What psu to use Tags: New Build Systems Last response: April 9, 2012 11:00 AM in Systems Share marcd2011 April 9, 2012 9:26:27 AM Hello, Im building a new pc for gaming Ive got a few parts already but i dont no what size psu to use. Ive already got; Amd phenom ii x6 1045t Msi 970a-g46 8gb (4x2gb) pny optima ddr3 ram 1tb hdd 2 dvd-rw About 5 fan in an xclio a380 case Xfx radeon hd 6870 1gb 32'' full hd tv I am getting another 6870 and crossfiring the pair @ x8x8 bandwidth Ill be using it for gaming mainly I will be planning on overclocking cpu and gpu when ive bought aftermarket coolers my question is what size psu should i buy (minimum) So i have a general idea of what to get Thanks alot Marc More about : psu jsc April 9, 2012 10:52:12 AM A pair of 6870's will pull about 20 amps, peaking to 25 amps. The minimum power supply I would use is a good 750 watt PSU: Corsair TX750V2 or XFX750, both with about 60 amps on the 12 volt rail and both built by Seasonic. You do not really need a modular power supply because you will not have that many unused cables. marcd2011 April 9, 2012 11:00:52 AM Spot on thats fine, i looked at an xfx 750 for £70, But i wasnt sure if was ok with it only having a single 12volt rail Can't find your answer ? Ask ! Publish Related resources: ForumWhat PSU to use ? ForumWhat psu to use with 670 sli ForumWhat PSU to use ForumWhat psu should I use ForumWhat PSU Should I Use ? ForumWhat psu should i use with the Sabertooth x58 & i7 965 ForumHelp! What PSU should I use for my Nvidia Geforce Gtx 550 Ti 1Gb? ForumWhat PSU can I use ? ForumWhat size PSU should I use for this build? ForumWhat PSU should I use for my build? ForumWhat PSU to use for my new build? ForumWhat PSU Calculator do you use ? ForumWhat PSU should i use ? ForumWhat is the minimum psu I should use for this build? ForumNew Build, any good? ForumNot sure what my problem is ForumI dont knw what is my pc sound drive name ForumWhat to upgrade next? ForumWhat is my old rig worth? ForumWhat is ata storage controller?? More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !