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 SolvedWhat cable sleeves should i use for my psu? Forum SolvedWhat PSU do I use for my rig? Forum SolvedWhat PSU should I use on my build?(how many watts and what brand) Forum SolvedWhat PSU to use? Forum SolvedPls help, need to know what psu to use!!? Forum SolvedWhat PSU should I use? Forum SolvedAre these parts compatible with each and other and what psu should I use Forum SolvedGTX 660 SLI What PSU should i use? Forum SolvedWhat PSU should I use? Forum Solvedwhat psu to use for dell studio desktop (stock) upgrade with geforce gtx 760 card Forum SolvedWhat PSU can i use for an Asus M5A97 LE R2.0? Forum SolvedWhat PSU should I use? Forum SolvedWhich Cooling to use, Liquid or Water ? And What PSU ? Forum SolvedWhat PSU to use? Forum SolvedWhat PSU should I use? Forum SolvedWhat PSU to use on my rig Forum SolvedNeed help deciding what PSU to use... Forum SolvedWhat PSU should i use for my build Forum SolvedWhat Sort of PSU Should I Use? Forum SolvedWhat Watt PSU Should I Use? Forum More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !