Can't quite figure this out. Installed Win7 HP 64-bit. Installed NV 286.xx driver. Then installed BOINC client. Attached to PrimeGrid, figured it would use all four GPUs I have in this box. But it only started two GPU tasks, on "device 0" and "device 1". And two more CPU-only tasks. (Dual-core AMD CPU.) Anyone know how to configure BOINC and PrimeGrid to utilize four 9600GSO GPUs? Do I need to extend my Windows desktop to these other GPUs, like I used to have to in Folding@Home on XP? When I went to the Screen Resolution properties, it shows my primary display (DVI-to-VGA), and then it shows four additional non-connected displays. Under XP, it showed my primary display, and three other displays that I had to extend my desktop onto. Why is Win7 showing FIVE displays total. I don't get that. Edit: I close BOINC, extended my desktop to VGA, so that I had 8 displays showing. I then re-started BOINC. Still only two GPU tasks. I tried editing the client_config.xml file, with cuda_devs to 4 instead of 2, but it just re-writes it when I start the client back to 2. I found this, and it references a cc_config.xml file, which is not present in the newest BOINC client that I installed. Unless, I have to create that file. http://boincfaq.mundayweb.com/index.php?language=1&view=471 Code: <cc_config> <options> <use_all_gpus>1</use_all_gpus> </options> </cc_config> I also tried reverting back a few drivers, from 286.xx to 280.26. Still no dice. All four 9600GSOs are showing up under the Computer's Properties, under Devices and Printers, under Control Panel.