the 1st of these card that I order cause bad artifact before either crash the driver , cause a sudden reboot or a black screen system lockup . this would happen at seemingly random time while play 3d game -lrb- Skyrim and Guild war 2 -rrb- . I rma would it back to Amazon , who send I a replacement card . I will say at this point that I be very impressed with Amazon 's RMA service . Express ship I a replacement before I return the original card and then reimburse I in full for the return shipping . thumb up . unfortunately , the replacement card be also a lemon . it would lock up my system just as frequently as the 1st card , and it be almost always a black screen lockup that need a hard reset to get out of . test with furmark , it would crash within a couple of minute . I try different driver version , move it to a different pci-e slot , reduce the pci-e speed on my motherboard from 3.0 to 2.0 , update to the latest firmware , but none of that make any difference . I have return this 2nd card to Amazon and ask for a refund as I can not keep ship card back and forth until I get a good one . it do make I wonder if there be a problem with my system , since I think the chance of get 2 bad card in a row be pretty slim , but I be now sure that there be not . my previous card -lrb- 560tus -rrb- have be rock solid on this system . and I just pick up a galaxy gtx670 sc a few day ago , which have so far be work perfectly on this system . this pretty much confirm that my system be fine and there be no compatibility issue between it and the GTX670 chip . very disappointed and frustrated with this evga card ... either I have extremely bad luck to get 2 lemon in a row , or there be some serious quality control issue here .