, so I put it in the 2nd pci-e slot with the same result. While it was on the first slot the PCI-E 1x slot was blocked so I put the blackmagic intensity in the 16x slot right below it. After I placed the video card on the 2nd pci-16x slot the pci-1x slot was now open for me to place the BMI in, so I placed it in there. But it didn't matter since it was still running in 8x mode. Could the normal PCI card or the BMI be causing this? I guess I shall try by taking it out now.

Quote:
Originally Posted by damric View Post
RMA motherboard. Ask for MSI 890FXA-GD65.
Why?

Quote:
Originally Posted by beers View Post
There are four blue PCI Express x16 slots that can be run in (x16/x16/x0/x0) mode or (x8/x8/x8/x8) modes. The blue PCI Express x16 slot in the middle always runs in (x4) mode.

If your other card is in one of the bottom two PCIE slots, all slots revert to 8x (except for the middle).
I don't understand, when I read the handbook it says all 5 of the pci-e slots are 16x with 1 pci and 1 pci-e 1x
post #6 of 6
Thread Starter 
Ok, so I put the video card back onto the top slot and the BMI on to the very bottom slot. All is good now thanks!
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