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Help me choose my PSU :)

Hi guys, whats up? first time poster here....I am currently building my first gaming rig, and after 2 days of googling headache i still can't pretty much decide the power supply i would need to safely run my rig. Here is my current rig :

CPU: Intel Core i5 3570K , planning to overclock it to 4.5 -4.6 GHz

Mobo: AsRock Z77 Extreme 6 Gen 3

RAM: Corsair Vengeance 2x4Gb DDR 3 1600

GPU : GTX 670 ( haven't decided yet which brand i'm going to buy, but i'm leaning towards gigabyte and msi since it is the easiest to find on where i live, or maybe an evga 670 FTW :bounce: ).

ASUS is out of option since they're so expensive here ( about 600-620 USD for vanilla card ! :heink: )

Hard Drive : 1 TB Seagate ( forget the spec because i got it as a replacement for my broken hard drive from my old rig from a computer service center ). I am also planning to add one 120Gb SSD later when i got the cash

Casing : some sort of custom made casing :kaola: plenty of airflow

Cooling : Thermaltake Aquarius II plus 1 High Performance 80mm fan and 2 120mm Fan. Those 3 fans are using LEDS

DVD drive : haven't bought one, but i think i'll just gonna buy a standard cd/dvd RW drive plus card reader :)

Keyboard : currently using an old logitech Y-SZ49, but i'm going to buy a new one that has nice backlit :bounce:

Mouse : Razer Deathadder Dragon Age II edition


I'm also planning to do SLI with the 670 later, especially if could opt for 2560x1440 monitor ( current is 1920 x 1200 ). I am also going to overclock both cards, maybe to 1100ish or 1200ish if possible :bounce:

I may also add some LED's to co cheer up my Rig (yay!)

From what i learn after past 2 days of googling, i would require 750 - 850 watt PSU. I have narrowed my selection to these 2 PSUS : Seasonic X-760 and Corsair HX 850 ( mainly because of price tags, Seasonic is kinda cheap on where i live while Corsair is the contrary ). Price difference is about 20 USD with Corsair being the more expensive

I'm also planning to futureproof a bit, and also if 850watt is a MUST for safely running my rig, i will go for Seasonic X-850 since it is only about 10 bucks price premium over the HX 850.

Corsair HX 750 is out of option since it is more expensive than Seasonic X-760 by around 10 bucks , so i would not go for it. Same goes for AX 850 which is currently priced at 220 USD :heink:

Lastly, another noob question here....i may opt for msi gtx 670 power edition if the review was found to be good. That means i'm likely going to overvolt the card(s). Does that mean i'm going to need a 850watt PSU?


Which one of those PSU's that you guys would recommend for my rig? Also please kindly state your opinion / reason that supports your selection :)

I'm totally new and noob as well in this field, so all of you guys responses are greatly appreciated :)


P.S. Sorry for my bad English. I'm non native :sweat: .
8 answers Last reply Best Answer
More about help choose
  1. seasonic-x is a fantastic psu

    the 760w should do fine

    have a look here for gtx670/2 x gtx670/3 x gtx670 power draw

    http://www.guru3d.com/article/geforce-gtx-670-2-and-3way-sli-review/4
  2. I see....so 760 will do even if i'm going to overvolt the cards ? wouldn't it stress the PSU too much?
  3. Seasonic X-760 is more than enough to run two gtx670 in sli and overclock your cpu and gpu and run led fans elect.
  4. AyuPearL said:
    I see....so 760 will do even if i'm going to overvolt the cards ? wouldn't it stress the PSU too much?
    Nope you'll be fine ;)
  5. Best answer
    nVidia itself recommend 500W for a single 670. Add 170W for SLI & recommended is 670W.
    http://www.nvidia.in/object/geforce-gtx-670-in.html#pdpContent=2

    For testing conducted for SLI 670, the resulting system consumption for SLI is 433W of which 293W are attributed to the gpu cards.
    http://www.guru3d.com/article/geforce-gtx-670-2-and-3way-sli-review/4

    If you use this psu calculator considering your components, the result is 564W (overclocked processor & used 680x2 to simulate gpu OC:
    http://extreme.outervision.com/PSUEngine

    All points out to 750W being more than enough.
  6. so a 850 watt psu is an overkill then? and would actually be more inefficient dealing with my rig? Compared to the X760 i mean
  7. Best answer selected by AyuPearL.
  8. This topic has been closed by Mousemonkey
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