The Silencer Mk III 850W power supply provides 12V power via a single rail design rated for 70A or 840W. Both of the minor rails are rated for 24A each with a combined maximum output of 120W for the 3.3V and 5V rails. This left us scratching our heads a little bit as even the Silencer Mk III 600W had stronger minor rails, but it should still be plenty of power. The 5VSB rail is rated for 3A or 15W. Maximum combined output for the Silencer Mk III 850W is 850W.
PC Power & Cooling Silencer Mk III 850-Watt Power Supply Review at TweakTown