Help with xfire 7970's needed :[

[Greeny93]

Recently purchased 2x VTX3D X-edition 7970's...

This is the first time i've tried crossfire, and it's really not going well !

#1 - The dual gpu slots on my mobo (P9x79pro) are 1 & 5. The bridges which came with the GPU's are only 2 slots long = Had to put the bottom gpu in slot 4 ( still x16, just not the one stated in the manual, is this an issue?

#3 - Just played a few SC2 games, while monitoring the gpu's. Both crank up to 925 core & 1375 mem, and around 60% each. Which is fine. However, although I was averaging 100~ fps, the game was so laggy, with a few hard-freezes =/ never happened to me before... Going to try without crossfire and see how that goes, will edit when i've tried it!

Thanks a lot - These may be stupidly basic problems? but i've tried and can't get my head around them ! : {

 

[tommybhoy]

1. I bought myself two long CrossFire bridges on the bay for a few quid delivered, when they arrived I was pleasantly surprised as they were smart Asus Rog ones.

2. Don't use Kombuster, at all(it cooks gpus), the second card isn't spinning up as it's built into the driver not too via AMD's Powerplay, use Heaven or 3DMark or similar instead(the forum has threads with links).

Have you checked if SC2 has a working CrossFire profile, try it with CrossFire disabled?

There is a scaling option in CCC, you need to move the slider and it should adjust your display to the proper size.

 

[Fledge]

Are you sure your motherboard even supports crossfire?
I tried to crossfire 7850's on my Asus P8P67 after the OcUK sales enquires people said I could do it.
As it turned out, when I tried to crossfire, the first PCIEx16 slot had bandwidth of x4 and the second was running at x1 - plus it disabled the PCIE slot that my sound card was in. So that wasn't fun.

Check your manual thoroughly.

I just reread your post and I'm not even sure if what i said was relevant. But there it is.

 

[Greeny93]

Thanks for the replies.

Will order a longer bridge later, thanks.
I'm just trying to sort out the profiles, i've downloaded the CAP2 file, but CCC is still saying no application files have been created =/ hmm! trying to sort it out now.
& Yeah the scaling option fixed the other monitor cheers

 

[PaulyD]

I believe the VTX cards are dual bios. Flick it to the other one and you should get the overclocked speeds.

Make sure you have the latest beta drivers installed and 12.11 CAP2 installed as well

 

[ALXAndy]

Are you sure your motherboard even supports crossfire?

Any motherboard with two full sized PCIE slots supports Crossfire. The only requirement for Crossfire to run is the physical slots to put two cards in.

The same isn't true for SLI as it needs to be bios enabled and a fee paid to Nvidia for the pleasure. The only chipsets that you could not run Crossfire on (even if the board supported the physical requirements) were Nforce chipsets (gee I wonder why).

Basically on Nforce Nvidia would stop the board booting if it detected two ATI cards. But that's a thing of the past now, Nforce is dead long live the others (or something)

 

[Greeny93]

Thanks for the advice, fixed 3/5 problems

I'm trying to set up the profiles, downloaded and installed CAP2 though CCC is still saying there are " no application profiles have been created "... any suggestions? New to the whole CCC, doesn't seem to be the most straight forward of programmes, either that or i need moar sleep!

cheers

 

[Fledge]

Any motherboard with two full sized PCIE slots supports Crossfire.

This may be true but if running two GPU's makes one PCIEx16 slot run at x8 and the other at x1 while disabling the PCIEx1 slot then it's not really worth mentioning Crossfire.

 

[ALXAndy]

This may be true but if running two GPU's makes one PCIEx16 slot run at x8 and the other at x1 while disabling the PCIEx1 slot then it's not really worth mentioning Crossfire.

That comes down to what you pay for a board. Some are full 16x 16x, some are 16x 8x, some 16x 4x, 8x 8x and so on.

Running at 8x 8x loses you abot 3% performance over full 16x so it's not a problem unless one lane drops to 4x or 1x.

Any one running two 7970s in Crossfire should have a decent board. Otherwise they have simply cut off their nose to spite their face.

 

[flopper]

13.1 driver?
latest bios etc..