Sometimes, if I close GPU-Z then put my computer into standby (Sleep) mode for the night, then power it back on (Resume) in the morning, then quickly run GPU-Z, I get a BSOD. Usually, I don't ever do this - I either keep the computer on at night, or turn it fully off. So, even though I have been using this new videocard since September, I only report this BSOD now. Specs: Intel chipset motherboard + Intel Core i7 CPU. Videocard Nvidia GeForce GTX 670 (with 2 GB videoRAM) with WHQL 310.90 drivers. (Intel GPU disabled in BIOS) Windows 7 64-bit, SP1, Ultimate with all updates installed. rest of system specs -- see my System Specs in my forum profile. Latest BSOD error code: 0x000000C5 I am not sure if the previous BSOD had the same error. Something strange about the BSOD - the text was too large to fit, and I was unable to see the whole of it, because the first 3-4 lines were scrolled up (out of the display) quickly. And I think part of the BSOD text mentioned "signed/authenticated drivers" (??). Any ideas on this? Has this been reported for similar videocards before? NOTE: No BSOD when powering on the PC after being fully off and then running GPU-Z - only get a BSOD on powering on after standby/sleep. Usually and mostly no BSOD if the sleep period was brief - it seems it takes some minutes (hours?) of system Sleep for GPU-Z to cause a BSOD after Resuming. If I don't put the system to sleep, I get BSODs very rarely - maybe once per 2-3 months.