Can my 650w PSU handle this setup?

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ibowix

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Dec 15, 2014
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Hy,

I am planning on upgrading my current system with two Zotac GTX 970s, but I am not sure if my 650w Cooler Master PSU can handle the load.

http://prohardver.hu/dl/cnt/2014-01/104811/pic/cooler_master_g650m_spec.jpg

Some say it will be enough and others tend to say that i will need at least a 850w PSU, so I am a little confused. I also so a guy on youtube running 2 GTX 970s on a 620w Corsair PSU and he was fine.

So what do you think? My problem is that i dont really want to upgrade my psu again, because i bought it like 8 months ago.

rest of my system looks like this:

i5 4670k (no OC)
MSI Z97 Krait
8GB 1600mhz Ram
3 HDDs
1 SSD
8 120mm Fans
 
Solution
Math Geek
ok so here's the math involved. roughly 150 watts per 970 + another 150 watts (generous) for the rest of the system = 450 watts on your 12v rail needed. this is 37.5 amps. your psu has 52 amps on it's 12v rail. so you'll be using about 72% of your rated 12v. this is well within safe usage. 80-85% is generally recommendation and your below it so you have room to spare.

i know what the specs pages say but this is the math and you can't argue with the math nor the math geek :D your fine to use the psu you have and as you can see your not over stressing it at all. be sure you have the pcie connectors though. you'll need 4 x 6 pin to run both cards. the molex adapters are not recommended to be used.
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stormflakes

stormflakes

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Jun 6, 2014
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i stand corrected, at the bottom of the link it states the following:

GeForce GTX 670 2x SLI - On your average system the cards require you to have a 700 Watt power supply unit as minimum.

Sorry mate, i wouldn't risk it if i were you
 
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ibowix

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Dec 15, 2014
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I know you shouldn't cut back on the PSU but is it really really really necessary because i am also planning on getting a new monitor and with the sli 970s it will cost me about 1000€ which is already enough.
 
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Math Geek

Math Geek

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Oct 15, 2014
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ok so here's the math involved. roughly 150 watts per 970 + another 150 watts (generous) for the rest of the system = 450 watts on your 12v rail needed. this is 37.5 amps. your psu has 52 amps on it's 12v rail. so you'll be using about 72% of your rated 12v. this is well within safe usage. 80-85% is generally recommendation and your below it so you have room to spare.

i know what the specs pages say but this is the math and you can't argue with the math nor the math geek :D your fine to use the psu you have and as you can see your not over stressing it at all. be sure you have the pcie connectors though. you'll need 4 x 6 pin to run both cards. the molex adapters are not recommended to be used.
 
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Solution
stormflakes

stormflakes

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Hands down to math geek, if he's right you should thank him for saving you 125$.
On the other hand ... math geek has been know to spit soda on his keyboard, you really wanna trust somebody who does that? :-D

Inside joke from a previous post, you can trust him, he knows what he's talking about.
Just give him a best solution and let's move on.
 
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