Posted 27 January 2009 - 01:33 PM
Going by my Kill-A-Watt, my system (E6750 at 3.6, 4gigs RAM, 2 HDs, 4 DVD drives, ATI 4870) fully loaded (Furmark and Super Pi running at the same time, GPU+CPU at 100%), shows to pull 380 watts at the plug, or 320 actual Watts figuring 84% PSU efficiency at that load. Besides illustrating my ability to construct run-on sentences, it illustrates that the power requirements from the manufacturers, as well as the "power calculators" online are overly cautious, which is better than being caught short.
A Q6600 is rated at 95watts, figure up to 140 watts if overclocked/overvolted. That 9800 GTX pulls ,from what I can find, about 155watts loaded. Hard drives as far as I can tell, may use 2 watts each, at least mine do when using HD tach or defragging. Worst case, you might be looking at 320 watts at full load with everything pegged. The question, is your 12V rail of your current power supply enough to run everything? If you have a weak 12V rail that will be running nearly pegged all the time, you are asking for trouble. I dont feel comfortable running a PSU, even a good one, at >80% rated output for an extended period.
I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)
3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)