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Which size PSU for this system?

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

  1. King Mustard


    Joined: Sep 25, 2011

    Posts: 309

    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.
  2. Pocah


    Joined: Jul 11, 2017

    Posts: 819

    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

    Wise Guy

    Joined: Feb 7, 2017

    Posts: 1,004

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


    Joined: Oct 24, 2017

    Posts: 262

    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


    Joined: May 26, 2012

    Posts: 6,187

    IMO, 550w is sufficient, but if 650w offers better value for money, then go with the 650w psu for "more breathing space"

    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...
  6. Habakkuk

    Wise Guy

    Joined: Feb 7, 2017

    Posts: 1,004

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