GPU Help Required.

[Clairvoyant]

Ok

I have purchased 2 HIS 7950s (Boost Versions).

I have done a fresh install of Win 8 so I know its not nvidia driver related.

These cards have duel bios. I flash the flashable bios as in http://forums.overclockers.co.uk/sho...php?t=18539905.

Both card would not run on that bios in xfire. Stock bios that worked. So I started to test each card. Both failled in the top slot in each bios position. Both worked in the middle slot, again both Bios Positions.

So I thought it was the top slot that had failled.

So I removed all AMD stuff, in driver fusion to clean the drivers out.

I plugged my GTX 670 back in sorted the drivers and it ran 2 runs of Heaven.

So Im confused, it cant be the board as it runs my GTX 670. It cant be the 7950s as they both run Heaven in the middle slot.

So any advice. I have a few days to return the 7950s to OcUK under DSR.

My Board is Gigabyte Z77X-UP5 TH. http://forums.overclockers.co.uk/sho...php?t=18433746
PSU 750 OCZ (ran GTX 670s in SLI).

RAM is Sammy green passed memtest fine.

Im lost what to do.

 

[Clairvoyant]

I was running F12j bios which is the latest, I flashed it to a modded version from this site. http://forums.tweaktown.com/gigabyte/

Now one thing I dont understand is that xfire did work the first time I flashed the modded bios.

I just lost, and fed up I have spent a week so far trying to get this sorted. And am just at the end of my wick.

I dont have any way to test the cards on another system, so cant do that. And the board is Xfire cert.

 

[Clairvoyant]

Ok I have flash the normal F12j Bios. Reflash the 7950 with stock bios I saved.

These cards have a bios switch a protected and a flashable bios.

Bent pins hmmmmm would they get bent would all nvidia and AMD cards need all the pins intact to work.

Right drivers insalled lets see what happens.

 

[Clairvoyant]

Ok

All running at stock. Hmm could it have been the modded bios. I have F12j flashed before I had the cards.

Ok Bed time, more testing tomorrow.

 

[Clairvoyant]

Ran another Heaven, it got to the finished screen with score. Then Lockup, Just when I thought it was fine.

So what is the problem.

 

[Clairvoyant]

Ok just ran Arma 3 for about 5 mins then I get a AMD driver has stopped working.

 

[Clairvoyant]

I flashed them back to stock Bios I saved from GPU-Z.

I think its the Top slot that they dont like. A question about the monitor cable, which card should it be plugged in to (top or bottom).

Hmm also wonder if a 7990 would be better 1 card and all (I know it xfire but in 1 card).

Edit

Could it be the Motherboard that is faulty.