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PCI-E slot not detecting GPU.

soundb0y

soundb0y

soundb0y

Soldato
Joined
19 Mar 2009
Posts
3,518
Location
Hereford
Im having a bit of a problem, using gigabyte 970a-dsr board with 7990 GPUs.

After shutting down and restarting once, one of the pci-e slots is not detecting a card. It is doing this with multiple cards so not the GPU which is at fault.

It is powering them up, but not showing up once you turn the computer on. Is it likely that the slot is broken or could it be a setting somewhere that has changed?

Any way to check?

Many thanks,
 
When you say multiple cards are doing the same, what cards are you trying?

Do you have an old PCI-E card to test the actual slot with [that works in another slot]?
 
UEFI bios by any chance? And when you say its not showing, do you mean it doesn't POST?

I've had two gigabyte boards both not work with the 7990 because of the UEFI bios, would also then cause each board to no longer boot any other cards. Really, really strange but did it with two z68 boards.
 
Yes UEFI Bios, I dont understand what that means. I havent updated it yet.

I have an old 4890 I can try in its place but was trying other 7990s.

It's posting and booting up fine, just not recognising the card, although there is power to it.
 
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The 7990 doesn't support any UEFI bios from the looks of things, I've had to enable CSM support on PCIe to be able to boot mine on my ASUS board.

Sadly don't even get a warning on the Gigabytes (GA-Z68AP-D3 and GA-Z68A-D3-B3) it just refuses to boot.

The card will spin up but then the system won't POST and then restart, continuing this until you unplug it? I then found that if I cleared the CMOS I would get a long beep followed by 3 short beeps from the bios before it went into the same cycle.

I couldn't get any other cards working on either Gigabyte board after this, clearing the CMOS would sometimes get me into the bios but I couldn't ever get it to boot again.
 
Hmm well I have dual 7990s running on the same motherboard in other rigs without a problem. I have tried clearing CMOS and no difference.

Yeah it was doing what you say, keep restarting, but now it just boots up fine and ignores the 2nd card is even there.
 
Oh wait you've got 2x7990s and only one is not being detected? That is different to what I was going on about, I couldn't even get the system to POST with a single 7990 in mine.

If you can get into the bios might be worth checking the CSM settings in your boot settings, make sure its on legacy.
 
Yeah thats right.

I can get into the bios fine. I cant see any settings for CSM, but I have changed boot mode selection to legacy and other pci device rom priority to legacy, and had no change.
 
Im assuming it must be a broken board. My 4890 wont work in that slot either.

Its strange as it sounds like the computer is booting properly with only a card in that slot, but no cards showing in windows and no activity in cgminer.
 
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