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 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 : ForumHow to calculate max PSU output? ForumHow would one calculate total amp rating on Dual +12V rails? ForumAti radeon 6770 psu requirements help ForumWhy my psu max load (wattage) shows different than i have calculate on the label ForumPsu for 6870 cf: did I mess up?? ForumPsu calculator says 297 watts for whole pc but .. .. .. ForumDid i setup my raid 0 correctly ? ForumHow To Calculate Graphics Card Needed? Forum5770 & 5750 Real power& Requirements ForumPlease help me calculate power requirement ForumHow to calculate minimum power supply size ForumWhy do PSU calculator lie? Help! ForumHow to calculate total current(A) of a PSU for a GPU ForumTrying to understand my PSU requirements ForumHow do i calculate the cash im spending with a 24\day pc turned on? ForumGaming laptop help Forum[Solved] First Build: Case? PSU? Forum[Solved] Recommended PSU for a GTX 460 ForumRecommended PSU for Two HD 5970's in CrossfireX? ForumQuestion about Corsair PSU More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !