2 days ago I was running my win XP pro SP3 with both my 8800's crunching away no problem.

I have since upgraded the system to Vista 64 bit.

No matter what I try im still only getting 1 GPU Crunching.

Ive installed BOINC 6.3.10 for 64 bit.
I installed the CUDA drivers
I have Un SLI'ed the cards.

and it still just runs one.

Any insite? Ideas?

2 days ago I was running my win XP pro SP3 with both my 8800's crunching away no problem.

I have since upgraded the system to Vista 64 bit.

No matter what I try im still only getting 1 GPU Crunching.

I believe Vista requires that both video cards be hooked up to a monitor or "tricked" into thinking they are. I am not sure of the thread, but there is one that details how to create a "fake" monitor using a DVI->VGA adapter.

http://www.gpugrid.net/forum_thread.php?id=399

have you extended the desktop onto the second card?

Thanks! that thread got me going, Just had to hook up another monitor and reboot and it fired right up. strange things this vista does

Keep in mind that if You don't leave the 2nd monitor hooked up when You reboot--You'll have the same problem again. If you don't need a 2nd monitor hooked all the time--that's the benefit of the vga/dvi dummy.....