Wow, I literally just went through all 196 pages of this thread, but I did pick up some useful information on overclocking GPUs....
I'm running the Gaming Edition MSI 760 (since it perfectly matches my Z87-GD65 Gaming mobo), and am waiting on my 2nd 760 to arrive.
I've been messing with the settings in Afterburner and I can get settings that are perfectly stable in Furmark (using the settings on the 1st page of this thread) and am having an issue with figuring out what the relationship between the Core Voltage, Power Limit, and Core/Memory Clock settings is. So far, I've pretty much been semi-randomly messing with settings and testing.
The issue is that I can find settings that are stable through Furmark, but utterly fail when I try to run Valley. Since there's no sort of error message that pops up, I'm having a hard time figuring out what needs to be changed and when.
Sorry for the semi-lengthy first post. To make up for it, here are a couple of pics to look at: