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Need help choosing PSU for a build

Last response: in Components
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June 12, 2012 11:04:38 PM

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

More about : choosing psu build

a b ) Power supply
June 12, 2012 11:06:28 PM

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).
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June 12, 2012 11:11:30 PM

I would like to go modular/fully modular if possible to keep it less junky and to have better airflow.
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June 12, 2012 11:22:44 PM

Awesome. So do you guys think 750/850 watts will be enough to power that build at full load?
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a c 713 ) Power supply
June 12, 2012 11:26:46 PM

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.
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June 12, 2012 11:28:51 PM

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...
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a c 713 ) Power supply
June 12, 2012 11:32:49 PM

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.
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June 12, 2012 11:35:56 PM

Yeah, I figured it was something along those lines.

Anyone have any recommendations that are 850+ watts, modular/full modular, and Crossfire ready?
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Best solution

a c 243 ) Power supply
June 12, 2012 11:40:13 PM

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=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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June 13, 2012 1:03:49 AM

Best answer selected by TheButtaSauce.
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June 13, 2012 1:04:43 AM

I think I'll go with the CORSAIR Professional Series HX850 delluser1 suggested. Thanks everyone for all your help!
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