i bought an evga gtx 550 ti sc 3 days ago. replaced my old radeon hd 4670. so i uninstalled the amd drivers normally (control panel) and installed lastest nvidia drivers (301.42). everything was fine, it played games pretty good. using evga precision x to control fan speed. no overheating issues (always watching temp), have good airflow, good cable management, not many dust in the case. not so much hardcore gaming these 3 days. so today i was playing crysis 2 (less than an hour playing it) at high settings at 1080p (45-60 fps constant) and suddenly the fps dropped to 4-8. the temp was around 63C (which i think is normal under load). i thought it was the game or something, so i lowered the resolution but i still had the issue. exit game, then open another game, same issue choppy and laggy 4-8 fps. temps are still good. so i opened evga presicion x and i noticed that the gpu clock went from 400 mhz (i believe) down to 66 mhz and the voltage went from 965mv (or something like that) to 1125mv. i didnt had any issue before like glitches, bsod, black screens, no response or anything else. i havent restarted yet the pc, cause my hd 4670 got artifacts and the first thing i did was restart and it never booted again. i hope this has a solution, thanks.
edit: forgot to mention that i havent messed with any setting or tried to overclock cause i dont know anything about it...
AMD Athlon II X2 265 3.30 GHz G.Skill ECO DDR3-1333 2x2GB
WD Caviar Black 500GB AALS
Windows 7 Ultimate 64-bit
EVGA GTX 550 Ti SC 1GB GDDR5 Ultra LSP 550w PSU
<message edited by NeftyPR on Saturday, July 07, 2012 4:24 PM>