Corsair hx850 enough for this gtx 780 sli setup?

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James Li

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Jun 12, 2013
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Buidling a new system and wondering if an hx850 is enough for:
msi z87 gd65 gaming motherboard
intel i7 4770k
gskill 2400 tridentx
ASUS gtx 780 sli
with 8 case fans
30 w fan controller
razer blackwidow and naga mouse+keyboard
Corsair h100i cpu cooler
corsair hx850????????
I am planning to overclock the cpu to 4.5-4.7 and OC the graphics cards as high as temp will allow. Is the power supply i am planning to use sufficent or should i wait a little while more and upgrade to a 950w or 1000w power supply or grab an alternative option.

So final question:higher wattage than hx850 or keep it?
Thanks for the time and expertise

 
Solution
Z
HX850 is a single rail PSU rated for 70 amps on the 12V (840 of the 850 watts can come from the 12V)

4770K is a 84W part. A stock 780 is rated for 250W.

Assuming a 25% overhead for overclocking (real generous, not likely to push it that far).. you're looking at 730W there.
Add in a few fans, ram, motherboard, hard drives, etc.. you're still under it's sustained power rating.

You can see here http://www.tweaktown.com/articles/5505/nvidia-geforce-gtx-780-3gb-overclocked-closing-the-gap-on-the-gtx-titan/index21.html they pulled 500watts from the AC source, using an overclocked 32nm CPU spec'ed for 130W with an AX-1200 Corsair power supply when testing the power draw of an overclocked 780 under load.

According to...
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zyky

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HX850 is a single rail PSU rated for 70 amps on the 12V (840 of the 850 watts can come from the 12V)

4770K is a 84W part. A stock 780 is rated for 250W.

Assuming a 25% overhead for overclocking (real generous, not likely to push it that far).. you're looking at 730W there.
Add in a few fans, ram, motherboard, hard drives, etc.. you're still under it's sustained power rating.

You can see here http://www.tweaktown.com/articles/5505/nvidia-geforce-gtx-780-3gb-overclocked-closing-the-gap-on-the-gtx-titan/index21.html they pulled 500watts from the AC source, using an overclocked 32nm CPU spec'ed for 130W with an AX-1200 Corsair power supply when testing the power draw of an overclocked 780 under load.

According to http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=189 at around 525 watts from the AC source, the power supply they used for testing is 90.1% efficient

So that 500 watts from the wall equates to 450 watts being drawn by the components from the power supply, leaving roughly 400 watts overhead for your additional 780 and all those fans.

The 850 should work fine.
 
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