My power draw figures are DC (actual power consumed) not the power at the wall which is AC. AC are always higher.

Idle 790FX 10W DC (12.5 VAC) is about right IMO. Yep, I tried with X2 BE in there as well to verify. Same results.

When I tested with and without GPU (idle) on a system with known power consumption without GPU, the Sapphire HD 2600 XT added 10W DC (12.5 VAC) to the idle. GPU max load it added 50W DC (62.5 VAC).