well idk, at idle, (monitor off kinda idle), my draw is about 40W, while I am typing this, it's around 70W. Motherboards use a lot of power compared to CPU on idle. More complex the motherboard is, the more power it draws. I have a single HDD, no audio card, no nothing really, just graphics card, 4 memory sticks and that's it. I don't even h ave DVD in (took it out one day, never bothered to put it back in ) Anyway, motherboards can draw anywhere form 20 up to 100 watts so it's kinda of a big deal if you are on lower power PSU. I used to have chieftec CFT 750W modular but it died on me couple of months out of warranty and a new similar one is around 100$ and I am not willing to invest that into something that is making almost no impact over a sufficient PSU and is gonna die on me sooner than a hard drive. If this 530W dies - I don't care, it is 45$ with 5 year warranty, it can die all it wants.