Which size PSU for this system?

King Mustard

King Mustard

King Mustard

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  • 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.
 
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.
 
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.
 
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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