I noticed that after installing the 280.19 BETA driver that my GPU voltage was increased from 1.075 to 1.088. Dislosure: My cards are flashed to 850 core and 2050 on the memory at 1.075. I reflashed the cards and still Afterburner, AIDA64 and GPU-Z registered the increase in GPU vcore. I uninstalled the driver and reverted back to 275.33 and vcore was restored back to 1.075. As a test I flashed both GPU's to the same clocks at 1.063. Reinstalled the 280.19 BETA and after a reboot, by golly the GPU vcore was increased to 1.075. Has Nvidia inserted a core voltage offset in the driver for the GTX580 based on reports of a small increase solving the issue for many having crashing in DX11 environments such as Crysis 2?