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What PSU wattage needed for this setup?

Last response: in Systems
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October 3, 2012 12:40:05 AM

Hello, forumites;
I have a bit of an urgent inquiry. I'm rebuilding my system and I need to buy a case, a PSU and a screen. Last time I had it assembled I had a 750W PSU for the following components:

Asus P8P67 Pro motherboard
Core i7-2600k overclocked to 4.5GHz
Noctua NH-U12P SE2
Asus GTX 560 Ti TOP
A Western Digital 1TB HDD
A simple optical drive
2x4GB Corsair Vengeance memory

My question is was the 750W an overkill? Even if I decided to upgrade the graphics to SLI or to something like a 660ti, would I need that much power? If not, what could I safely downgrade to?
a b B Homebuilt system
October 3, 2012 4:09:19 AM

Well 750w, is a bit overkill for a single gpu. You would do fine with less power for an sli setup. The 660ti uses less power than the 560ti, so it would be even easier to sli that card.
a c 106 B Homebuilt system
October 3, 2012 4:13:56 AM

A good 550W would actually be enough to run the build as is. 650W is enough for dual cards, but many like to get 750W for the extra headroom.

If the PSU you have is of decent quality and isnt too old, dont see why you would downgrade it. Having too much wattage isnt a bad thing.
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October 3, 2012 4:33:27 AM

Major overkill but i like over kill. If you plan to sli the 560tis 750 is perfect. I dont like pushing PSUs to max usage.
October 3, 2012 4:56:58 AM

manofchalk said:
A good 550W would actually be enough to run the build as is. 650W is enough for dual cards, but many like to get 750W for the extra headroom.

If the PSU you have is of decent quality and isnt too old, dont see why you would downgrade it. Having too much wattage isnt a bad thing.


Unfortunately I was moving country and could only bring along a limited amount of things, I had to leave behind my case, PSU and screen. I managed to bring along my other components in my suitcase (including the Noctua cooler still attached to the mobo...)

If 650W is enough, that'll mean a slight saving for me compared to a 750W one... excellent. Even better that the 660ti is less power-hungry, so a future upgrade won't stretch it. I'll probably go one 660ti rather than two 560ti's in SLI so 650W will be plenty?
a c 106 B Homebuilt system
October 3, 2012 5:01:11 AM

Depends on the PSU in question. But if its a good supply and actually outputs close to 650W through the 12v rail, you should be good to run dual 660Ti's.
a c 106 B Homebuilt system
October 3, 2012 5:39:30 AM

Yep, thats a good PSU from a respectable brand. Gives 624W through the 12v, should be plenty.
!