CUDA init failure

[bmekler]

Running a system with four GTX Titan cards and a Radeon HD6450 (PCIe x1) for display, Windows 7 x64 SP1, latest NVidia and AMD drivers. Problem: if the display attached to the Radeon card is set as the primary display at the time of Octane Render startup (demo v1.10), starting a render throws a message that all four GPUs are faulty. If the display attached to one of the GTX Titan cards is set as primary, then everything works fine. Interestingly, on the previous system that I put together for Octane, using four GTX690 cards plus one Radeon HD6450, I did not encounter this problem.

Is there anything that can be done, or should I simply replace the Radeon with an NVidia PCIe x1 card (such as a Quadro NVS 290) for display output?

Edit: Never mind, downgraded NVidia driver from 320.18 to 314.22 and now it works fine. Getting ~28Ms/sec using demo and the benchmark scene, somewhat better than 4xGTX690, and ~20C cooler too.