Is my 750w Power Supply too small?

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MattTek

Honorable
Dec 2, 2013
12
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10,510
I bought a Rosewill Capstone 750W for my build. Sounded kind of small but according to the wattage calculator on PCPartPicker.com I would use max ~670w. Upon reading in the manual >1000w PSU is recommended for SLI, I used the ASUS PSU calculator and sure enough it recommends 1050w for my build. So.. is 750w too small? is there a way to specifically calculate the amount of power I'll be using myself? Help!

My Build...
PC Part Picker: http://pcpartpicker.com/p/2iq6a

Case: Fractal Design Define XL R2
Power Supply: Rosewill Capstone 750W
Motherboard: Asus Maximus VI Hero ATX LGA1150 Motherboard
CPU: Intel Core i7-4770K 3.5GHz
Thermal Paste: IC Diamond 24 Carat
CPU Cooler: Cooler Master Hyper 212 EVO
Primary HDD: Samsung 840 EVO 120GB
Secondary HDD: Western Digital Caviar Black 1TB 3.5" 7200RPM
RAM: Corsair Vengeance 16GB (2 x 8GB) DDR3-1600 Memory
Video Cards: 2X EVGA SuperClocked GeForce GTX 770 2GB Video Card SLI Configuration
Wireless: Asus PCE-AC68 802.11a/b/g/n/ac PCI-Express
Optical Drive: Asus BW-16D1HT Blu-Ray/DVD/CD Writer
 
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Cons29

Splendid
Feb 10, 2010
5,456
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while i may be wrong here, but i will just share what i know.
a typical rig usually takes 300-400w (that is with a good psu already), doing sli, as far as i know having 750-800 is enough. i think 1000w is not accurate.
(again i can be way wrong here) the pci-e gives 75w, then additional 75w (x2) for the extra 6pins (not sure for the 8pin). so with 300-400w, plus additional ~200w, that's like ~600w.
of course i would not recomment using the full capacity of your psu. but having 750w (i have seasonic 760w) is enough for sli, if i was to build one.
of course we are not talking about some titan sli here.

please someone correct me if im wrong
 
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Tavo_Nova

Tavo_Nova

Distinguished
Dec 31, 2011
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19,360
actually for pretty much any card with sli/xfire 760w-860w is fine. unless you're crazy with all those bling bling and oc the bejesus out of your sexy rig then maybe no. but overall 760w is pretty decent. I mean I doubt your rig woulg go 100% cpu and 100% gpu 24/7
 
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MattTek

Honorable
Dec 2, 2013
12
0
10,510
The computer has been running fine since build, no problems with the power supply whatsoever. Thank you all for the helpful input, just replying to verify to others who may be in a similar situation.

PS... SLI rocks!
 
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