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6800utlra SLi problems

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Hi, A mate of mine cant his 2 6800utlra's to work in Sli. Both cards work fine on there own but bomb the system out (blue screen of death) in Sli. Some times windows will find the second card but reports there is a problem with it.


I have read other post on here and have all the bios setting correct.


The only thing that I can see is the Versions are different.


Card 1 version:

Card 2 version:


Would this cause the problem????


This is his system:-


DFI Lanparty UT NF4 SLI-DR Expert

Bios: 12/07/05. NF-CK804-6A61FD4EC-00

Athlon64 4000+ San Diego, Brand ID 4, Revision SH-E4

X4 512MB Corsair XMS3200 DDR400 Platinum

X1 80GB Maxtor 6L080M0 SATA II D,Serial number : ACA4-13F0

NVIDIA Gainward 6800 Ultra 256MB PCI-E

Realtek AC'97 Audio


JEANTECH 600W Modular ATX PSU 24 pin

Windows XP Home (Service Pack2)


Any ideas??





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The drivers are:


VGA- 84.21



We have tried other drivers but all seem to do the same thing.


The BSOD happens when running games/benchtests any thing 3D. Having said that COD2 will work but only at the low resolutions and low detail.


If this is a driver issue, can you recommend ones that work

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I'm at my dads in the country right now -- on 56k -- but I would suspect the PSU could definately be a problem. What are the ratings on the 12v rail(s)? It's easy to forget that the 6-series cards were VERY power hungry...


I'd also be willing to bet that the PSU is not EPS compliant, meaning it doesn't natively support the 8-pin motherboard connector required by the Expert.


Look for something on the recommended PSU list in my signature...

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The PSU is a jean tech 600w modular. It has got the 8 pin connector (which we are using)


Here is a link to my PSU with all the tech data on it.





We have had the system running SLi, but some reason the SM bus reported unknown problem and all so lost the network adaptor. Cant seem to have both running at the same time. Could this be power related again ???.





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Well for one, I have never heard of Jeantech, which probably says a lot.


Try a different PSU from a friend or relative that is on the recommended list in my signautre.


Or you could bring it to a computer shop and have them test it.


If you find that it works, then obviously this is a PSU issue, which I think it probably is.

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