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Dual 7970's, Second Card Won't Register

post #1 of 10
Thread Starter 

Here's another thread about how I can't get my Crossfire to work properly. As far as I know, I've tried just about everything to fix the issue but I'm stuck.

 

I just finished my rig today (for the kickoff of Crysis 3!) and I'm Crossfiring two of them in the rig in my signature. After less-than-expected results with the graphics, I started to wonder if by chance only one of my cards was doing work. Turns out I was right, and Windows/CCC cannot recognize my second card. Even worse, my BIOS can't even recognize there being a second graphics card in the board. Everything is under water, and thankfully I at least know the card is working because my Komodo waterblock light comes on. I've reinstalled AMD Catalyst twice and downloaded the latest CAP files. Both cards are getting power, and I even went so far as flipping the Crossfire bridges backwards.

 

At this point, am I looking at a motherboard RMA situation?

post #2 of 10
Might be a pain, but maybe try both cards single to verify that the card isn't dead. And maybe try flip flopping the cards if they are both working. I've had some finicky issues getting my SLI setup to work, but that ended up being a bad bridge. (doubt it's the case in your problem)
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post #3 of 10
Thread Starter 
I mean before I installed waterblocks I did test both cards in slot #1 for functionality, and I doubt that I killed the entire card by installing a water block. Is it possible I tightened the block/backplate too much, and the PCB is bent and not getting solid contact with the PCIe slot?

I'm trying to avoid having to drain my loop and pull everything out
post #4 of 10
That's always fun.

Always, always verify that everything works as intended before modding. So in this case, crossfire before installing both blocks.

I would try to reseat the block to see if that's the issue. If that doesn't work. Try installing the original cooler. If that works, then compare the base of the waterblock to the original cooler to see if there are any differences that might be causing the issue.


[edit] - also, install gpu-z see what it says, post some screenshots too.
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post #5 of 10
Thread Starter 
Alright I'll see what I can do when I get home from work. I did check GPU-Z, that only sees one card as well.
post #6 of 10
Thread Starter 

Okay guys, I'm reviving this thread because I'm having the same issue.

 

I went ahead and RMA'ed the board because I had a NewEgg extended warranty (was on sale for 99 cents when I bought it) on the board. They sent me my new board and this time I made sure to test the crossfire BEFORE I put water in the system. I put both cards in, attached the crossfire bride and booted into BIOS. The BIOS told me both cards registered, and I went ahead and booted into windows. Opening Catalyst Control Center, finally the CrossfireX option appeard for me to enable! Hooray!

 

However soon I ran into issues. After filling the loop, I booted once more into BIOS and lone and behold, the card wasn't registering. I tried booting and rebooting several times: I switched power cables, wiggled the cards, and double checked all connections. The only way that I got both cards to register was removing the CMOS battery for 3 minutes, reseating it, and restarting the computer. The worst part is that every time I move the PC, the card for some reason stops getting registered, and I have to once again have to remove the CMOS battery. And to add to all these problems, yesterday I was playing Crysis 3 and randomly the second 7970 stopped registering in the board mid-game with no warning whatsoever.

 

At this point I'm starting to think the problem lies with the card. Could it be the way I seated my waterblock, or is it a problem with the card itself? Or maybe I should get a return for the motherboard and purchase a different brand?

 

Thanks for all your help.

post #7 of 10
Were you able to flip flop the cards, or does the plumbing prevent you?

Replacing the motherboard ruled out a bad slot, but I'm still curious if flip flopping it would work.

Also, complete shot in the dark but what is your Mobo BIOS? I know some revisions target crossfire compatibility/stability.
post #8 of 10
Thread Starter 

The plumbing prevents me from flopping the cards, but I do plan on trying that once I rule out all my options. I'm running Mayhems fluid, and it's not the cheapest stuff in the world so I'd like to try the other alternatives before I drain the loop.

 

The board has the latest BIOS revision, came from the factory that way.

 

Because the board can't even see the second card, I don't think it matters, but I've got CCC 12.4 Beta (the latest) drivers from AMD installed.

post #9 of 10

12.4 is definitely not the latest drivers. 13.2 Beta 7 (I believe) is the latest. Correct me if I'm wrong, but those are quite old.

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Lucy
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post #10 of 10
Thread Starter 

That might be what I've downloaded, I have no idea right now, but that can be worried about later.

 

The biggest issue is that the BOARD doesn't even see the video card. Once I can get it to register, and register reliably (it doesn't crap out every time I need to move the computer), I can worry about drivers.

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