Which size PSU for this system?

Associate
Joined
25 Sep 2011
Posts
441
Location
United Kingdom
  • Gigabyte Z370XP SLI
  • Intel Core i7-8700K (4.9 GHz @ 1.42v)
  • 2x 8 GB Corsair Vengeance LPX DDR4-3000
  • Zotac GeForce GTX 1080 AMP Extreme (core 1771, boost 1911, memory 2700 MHz)
  • 3x drives
    • 2x SATA3 SSD
    • 1x SATA3 7,200 HDD
  • 4x fans
    • 1x 200mm
    • 1x 140mm
    • 2x 120mm (on a generic 240mm liquid cooler)
  • Asus Xonar DSX
I doubt I'll buy a second GPU in the future.

CoolerMaster PSU Calculator suggests 617 W.
OuterVision PSU Calculator suggests 633 W.
 
Associate
Joined
11 Jul 2017
Posts
816
I think they are about right really. The system will take less than they say but it's always a good idea to get a little more than you need without going mad. A 650W PSU will do you fine now and in the future, it will also run efficiently without getting too taxed when you stress the system.
 
Associate
Joined
24 Oct 2017
Posts
270
Location
Bristol
I agree with the above, 650w would be fine, 750w for breathing room if you want to change to a Ti card, overclock your CPU, add more devices to your system.

A gold+ standard PSU from Seasonic, Corsair, Super Flower, or EVGA, are solid recommendations.
 
Man of Honour
Joined
26 May 2012
Posts
16,179
IMO, 550w is sufficient, but if 650w offers better value for money, then go with the 650w psu for "more breathing space"

http://www.guru3d.com/articles-pages/intel-core-i7-8700k-processor-review,5.html
https://www.anandtech.com/show/10325/the-nvidia-geforce-gtx-1080-and-1070-founders-edition-review/30
take from this what you will.

most 'calculators' overstate the wattage requirements as most people usually skimp and get superbudget psus.

see for example:
My basket at Overclockers UK:
Total: £52.49 (includes shipping: £10.50)
labelled as a 600w psu.
but if you see the sticker, can actually only supply 450w on the 12v rail...
 
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