yup, but need lot of airflow to keep em cool, i went up to 750. i do not go up 650 anymore. running very stable. i only use GS hub and GS powerboard. All GS  (waiting for the moment Sidehack is going to make an PS  )\

Got 1 amazing stick that is running 160-170 Ghs @ 650 Mhz out of the box. The rest are doing approx 130-150 @650.