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How big of a power supply do I need?

I am planning on building a computer, and the power supply I picked out is a 650 watt power supply from corsair. I have my parts listed below. Do you think that I need a bigger supply? If I do, what would you recommend? NOTE: I plan on water cooling eventually

 

mobo: asrock 990FX fatal1ty

cpu: AMD FX-6300 Vishera

gpu: Nivida Geforce GTX 660 x 2 SLI 

ram: 2 x 4gb DDR3

hdd: 1tb 7200rpm x 1

ssd: samsung 250gb 840 evo x 1

optical drive: 1

 

Thanks ;P

 

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i would recommend a 750 watts (EVGA g2 750)

The BBQ: i7-4770 / 212x / Tri-X R9 290x 1075/1400 / MSI H87-G43 GAMING / EVGA G2 850W / Corsair Spec 03 / Samsung 840 EVO 250gb SSD / Toshiba 2TB HDD / 8gb Kingston DDR3 1600mhz

Peripherals: G710+ / G502 / Bose Companion 2 Series III / Audio Technica ATH-M40x / Sound Magic E50

Monitors: Dell U2414H 

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get the EVGA 750W G2 series or the 850W

"Sulit" (adj.) something that is worth it

i7 8700K 4.8Ghz delidded / Corsair H100i V2 / Asus Strix Z370-F / G.Skill Trident Z RGB 16GB 3200 / EVGA GTX 1080Ti FTW3 / ASUS ROG SWIFT PG279Q

Samsung 850 EVO 500GB & 250GB - Crucial MX300 M.2 525GB / Fractal Design Define S / Corsair K70 MX Reds / Logitech G502 / Beyerdynamic DT770 250Ohm

SMSL SD793II AMP/DAC - Schiit Magni 3 / PCPP

Old Rig

i5 2500k 4.5Ghz | Gigabyte Z68XP-UD3P | Zotac GTX 980 AMP! Extreme | Crucial Ballistix Tactical 16GB 1866MHz

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A 650W PSU should do fine. However, the EVGA 750w G2 is a good choice for when you change out components. 

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...just redo the whole build

 

why would be do that, this build is fine for gaming....

 

edit: does op have parts yet or wot?

4690K // 212 EVO // Z97-PRO // Vengeance 16GB // GTX 770 GTX 970 // MX100 128GB // Toshiba 1TB // Air 540 // HX650

Logitech G502 RGB // Corsair K65 RGB (MX Red)

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Thanks everyone for responding... I'm going to pick the EVGA 750W G2 psu

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Good website here: http://www.extreme.outervision.com/psucalculatorlite.jsp

Or you could use: http://www.coolermaster.outervision.com/<---------- This is more user friendly 

CPU: i5 4670k @ 3.4GHz + Corsair H100i      GPU: Gigabyte GTX 680 SOC (+215 Core|+162 Mem)     SSD: Kingston V300 240GB (OS)      Headset: Logitech G930 

Case: Cosair Vengance C70 (white)                RAM: 16GB TeamGroup Elite Black DDR3 1600MHz       HDD: 1TB WD Blue                              Mouse: Logitech G602

OS: Windows 7 Home Premium                       PSUXFX Core Edition 750w                                                Motherboard: MSI Z97-G45               Keyboard: Logitech G510

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