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Need help choosing PSU for a build

Okay, so here is my build so far. I probably wont ever full upgrade the RAM to 64GB, use all 8 case fans, or use 3 GPUs, but I would like to know how many watts I would need if I ever decided to do so. I'm confused by all the online calculators I've tried. They seem terribly inconstant, hitting anywhere between ~770 to ~1100. Right now I'm looking at a Thermaltake TR2 RX 750W. Let me know if I left anything out... Thanks! ^_^

Mobo:
1x ASUS Sabertooth X79 (LGA 2011)

CPU:
1x Intel Core i7-3820 Sandy Bridge-E 3.6GHz

CPU Heatsink:
1x COOLER MASTER Hyper 212 EVO

GPU:
3x XFX Radeon HD 7870 (Crossfired)

RAM:
8x DDR3's (I'll probably be running 1600's)

Drives:
1x DVD-RW/DVD+RW Drive
2x 320GB Hard Drives

Fans: (Case supports 8)
1x 120mm
7x 140mm
14 answers Last reply Best Answer
More about need choosing build
  1. This would be a better choice, and the price after rebate is good: pc power and cooling 750w for $90 after rebate at newegg (link broken).
  2. I would like to go modular/fully modular if possible to keep it less junky and to have better airflow.
  3. Awesome. So do you guys think 750/850 watts will be enough to power that build at full load?
  4. I take it you used this calculator http://extreme.outervision.com/PSUEngine It says minimum 720watts for 90% load case and recommends 770watts. It is considered fairly accurate and based on those results I would say min 850watt for overclock and/or any stress testing you might do.
  5. Okay, cool. You guys are a lot of help. The calculator on newegg.com said something like 1100 watts, haha. That's what confused me, I think...
  6. TheButtaSauce said:
    Okay, cool. You guys are a lot of help. The calculator on newegg.com said something like 1100 watts, haha. That's what confused me, I think...

    That is because they are a vendor and do not want any liability and they have to cover themselves for all the cheap crappy 1100watt units that they sell from not so respectable manufacturers who exaggerate the output of their PSU's.
  7. Yeah, I figured it was something along those lines.

    Anyone have any recommendations that are 850+ watts, modular/full modular, and Crossfire ready?
  8. Best answer
    TheButtaSauce said:

    GPU:
    3x XFX Radeon HD 7870 (Crossfired)

    You're going to need 6 pcie connector's
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817116012
  9. You could step up to this 1000watt OCZ ZX as well for those connectors http://www.newegg.com/Product/Product.aspx?Item=N82E16817341045
  10. Best answer selected by TheButtaSauce.
  11. I think I'll go with the CORSAIR Professional Series HX850 delluser1 suggested. Thanks everyone for all your help!
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