Help with a PSU choice

[hvcrios]

Hello, how is everyone doing?

I'm on a bit of a pickle here, I recently bought all the parts for a new build (hadn't built a PC in a while), the specs are as follows:

- core I5 3570K (I want to OC it to at least 4.5Ghz)
- Asus P8Z77-V Deluxe
- 2x 4GB Corsair Vengeance 1866Mhz
- EVGA gtx 680
- 2x Samsung HD502HJ 7200RPM sata 2 500GB HDDs (raid 0)
- 1x DVD+-RW drive
- cooler Zalman CNPS 10X Extreme
- Cooler master HAF 932 New Edition chassis (1x 250mm, 2x 200mm and 1x 140mm blue led fans, I think )
- Corsair ATX 650W CMPSU-650TXV2

Now the problematic factor here is the PSU as stated on the tittle, just after all the components were here I started thinking that maybe 650W is not enough, I'm getting mixed results form online PSU calculators, plus I really wanted to mess about with the GFX card OC possibilities as well.

The thing is that I really wish I could build it already instead of waiting a whole other week it would take to exchange this 650W PSU for 750W one.

So what do you guys think? do I really need a PSU greater than 650W or is it fine?

 

[Outlander_04]

http://www.realhardtechx.com/index_archivos/Page362.htm

 

[hvcrios]

http://www.realhardtechx.com/index_archivos/Page362.htm

Yeah well, that's what it says on the box anyway, I'm only afraid it doesn't take into account overclocking and such, bah whatever I guess I'll just trade in the 650W for a 750W to be safe, I waited a long time to build a new PC, one more week won't kill me

 

[capt_taco]

Don't waste your money. You will be more than OK with the 650W unit. Your whole system should use less than 500W. Some examples:

http://www.legitreviews.com/article/1891/12/
http://www.fudzilla.com/home/item/26768-gainward-gtx-680-phantom-2gb-tested/26768-gainward-gtx-680-phantom-2gb-tested?start=11

For a more specific answer, you can also plug all your components into this calculator, which gives similar results:
http://extreme.outervision.com/PSUEngine

Bottom line, the "recommended" power supply that the video card manufacturer gives you is ALWAYS going to be well above what you actually need. Usually by a couple hundred watts. They do this to cover their own asses in case you have some ridiculous setup or (more likely) a crappy PSU that advertises high wattage but has low amps available on a rail, and might get smoked.

 

[hvcrios]

Don't waste your money. You will be more than OK with the 650W unit. Your whole system should use less than 500W. Some examples:

http://www.legitreviews.com/article/1891/12/
http://www.fudzilla.com/home/item/26768-gainward-gtx-680-phantom-2gb-tested/26768-gainward-gtx-680-phantom-2gb-tested?start=11

For a more specific answer, you can also plug all your components into this calculator, which gives similar results:
http://extreme.outervision.com/PSUEngine

Bottom line, the "recommended" power supply that the video card manufacturer gives you is ALWAYS going to be well above what you actually need. Usually by a couple hundred watts. They do this to cover their own asses in case you have some ridiculous setup or (more likely) a crappy PSU that advertises high wattage but has low amps available on a rail, and might get smoked.

Yeah you're right, I really don't wanna go through the hassle that it will be getting this thing back to the online store, plus I guess that I can always get a new PSU in about an year when the aging starts to kick in.

Thanks for your help, I'll be building this baby tomorrow

 

[hvcrios]

Best answer selected by hvcrios.