I have 650Watt PSU, do not feel like bottlenecking honestly to say... I consider upgrade of PSU once I get another card. Now I invested in better case with better airflow and cooling Evolve F125(got really bad case atm some eurocase something, the card almost did not fit in). Planning upgrade of CPU or movin to Intel but not anytime soon. Had GTX960 and the perfomance is really much better with the R9 290 honestly to say.