Solved Did I calculate my PSU requirements correctly? Tags: Power Supplies Components Last response: August 7, 2010 7:15 PM in Components Share logoman August 7, 2010 6:33:36 PM I have a 3 yr old 550 Watt PSU that I want to use with my new components: mobo: MB MSI| 890GXM-G65 RT cpu: CPU AMD|PH II X6 1055T 2.8 G AM3 RT vidcard: ATI Radeon 5770 ram: DDR3 4gb (2gb x 2) cd/dvd burner: 1x HDDs: samsung 1TB 7200rpm + another smaller HD fans: 2 case cooling fans (110mm, 80mm) I figure I'll need ~450 watts (the vidcard seems most demanding, minimum they rec 450) More about : calculate psu requirements correctly Best solution jsc a c 144 ) Power supply August 7, 2010 6:52:05 PM Share Well, let's see. I figure (some figures rounded slightly): CPU - 10 amps @ 12 volts = 120 watts GPU - 7 amps @ 12 volts = 84 watts MB - 5 amps @ 5 volts = 25 watts Memory - 8 amps @ 3.3 volts = 25 watts 2 HD's and an optical - 3 amps @ 12 volts and 3 amps @ 5 volts = 50 watts 2 fans - less than 1 amp @ 12 volts = 6 watts. I get about 310 watts. Try some of the PSU calculators. logoman August 7, 2010 7:15:02 PM Best answer selected by logoman. Can't find your answer ? Ask ! Publish Related resources How to calculate max PSU output? Forum How would one calculate total amp rating on Dual +12V rails? Forum Ati radeon 6770 psu requirements help Forum Why my psu max load (wattage) shows different than i have calculate on the label Forum Psu for 6870 cf: did I mess up?? Forum Psu calculator says 297 watts for whole pc but .. .. .. Forum Did i setup my raid 0 correctly ? Forum How To Calculate Graphics Card Needed? Forum 5770 & 5750 Real power& Requirements Forum Please help me calculate power requirement Forum How to calculate minimum power supply size Forum Why do PSU calculator lie? Help! Forum How to calculate total current(A) of a PSU for a GPU Forum Trying to understand my PSU requirements Forum How do i calculate the cash im spending with a 24\day pc turned on? Forum Gaming laptop help Forum [Solved] First Build: Case? PSU? Forum [Solved] Recommended PSU for a GTX 460 Forum Recommended PSU for Two HD 5970's in CrossfireX? Forum Question about Corsair PSU Forum More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !