So I'm hoping that someone in here could explain to why the following happens. I think I have an idea, but it's probably wrong...
In March I bought a GalaxyTech GTX580. It worked fine for about a month and a half, then it started artifacting like crazy. Called them up, got an RMA. New card worked fine for a month, then started doing the same thing. Got another replacement. Yesterday that replacement started doing the same thing.
Now, after that many, one would think that it could be something in my system. However, I have a new power supply, I've added a beefy UPS to handle any power spikes or outages, etc. I've been doing system builds for 14 years and had never had to RMA a product until now, so even I was starting to think it wasn't so much the card but something in my system doing it.
I did some searching and found that it was happening to people that have other brands of cards, but the same chipset. All operate their PC the same as I do, which is turned on 24/7. Their solution? A cold boot. Cold booting is something I rarely do anymore, so all those times it never occurred to me to try it. I was certain it wouldn't work, but lo and behold, it fixed it. Derp on my part for not trying that before. My cycle was reboot, uninstall drivers, reboot into safe mode, install new drivers, DAMNIT DOESN'T WORK, and throw in my old 4890.
The actual common thing here is that every time it has happened was after Windows did one of it's automatic updates and I woke up to the login screen. Now, one theory on this issue is that the card doesn't get reinitialized from low power usage mode correctly, which is why a cold boot is the only way to fix it. I'm kind of wondering if the win7 login screen goes into a low power mode after a set amount of time, which would explain why this has happened after updates are automatically installed.