Hi,

I seem to have the same problem as with Nvidia GTX295/Cuda, I thought was not an issue with 5970. Latest CAL installs, both GPUs are available in Windows, but only one GPU is avaibale in BOINC.

BOINC log says:
"18/03/2010 18:19:38 ATI GPU 0: ATI Radeon HD5800 series (Cypress) (CAL version 1.4.553, 1024MB, 2320 GFLOPS peak)
"

It should also see the other GPU.

Dummy plug or no dummy plug - same result.
Extending or not extending desktop - same result.

This is sooo frustrating, as I invested in two 5970s to move away from the hazzle of gtx295 which can only run to perfection on WinXP (Nvidia 480 needs first to be released, then drivers matured).

Looking at the top hosts here, all are Win7 and 5970 (still recognized as 5800 series by BOINC), so I hope you could shed some light on this.

Thanks!

Morten

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Morten Ross

I had to remove the Nvidia card in order for both GPUs to be usable/enable CrossfireX. I don't know why or how the Nvidia interfered with ATI, as both should work in same system...

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Morten Ross

Hi Morton

I run three boxes each with twin 5970's.

All are cross fired, and all GPU's work when plugged into the top right socket on the card. IE: the one furthest away from the mobo.

Windows 7
BOINC 6.10.xx, (now .40 with the downtime.)
Hope this helps.

PS: As a side effect of this setup, I can not run Collatz.

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I had to remove the Nvidia card in order for both GPUs to be usable/enable CrossfireX. I don't know why or how the Nvidia interfered with ATI, as both should work in same system...

They will all play together. The Crossfire cards need to be in the first two slots. The Nvidia card can go in the third.
I use this setup in one of my i7's. The GTX260 is devoted to Seti.

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I think my problem is that this mobo is Nvidia 790i :-(

As for the slots use, that's the way I've done it as well.

After I got the first 5970 working, I installed the second. I got all 4 GPUs available to Boinc once with one physical monitor attached, and when I disconnected the monitor I was back to seeing only 2 GPUs no matter what. I'm back on trying dummy plug again....

Do you use the xfire bridge, or software-only?

Morten

I think my problem is that this mobo is Nvidia 790i :-(

Mine are ASUS P7P55D.

Do you use the xfire bridge, or software-only?

They are physically connected.

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