750 Watt Power Supply Enough for 3-Way 660ti Sli?

[bryce-man]

I have a bit of a dilemma; I'm about to start building my PC and I've been waiting for a good deal on the power supply I want, which is a Seasonic 850 watt 80 Plus Gold and it's usually about $160 but the 750 watt version is on sale for $89 when it's usually $149.  I plan on doing  2-way gtx 660ti sli and maybe even 3-way in the future; I also plan on overclocking an AMD 8350 to about 5GHz.  Would the 750 watt be enough for at least 2 660ti's and the overclock or should I get the 850 watt?

[extremescouter]

The 750 would be enough for 2 way sli. Personally, I probably wouldnt upgrade to 3 way sli in the future, as the scaling starts to taper off. So, if you keep with the 2 660tis, it will be enough. 

[bryce-man]

The 750 would be enough for 2 way sli. Personally, I probably wouldnt upgrade to 3 way sli in the future, as the scaling starts to taper off. So, if you keep with the 2 660tis, it will be enough. 

 

You have a good point with the 3-way sli performance.  I'm also only running 1 1080p monitor so the 3-way wouldn't increase performance that much.  What if I overclock each card would it still be enough?

[Andi]

750W is easy enough for 3 660Ti's. One 660Ti is 130W. Overclocked 8350 maybe max 150W. But tripple SLI scales really bad. I would stick with normal SLI and get 670's

[extremescouter]

You have a good point with the 3-way sli performance.  I'm also only running 1 1080p monitor so the 3-way wouldn't increase performance that much.  What if I overclock each card would it still be enough?

 

Yes it will be good enough, on Tom's Hardware, theres a guy running two oc'd 660tis in sli, and he is using a 620w power supply. Usually, people get way to much wattage for what they need. 

[BlackOutCrisis]

660ti performs better than a single 680 in pretty much every game so I would expect it to be enough for awhile. I would wait until 700 series launchs though because you can grab a 760ti which is a rebranded 670 and is still planned to be the same price and the 660ti is now.

[bryce-man]

Yes it will be good enough, on Tom's Hardware, theres a guy running two oc'd 660tis in sli, and he is using a 620w power supply. Usually, people get way to much wattage for what they need. 

Awesome!  I really didn't want to pass up this awesome deal! 

[extremescouter]

Awesome!  I really didn't want to pass up this awesome deal! 

 

Yeah, its always good to jump on things when they are on amazing deals. 

[bryce-man]

750W is easy enough for 3 660Ti's. One 660Ti is 130W. Overclocked 8350 maybe max 150W. But tripple SLI scales really bad. I would stick with normal SLI and get 670's

Yeah I think I'm just going to stop at 2-way sli.  And i would get 670's but there just a little out of my price range.  I got my ASUS DCUII 2GB on sale for $250 already anyway.

[Blade of Grass]

According to the eXtreme Power Supply Calculator, you'll be pulling about 700w max load with two HDDs, five fans, 3 660TIs, and a 8350 at 100% load.