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Which size PSU for this system?

Discussion in 'Power Supplies' started by King Mustard, Apr 2, 2018.

  1. King Mustard

    Gangster

    Joined: Sep 25, 2011

    Posts: 291

    Location: West Midlands

    • 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.
     
  2. Pocah

    Hitman

    Joined: Jul 11, 2017

    Posts: 585

    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.
     
  3. Habakkuk

    Hitman

    Joined: Feb 7, 2017

    Posts: 851

    650W will suffice at a minimum, up towards 800W incase you want to overclock in the future.
     
  4. TeraVirus

    Gangster

    Joined: Oct 24, 2017

    Posts: 260

    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.
     
  5. tamzzy

    Soldato

    Joined: May 26, 2012

    Posts: 5,969

    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)
    [​IMG]
    labelled as a 600w psu.
    but if you see the sticker, can actually only supply 450w on the 12v rail...
     
  6. Habakkuk

    Hitman

    Joined: Feb 7, 2017

    Posts: 851

    650 is sufficient, go with larger if you want to furutreproof/overclock/aging capactiors overhead later.