How much power do I need for my build?

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Hilmi Hut

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Jan 5, 2014
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Currently, I'm planning a new rig and intending to overclock my cpu...

I've tried the website http://www.extreme.outervision.com/PSUEngine but I'm still wasn't sure how to calculate overclock VCOREs for final values.

Hopefully users here are able to help me out :) (Really appreciate 'em)


So here are my components listed:

Motherboard & CPU: Asus P8Z77-V w/ Intel I5-3570K @ 3.4GHz (overclocking to 4Ghz)

RAM: 16Gb of Corsair Vengeance Pro DDR3 (4 sticks of 4Gb)

CPU Cooler: Corsair H100i Water cooler

GPU: MSI GTX 770 OC Twin Frozer OC 2Gb

Storage: -Samsung SSD 840 Pro 128Gb SSD
-Seagate Barracuda 7200rpm 1Tb HDD
Soundcard: Creative SB Z Model SB1500

Optical drive: Samsung 24x Sata

For the PSU, I have these few in my mind...
-Seasonic Platinum 760W
-Corsair AX760i Full Modular Plat 760W
-Seasonic X Series 850W
-Corsair Professional Series Gold AX850

I just need something sufficient and not too much of an overkill for my PSU (something worth the buck too.)

Do give more suggestions of what PSUs I should get if that feels better than my listed ones.

Thanks for taking the time to read my thread. :)

 
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rolli59

rolli59

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Oct 27, 2007
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heisnburg

heisnburg

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May 6, 2013
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i myself have been able to achieve a 4.5GHz OC on my Corsair HX850w with Sli 670s and 16GB of ram, so an 850w psu should work well :)
 
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scoobydenon

scoobydenon

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Feb 27, 2011
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If you think you will add a graphics card in the future, get the AX860 (The AX850 may be harder to find) If no upgrades are planned either of the 760 watt PSU's are outstanding choices. I'm using the AX850 and it's an excellent PSU. Seasonic & Corsair are pretty much the same, enjoy...
 
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casper1973

casper1973

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Dec 30, 2012
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A good quality 600W PSU would work for that build so any of your suggestions would be fine (Assuming you don't add a second GPU in the future)

Some cheaper suggestions (But still good quality):
- Corsair TX650
- EVGA NEX650G Gold
- SeaSonic M12II 620 Bronze
- XFX P1-650S-NLB9
 
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jimmysmitty

jimmysmitty

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Oct 5, 2007
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The Seasonics and Corsairs you have listed are very similar. Personally, go with the Platinum rated at minimum as it will be more efficient and as well I know for sure the Corsair has a fanless mode at under 30% load, I have the AX860i and it never spins up.

Both are the top for PSUs and would be great but I would go with the Corsair as that's what I have been using and have had amazing luck with them. I had a TX850W that lasted from 2007 until now so about 7 years and is still good. Add in the fact that it is a platinum which means under 50% load you will be getting 92% or better efficiency, its a great PSU to have.
 
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Derza10

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Sep 7, 2012
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Just want to point out that the power consumption values they give are from the wall and not what the PSU is supplying the computer... so in reality a 650w PSU would be plenty for SLI. ~400w for total system draw with one from the wall is the PSU supplying about 320w to the computer (assuming it is an 80% efficiency PSU). Adding a second 770 might push the from wall numbers to ~600w. Or 480w supplied to the computer by the PSU, still 170w short from maxing out a 650w PSU.

From the wall readings are very misleading, the way a PSU works is if it is say a 650w PSU at 80% efficiency it is able to pull as much as 812.5W from the wall to supply the computer with the 650 watts of power.
 
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jimmysmitty

jimmysmitty

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Oct 5, 2007
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While this is true, you still want overhead in order to keep the PSU from running at max load all the time as this will make it last longer. I have a TX850W that I used for 7 years and is still good because it is well more than I needed for my system and probably rarely went over 50% load.

The benefit to higher efficiency, Platinum etc, is that it will need to pull less from the wall to provide the same amount of power meaning lower load %, lower temps and lower power bill overall.
 
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Derza10

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Sep 7, 2012
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It is normally best to have your PSU run at 40-60% load to get the most efficiency out of it. having 470w out of 650w is about 72% load... but remember this is at MAX load that it will hit this number... Normal gaming on a 650w PSU with SLI 770's would be in that 40-60% load most of the time... Getting a PSU that is to big will make this number drop out of the "most efficient" range of your psu. Personally I wouldn't get anything bigger than a 750w for SLI 770's, and 650w would be plenty.
 
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Hilmi Hut

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Jan 5, 2014
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Great tip to learn about PSUs! Thanks, jimmysmitty!
 
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