I reformatted my computer with a fresh version of Windows 8.1 after I got my new 290. I have a 1 hour prime stable overclock on my 2500k at 4.6 I have always used CPUID HwMonitor, CPU-z, and OCCT. All of those programs have sensors that read off temps and what not. Occasionally, enough to make me post, those programs will just not start up. HWMonitor will just say "not responding. CPU-z will just stop at "software" on the loading menu and for the first time tonight OCCT didn't start up and did something similar to what HWMonitor did. After I reboot the pc, they seem to always work fine. I've been using windows 8.1 for about 6-8 months now and have never had this problem before, albeit, this is really the first time I've been tinkering with my overclock and these types of programs. I'm current'y 23 minutes into a OCCT 1 hr session and it seems rock solid stable. I know some of you might not think an hour of stability isn't completely 100% stable, but I think it's stable enough to not cause the problems at hand. Any input would be appreciated. Oh, and I've googled with very very little luck. Thanks.