XFX650w for GTX660 sli?

[rockazs]

hi is this psu enough to run 2 gtx 660's?
http://www.ebay.it/itm/Alimentatore-XFX-Pro-Series-650W-80-Bronze-650-Watt-CORE-EDITION-P1-650S-NLB9-/380636495545?pt=Alimentatori_per_PC_e_Server&hash=item589fb3feb9&_uhb=1#ht_4678wt_1068
or buy a corsair CX750w instead?
http://www.ebay.it/itm/Alimentatore-XFX-Pro-Series-650W-80-Bronze-650-Watt-CORE-EDITION-P1-650S-NLB9-/380636495545?pt=Alimentatori_per_PC_e_Server&hash=item589fb3feb9&_uhb=1#ht_4678wt_1068
but i saw some people having problems with this CX750 in terms of noisy buzzes with high fps etc..and its confusing me coz 660 sli req. is 700w but some people said that it will only consume 600w+ with a good PSU..

this'll be my future rig:
i5 3570k 4.5ghz
2x gtx 660oc
1TB hdd
hyper 212+ push/pull
asrock z77 extreme6

thanks in advance 😀

 

[bigpinkdragon286]

The power supply you're listing first has a single 12V rail capable of some 53 amps. One GTX 660, all other branding and special editions aside, is listed at 140W on NVidia's site, which means it comes in around 12 amps if you round up. Two together, plus all your other components, should run happily on the XFX Pro series power supply, with room to spare. If you were planning on something other than a stock GTX 660, you should let us know so the numbers can be adjusted.

Adjusting for 80% of the power supply, you get 42.4 usable amps from what I can see.

This is presuming that you have the single 6-pin power connection for your 660, but you list it as a 660oc, so, if you've something to add, it might be helpful, though likely it won't make a big difference. Specific make / model?

You don't need the 700W supply from what I can see.

 

[rockazs]

The power supply you're listing first has a single 12V rail capable of some 53 amps. One GTX 660, all other branding and special editions aside, is listed at 140W on NVidia's site, which means it comes in around 12 amps if you round up. Two together, plus all your other components, should run happily on the XFX Pro series power supply, with room to spare. If you were planning on something other than a stock GTX 660, you should let us know so the numbers can be adjusted.

Adjusting for 80% of the power supply, you get 42.4 usable amps from what I can see.

This is presuming that you have the single 6-pin power connection for your 660, but you list it as a 660oc, so, if you've something to add, it might be helpful, though likely it won't make a big difference. Specific make / model?

You don't need the 700W supply from what I can see.

im just goin to add some 140/120mm fans like 4 - 5 and 1 dvd rom..so this xfx 650w is too much for my rig? or should i just get a lower psu xfx 550w maybe? its more preferably for me coz its cheaper 😀

 

[bigpinkdragon286]

The XFX 550W with the single 44 Amp 12V rail should be fine.

 

[rockazs]

The XFX 550W with the single 44 Amp 12V rail should be fine.

yea this is the one im getting (pro series core edition). =) glad that i did asked here first before i make a mistake^^
thanks for the help!

 

[bigpinkdragon286]

That's what we're here for! 🙂