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GPU in x8 PCIe slot instead of x16 PCIe slot problems

post #1 of 7
Thread Starter 
Hello,

Here is a question that I should have asked a long time ago. I am still curious to this day of what exactly went wrong. When I first built the system in my sig, I had a terrible time getting windows installed. Windows installation would skip important steps, it took forever to install windows. Once I made it into windows, I would BSOD like crazy while installing any of the drivers for my hardware. I was at a loss. Then I realized that I had installed my MSI 6970 in the PCIe x16_2 grey x8 mode slot of my mobo. I didn't think that this would have caused anything to go wrong but I went ahead and popped it into the PCIe x16_1 slot anyways. And to my surprise I was back into a stable crash free windows. At the time I was using the very first BIOS, 0301. Now I'm at 3402.

Shouldn't a single x16 PCIe card be able to run in the grey x8 slot?? I mean i know there will be some tiny performance loss because of it but to be so incredibly unstble because of it?? Can someone please enlighten me? I'm scared to plug my card in the grey slot to see if it still behaves the same way. Any ideas?
post #2 of 7
Well if your GPU is not in the closest slot to the CPU, then you will have problems. I'm not sure the type of slot was the problem, but it was that you didn't put it in the right slot. That has caused me problems before.
    
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post #3 of 7
Quote:
Originally Posted by ExGreyFox View Post

Hello,
Here is a question that I should have asked a long time ago. I am still curious to this day of what exactly went wrong. When I first built the system in my sig, I had a terrible time getting windows installed. Windows installation would skip important steps, it took forever to install windows. Once I made it into windows, I would BSOD like crazy while installing any of the drivers for my hardware. I was at a loss. Then I realized that I had installed my MSI 6970 in the PCIe x16_2 grey x8 mode slot of my mobo. I didn't think that this would have caused anything to go wrong but I went ahead and popped it into the PCIe x16_1 slot anyways. And to my surprise I was back into a stable crash free windows. At the time I was using the very first BIOS, 0301. Now I'm at 3402.
Shouldn't a single x16 PCIe card be able to run in the grey x8 slot?? I mean i know there will be some tiny performance loss because of it but to be so incredibly unstble because of it?? Can someone please enlighten me? I'm scared to plug my card in the grey slot to see if it still behaves the same way. Any ideas?

Should work without problems, but if I where you, I would test that 2nd PCI-E Slot again to see if the problem still happen, maybe with a low end GPU for be safe.
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post #4 of 7
shouldnt cause any problems unless the slot itself has issues both my gpus are at 8x and they work perfect.
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post #5 of 7
Thread Starter 
I've read around that its a common issue when using just one GPU and sticking it in any slot not closest to the CPU. From what I'm seeing, when you use the 2nd slot it places both slots at 8x (it assumes dual GPU).
Edited by ExGreyFox - 10/2/12 at 12:32pm
post #6 of 7
Quote:
Originally Posted by ExGreyFox View Post

I've read around that its a common issue when using just one GPU and sticking it in any slot not closest to the CPU. From what I'm seeing, when you use the 2nd slot it places both slots at 8x (it assumes dual GPU).

depends how the board is setup also if it will post from the 2nd slot usualy it wont have problems if not then you do need to have it in the 1st slot.
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by Bal3Wolf View Post

depends how the board is setup also if it will post from the 2nd slot usualy it wont have problems if not then you do need to have it in the 1st slot.

Got it, thank you sir.
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