GTX470 is freeking out

does anyone know why my gtx470 would be freaking out with artifacts all over the screen and shutting down. this started happening about two weeks ago
i have to under clock it as far as it will go with evga precision to get it to work and i can even play games with it under clocked but if i reset it to factory settings it starts to freakout again, i have tried changing drivers have tried
275 280 285 295 all fail with in few sec (driver has failed and has recovered)
dont know what to do next cards only about two or three yrs old is it just going bad or what? oh and temps never go above 50c im on water cpu,gpu1,gpu2,NB,
SB,and RAM so i dont think its heat.

Probably bad VRM, or driver issue. What are your system specs?

Call Evga and they should replace it without a hassle. Sounds like something has borked on the card.

the specs are as follows
EVGA 780i sli mobo, Intel Q6600, gtx470 graphics, gtx260 physics, 6GB OCZ gold 800mhz ddr2, OCZ black 32GB SSD OS, Kingston now 128GB SSD game drive, Hitachi 500GB hdd storage Seagate green 1.5tb storage, RaidMax 850w
gold psu, 2x mcp 350 pumps, 6xwater blocks, 1-120x3 radiator , 1-120x1 radiator, 2x res, LG blu ray drive, 7x 120mm fans, 2x 80mm fans, fan monitor gate keeper II, lampton 8way inverter, 7x12" ccfl bulbs

thanks the only reason i would be hesitant to rma is i water cool so i don't have
the heat sinks anymore.

sorry about the quality of the picks its a phone

these mite be a little clearer i hope added more light

Always keep the stock HS/F so if you need to RMA, you can replace the HS/F back on. it sounds like a Voltage regulator could be going, But it's hard to tell, it could also be the PSU , only real way to test is to realy diagnose it.