You're actually looking at closer to 320W at stock speeds. But regardless, even with a moderate overclock you'll be okay with the 600W from corsair. The issue is just how long will it last? Their lower end power supplies use very stock parts from china and taiwan. They're not geared for serious overclocking. It's just a judgement call. You'll probably be fine, but I wouldn't personally ever use a CX/CM/GS etc corsair series for overclocking beyond something very mild