per jessen ueecomputerorg aaron kulkis wrote per jessen wrote aaron kulkis wrote power supplies generally rated much power consume much supply relatively direct connection two matter yes 80 efficient 400w power supply rated supply 400w power consuming 500w rated consume 400w power supplying 320 w yes matter 400w devices needs 500w power supply think meant matter wrt subject per jessen zürich wed 06 aug 2008 014820 0100 opensuse power supply psu efficiency