yeah thats a good quality power supply, with enough watts, you are good to go!
It's not Haswell compatible \ ready , but the sleep states can be disabled in the BIOS.
MILD overclocking would be fine.
QUALITY IS GOOD.
should i then get Seasonic M12II-620 EVO Edition (80Plus Bronze) its fully modular and it costs 29€ more. would that be worth to buy ? if i wanna oc my cpu more