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I need 574 watts, should i get a 650w psu with 90% eff or a 750w one?

post #1 of 12
Thread Starter 
Hello, i need a bit of advice, i'm not sure which power supply would be better.
I know that it's not good to have too much over what you need and i used a power calculator (i think the cooler master one) and it said i need 574w with 2 gtx 980, i only have one atm but i intend to sli it 1 or 2 years from now.
With the 650w psu i get 585w, right at the limit and with the 750w psu i get 675w.
I don't really know what to pick, the 650w psu seems to close to what i need once use 2 gtx 980's, but with the 750w psu i'm worried that i'll have too low consumption on idle which i heard isn't good either.
Any advice?
post #2 of 12
Uh, with two 980's, an Intel/AMD CPU, plus Hard drives...and other pieces..you'll be pushing 700W easily. I'd recommend a 750W on the low end...may wanna consider 800W.

Edit: Tried using a calculator on Corsair's site...and they were recommending 750W PSU's. So I'd go with 800W at the least.
Edited by cloudbyday - 9/24/15 at 10:31am
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post #3 of 12
All online calculators are unreliable, inaccurate, and imprecise and therfore useless so dont bother with any of them its a waste of time.
Quote:
Originally Posted by cloudbyday View Post

Uh, with two 980's, an Intel/AMD CPU, plus Hard drives...and other pieces..you'll be pushing 700W easily. I'd recommend a 750W on the low end...may wanna consider 800W.

The system he has would not draw more then 550-600 watts (unless he is going to volt mod the BIOS on his GTX 980 cards) so a 750 watt PSU would be fine.
And again ALL calculators are useless.
Edited by shilka - 9/24/15 at 10:35am
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post #4 of 12
Just get a 750W so you can have some headroom for overclocking/ future upgrades. I recommend http://www.newegg.com/Product/Product.aspx?Item=N82E16817139055&cm_re=750w-_-17-139-055-_-Product

I only pull 400W from the wall on my 4770k @4.3GHz 1.32V and 970 @1600MHz while under a full AIDA64 stress test which equates to about 360 watts on the psu. 750 watts will be fine.
Edited by ODSTjoker - 9/24/15 at 10:35am
post #5 of 12
Quote:
Originally Posted by ODSTjoker View Post

Just get a 750W so you can have some headroom for overclocking/ future upgrades. I recommend http://www.newegg.com/Product/Product.aspx?Item=N82E16817139055&cm_re=750w-_-17-139-055-_-Product
EVGA SuperNova G2 750 watt is almost the same price and offer a longer warranty and its also slightly better.

http://www.newegg.com/Product/Product.aspx?Item=9SIA24G28N0668&cm_re=EVGA_SuperNova_G2-_-17-438-017-_-Product

You can also get CableMod cables for the G2 you cant with the Corsair RMi.
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post #6 of 12
Thread Starter 
I was thinking about the cooler master v750 series, they seem to have pretty good protections and 80%+gold.
post #7 of 12
Quote:
Originally Posted by shilka View Post

EVGA SuperNova G2 750 watt is almost the same price and offer a longer warranty and its also slightly better.

http://www.newegg.com/Product/Product.aspx?Item=9SIA24G28N0668&cm_re=EVGA_SuperNova_G2-_-17-438-017-_-Product

You can also get CableMod cables for the G2 you cant with the Corsair RMi.

I forgot about the G2... oops
post #8 of 12
Quote:
Originally Posted by Christo4 View Post

I was thinking about the cooler master v750 series, they seem to have pretty good protections and 80%+gold.
You are aware that 80 plus has nothing to do with any kind of quality rated output or stability right?
Not that the V750 is bad but 80 plus does not make anything good.
Why 80 PLUS® is Irrelevant to You When Buying a PSU

There is a fully modular version of the V750 on the way but there is no word on any date.
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post #9 of 12
Yeah, just get the G2, itll do you just fine smile.gif
post #10 of 12
Thread Starter 
Well, i'll see if i can find it somewhere locally.
Othewise i think i'll get the v750, i think that it should be ok right?
Thanks for the advice guys!
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