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Is a 650W PSU enough to SLI 780 TIs?

#1Pepys MonsterPosted 11/19/2013 1:48:32 AM
If not, how much wattage do I need?
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#2nIMr0D888Posted 11/19/2013 2:02:06 AM
It would be close to 650w running 100% (burn in test), should be able to handle it if it's a quality unit. Personally I would want 750 +
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#3_GRIM_FANDANGO_Posted 11/19/2013 2:05:18 AM
Under load the GPU's alone would require about 500 watt (look up the tests, there are plenty to be found).

If you use one of the newer Haswell CPU's that would be around 100 watt I guess.

Even though I estimate entire system wattage under full stress to be under 650, it would be cutting it close. Especially if you overclock. If it is not a quality PSU do not even think about it.

Just googled it:
http://www.guru3d.com/articles_pages/gtx_780_ti_sli_geforce_review,4.html

System wattage reported full load 617.
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#4KabtheMentatPosted 11/19/2013 2:41:19 AM
I've never Crossfire/SLI-ed before, but I've been told a few times that a good 700W unit would be pretty good if I ever wanted to do it.
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#5_GRIM_FANDANGO_Posted 11/19/2013 4:04:11 AM(edited)
KabtheMentat posted...
I've never Crossfire/SLI-ed before, but I've been told a few times that a good 700W unit would be pretty good if I ever wanted to do it.


That is kind of a vague statement. Obviously it depends on which GPU you want to Crossfire or SLI, and what kind of components you have for the rest of your build. 700W could both be too much or not enough depending on those things. Though I agree that for a lot of popular components that people are using now, 700W should be fine.
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#6KabtheMentatPosted 11/19/2013 5:11:47 AM
Well, yeah. I assumed it meant an average build. Decent AMD or Intel CPU, 2 GPUs, maybe an aftermarket CPU fan, 8GB RAM, blah blah blah.
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Big Money. Big Women. Big Fun.
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#7thaandieselPosted 11/19/2013 8:01:13 AM
Typically, yes, 700 watts would do for just about all new SLI cards, your issue being is you picked the biggest and best gpu's to do it with hehe.
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#8ThePCElitistPosted 11/19/2013 8:05:36 AM
I would go 850 to be safe and have some comfort space.
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#9fuzzymanPosted 11/19/2013 8:22:21 AM(edited)
250-300W per card depending on load and clocks
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#10Dillinger7311Posted 11/19/2013 8:54:33 AM
I would say no. My rig at full load is around 750w with sli 780's. I would go with at least a 850w so your PSU is not struggling to keep up.
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