Like Kefan77 says, we need more info. What cpu, is it overclocked? Will the card be overclocked? The CX range are poor quality budget psu's and depending on which version of the CX600 you have may have as little as 480w on the 12v rail which is just pathetic for a so called 600w psu. The newer version has 552w on the 12v rail but it's still a poor quality psu with cheap internals.