Help with power supply? ($100 limit)

[fisz]

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3450 3.1GHz Quad-Core Processor ($179.99 @ Memory Express)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($37.27 @ DirectCanada)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.79 @ DirectCanada)
Video Card: Sapphire Radeon HD 7850 1GB Video Card ($179.99 @ Newegg Canada)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($54.69 @ DirectCanada)
Power Supply: Corsair Enthusiast 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($109.99 @ Newegg Canada)
Monitor: BenQ GW2250 21.5" Monitor ($109.99 @ NCIX)
Total: $741.71
(Prices include shipping, taxes, and discounts when available.)

This is my build, but im not sure on which power supply to pick. I don't know much about them, so can anyone help me out? ($100 limit)

 

[abekl]

The one you have selected, the Corsair Enthusiast 650w is a superb PSU. Go with that.

 

[mocchan]

^ +1

 

[fisz]

one sec, I found a 750w: http://www.ncix.com/products/?sku=58382&promoid=1258
which is cheaper than the current 650w, I guess i'll get the 750w then

 

[mocchan]

I wouldn't really recommend it from an efficiency standpoint. You get optimal efficiency from a PSU when it's drawing 20%-60% power. Getting a 750w PSU would bring you way below this range.

 

[fisz]

I wouldn't really recommend it from an efficiency standpoint. You get optimal efficiency from a PSU when it's drawing 20%-60% power. Getting a 750w PSU would bring you way below this range.

So if I get the 750, will my computer not run as good?

 

[mocchan]

PSU won't effect how your computer runs, but it may effect your power bill by a small margin

Also, on a side note, you won't even need 750w of power even if you were to decide to Crossfire your HD7850's (in all honesty, 550w would probably do that just fine). I would only recommend a 750w PSU if someone were to looking to Crossfire GTX670's or something similar, just something to keep in mind.

 

[fisz]

Best answer selected by fisz.