11-22-2013, 11:48 AM
Negative, booting with UEFI made no difference. If I used the onboard VGA as primary output but without the driver installed (using Windows built-in Standard VGA Graphics Adapter driver), all eight cards show up in device manager, but they don't actually work - no CUDA devices are available. Fortunately, Linux support was recently added to Octane Render plugin for Maya, and right now I'm reconfiguring the system with Ubuntu 12.04, which seems to be running eight cards fine, aside from no access to overclocking.