6950 Crossfire Problem

[Stryker7314]

My 6950's in crossfire are performing like crap. I upgraded from a 5970, for the added memory for eyefinity. In BFBC2 I get these checkered looking artifact things when I move around. I get about 45fps on 2 cards and in the 50's with crossfire disabled, that just aint right cause my 5970 was doing in the 60's. This is all at approx 4800 x 1200 give or take due to bezel compensation. My system is as follows. I've used catalyst 11.3 - 11.5, all same issue, I uninstalled properly each time and wiped residual driver trash with Driver Sweeper.

Asus P8P67 mobo - the second pcix slot is set to 4x in bios, not a big deal if you look at comparisons of 8x & 8x vs 16x & 4x.
I7 2600k @ 4.8Ghz stable, watercooled, does not go over 53C when gaming
GSkill Ripjaws- 8GB 1600 Mhz - not overclocked
2 x MSI 6950 2GB - air cooled - not overclocked
PSU Corsair TX950W

 

[notty22]

I think you should 'set' things at 8x-8x, I'm not sure why your at 4x, is it because of a usb3-setting ? I'd at least test the 8x-8x settings.

edit: Those artifacts ,can't be normal. Chance of a faulty card ?, might have to troubleshoot , 1 card at a time.

 

[Stryker7314]

8x-8x is not an option, and from reviews 16x-4x has minimal impact on performance,
I figured out the artifacts come frome enabling vsync, strange.

 

[Spikesoldier]

i would go with 8x 8x. your p67 should be able to do this.

i would try re-seating the cards and cf connectors first.

the artifacts are indicative that one of the vga cards may be defective. i would test each one individually at stock clocks with a stress test such as furmark.

 

[Kaspian]

i

the artifacts are indicative that one of the vga cards may be defective. .

In my case it was the drivers. I bought my 6950 and installed the drivers that came with the card. I started seeing what the OP described. I updated the drivers and that took care of the problem. I only have one card though.

 

[kamikazekyle]

If you've clean removed the drivers and reinstalled, then it's probably a faulty card. I had a 5870 a while back that was doing the same thing in crossfire. I'd get pretty crappy FPS when crossfire was enabled, and odd artifacts. It turned out the 2nd card was faulting. Once the card was RMA'ed, everything was fine. I was also running 16x/4x at the time.

Give the setup a test with just a single card at a time. If the card really is faulty, then you'll see issues when running that card as the only card in the system, while the other will seem fine.

 

[McSquid]

Sorry to potentially bump an old topic but I'm having the EXACT same problem as you. (except im on a EVGA P67FTW) Did you ever get this sorted out?