Will this PSU be enough?

Laucien

Reputable
Jul 27, 2014
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Hi!,

I'm planning to add a second VGA to my build and was giving for a fact that I would need to replace the PSU but after chatting with some friends and using some of the calculators available online I'm not that sure anymore so figured I could ask here.

This is the PSU I have right now http://ocz.com/fatal1ty/fatal1ty-series-gaming-psu the 750w version. I've had it for around 3-to-4 years now.

This is my current build:
i7 4770k
ASUS MAXIMUS VII Ranger.
Nvidia GTX 770 2gb Zotac Amp Edition (factory OC version).
1 7200 RPM HDD.
1 Corsaid SATA SSD.
2x8gb RAM.
Coolermaster V6GT cooler.
4 case fans.
5-to-6 USB devices (keyboard, speakers, mouse, gamerpad, headset, cellphone or something else charging).


What I'm planning to add in the near future is another VGA exactly like the one I currently have, change the V6GT cooler for a Corsair h100i and do some OCing on the CPU. A longer term plan is to either add a second SSD or replace the one I have with something that goes in the M.2 slot on the board.

Would it be enough or should I play it safe and upgrade the PSU?. What I have in mind is either this one http://www.coolermaster.com/powersupply/enthusiast/v1000/ or the 850w version. I know a 1KW might be way too overkill but the price difference between the two where I live is pretty small.
 
Solution
Intel Core i7 4770k TDP is 84W
GTX 770 maximum power is 230W, 230W * 2 = 460W
Allow 40W for other components.
Total draw up to 584W.

You only want to run a power supply at 80% of rated power.
Most of the power is drawn on the +12V rails.
You need a supply rated at 730W or 61A on the combined +12V rails.

The power supply you have is only rated at 54A on the +12V rails.
If it was manufactured from 2013 onwards, it is a tier 4 supply that may not output rated power:
http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html

Cooler Master V series are tier 1, so very good quality.
850W model is rated at 840W or 70A on the +12V rail.
I would thoroughly recommend upgrading to this supply.
1000W model is overkill, but...
Intel Core i7 4770k TDP is 84W
GTX 770 maximum power is 230W, 230W * 2 = 460W
Allow 40W for other components.
Total draw up to 584W.

You only want to run a power supply at 80% of rated power.
Most of the power is drawn on the +12V rails.
You need a supply rated at 730W or 61A on the combined +12V rails.

The power supply you have is only rated at 54A on the +12V rails.
If it was manufactured from 2013 onwards, it is a tier 4 supply that may not output rated power:
http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html

Cooler Master V series are tier 1, so very good quality.
850W model is rated at 840W or 70A on the +12V rail.
I would thoroughly recommend upgrading to this supply.
1000W model is overkill, but there is no harm if the price is close.

 
Solution