Looking for high efficiency power solutions at an entry level price for your proliant gen9 essential server hpe entry level power supplies offer an optimized set of features with options for both redundant and non redundant power configurations the hpe 550w fio power supply offers silver certified 80 plus power efficiency up to 89 with an optimized set of features for non redundant power configurations the hpe 900w gold redundant ac power input module with power backplane can be configured t