Most PSUs will be "compatible" as far as cables are concerned. However, for a proper recommendation, you should list system specs. For all I know you could be running 30 hard drives off it
General recommendation:
[strike]CX 430 for bare minimum. (430W)[/strike] Sorry, was thinking of the R9 270. My mistake. Thanks Chris987!
XFX 550W or EVGA 600B for some headroom for some CPU and GPU OCing
XFX 750W for Crossfire, efficiency