X1950 Pro's in crossfire, Help!

I've tried this on the ATI forums, futuremark forums etc. No luck, hoping you guys might be able to shed some light.

Hi,
I've been using a Sapphire 256mb x1950 pro for a year or so now and decided to get another to run in crossfire rather than getting a whole new, better card. I ended up with a Connect 3D 256mb x1950 pro that ATI assured me would be compatible. I got it all in and installed and when i switched on crossfire it worked fine. However when i try to run anything graphics intensive like 3dmark or any games the screen develops scrolling lines and becomes unusable. I've let the 3dmark run through and it comes back with a much better score than with a single card, it's just the display that seems to screw up. I've spoken to ATI and they don't seem to have any idea of whats wrong with it and i've googled the problem intensively and come up with one identical case but no solution. Any help would be greatly appreciated.

ASRock ConRoeXFire-eSATA2 Motherboard
Intel Core2 6400 @ 2.13Ghz
Sapphire 256mb x1950 pro
Connect 3d 256mb x1950 pro
2gb DDR2 6400
Arctic Cooling SS350ATC PSU

Im surprised that rig didnt go bang already one card is meant to run on 28Amps and you have 2 on 17 .
Mactronix

try a different power supply as everyone is suggesting.

That is what the made a Dremel for... My best friend...

thats not a bad case...but yeah...its uhhhh....unusual? lol

to be perfectly honest, i havnt seen a case before that had the psu in the front.. then again i dont keep track of cases much.

I know it isn't supposed to, but is it possible there is a problem because of having two different brands? I haven't learned a whole lot about CF though, so I could be wrong. Have you tried using something like GPU-Z and making sure that both cards have the same chipset? They should, but what if they didn't?

http://www.newegg.com/Product/Prod [...] 6817101025
solution thats the same price as a nice power supply, just an option.

I just had a thought, what kind of FPS are you getting ? pretty high i would think and what size screen are you running ?
I have a hunch that it may be as simple as tearing which is a graphical affliction that can happen if your graphics card/s are throwing way more frames at the display than are needed. Try turning on V-Sync in the control pannel of the graphics card and see what happens.
Mactronix

Forgot to mention, when using gpuz, the only difference i noticed was the bus interface on the saphire is PCI-E x16 @ x16 and the connect 3d PCI-E x16 @ x4. Not sure that it would make any difference but assume one of you guys might know better. Ta.

Hey all, just to let you know i managed to fix it, just in case anyone else has the same problem.
Basically the bios on the sapphire card was screwed. I ran atiflash and looked at the information and there was no data in the table under bios information for the sapphire card but was ok on the connect 3d one. I copied the bios from the connect 3d card and forced it onto the sapphire one, restarted in safe mode and then uninstalled the drivers for the cards, restarted again and let it all reinstall and now everything works perfectly, 9000 or so on 3d mark. Cheers to everyone for their input though and hope this helps someone in the future.