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Thread: Which PSU wattage for new build (i7-6700K, GTX970)?

  1. #1
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    • Timo's system
      • Motherboard:
      • Gigabyte GA-P35-DS4, with modified BIOS version F13b
      • CPU:
      • Intel Q9450 2.67GHz Quad, with Zalman CNPS9700 heatsink & fan.
      • Memory:
      • 2 x 2GB Crucial DDR2
      • Storage:
      • 1x 2TB WD Black, 1x 1TB WD Black, 1x 500GB WD Caviar RE2
      • Graphics card(s):
      • Gigabyte 512mb nVidia 9600GT
      • PSU:
      • Corsair 520W HX
      • Case:
      • Nzxt Lexa
      • Operating System:
      • Windows 8.1 x64
      • Monitor(s):
      • 22" Samsung SM226BW 1680x1050 widescreen
      • Internet:
      • BT 38mb fibre

    Which PSU wattage for new build (i7-6700K, GTX970)?

    For my former build (Gigabyte GA-P35-DS4, Core2 Q9450 2.67GHz quad, 4GB DDR2) I used a Corsair HX520 PSU and was impressed by its build quality, stability (been using it every day since 2008) and modularity, and wanted to opt again for a Corsair PSU for a new build.

    Looking at the following build:

    • Asus Z170-A motherboard
    • Core-i7 skylake 6700K 4.0GHz quad, with Noctua NH-U14S CPU fan (air cooling)
    • 16GB (2x8GB) Corsair DDR4 Vengeance LPX Black, 3000MHz, CAS 15-17-17-35, 1.35V
    • 4GB MSI nVidia GeForce GTX 970 graphics
    • 3 or 4x SATA 7200RPM internal hard-drives
    • Texas Instruments Firewire PCIe board with bus power (to power an external Motu Traveler firewire soundcard)
    • Samsung DVD-RW/BluRay
    • Floppy drive (yep, I still use floppy disks for external studio equipment)
    • 3 standard case fans (no radiators nor liquid cooling)
    • Windows 8.1/10

    Extra details:

    • The computer will mostly be used for:
    1. high-performance, very low-latency audio production
    2. 3D rendering (3Ds Max)
    3. casual gaming
    • I may have the CPU professionally overclocked to 4.6GHz by 3XS - but if doing so necessitates liquid cooling, I'll most likely leave it at stock 4.0GHz and stick to using standard air cooling instead.
    • I will never install a graphics card more powerful than the GTX 970 for the lifetime of this machine, I'm merely a casual gamer and the GTX 970 is already more than I'd ever need.
    • I will never need nor use two graphics cards (SLI/Crossfire).
    • The only thing I may add in future is an SSD harddrive.

    Given the above, which wattage should I be looking for in a PSU for this build?

    Many thanks,
    Timo

  2. #2
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    • gupsterg's system
      • Motherboard:
      • Asus Maximus VII Ranger
      • CPU:
      • i5 4690K @ 4.9GHz
      • Memory:
      • Kingston HyperX Savage 2400Mhz 16GB
      • Storage:
      • Samsung 840 EVO 250GB + HGST 2TB
      • Graphics card(s):
      • Sapphire R9 Fury X
      • PSU:
      • Cooler Master V850
      • Case:
      • Silverstone Temjin 06 plus mods ;)
      • Operating System:
      • Win 7 Pro x64 / Win 10 Pro x64
      • Monitor(s):
      • Asus MG279Q
      • Internet:
      • TalkTalk VDSL

    Re: Which PSU wattage for new build (i7-6700K, GTX970)?

    Hi,

    Have you tried this? Link:- http://outervision.com/power-supply-calculator
    i5 4690K @ 4.9GHz CPU@1.255v 4.4GHz Cache@1.10v - Archon SB-E X2 - Asus Maximus VII Ranger
    Kingston HyperX Savage 16GB@2400MHz 1T - Sapphire R9 Fury X (1145/545 Custom ROM, ~17.7K 3DM FS)
    Samsung 840 Evo 250GB - Cooler Master V850

    R7 1700@3.8GHz - Archon IB-E X2 - Asus Crosshair VI Hero - G.Skill Trident Z 3200MHz C14 - Sapphire Fury X (1145/545 Custom ROM, ~17.2K 3DM FS)
    Samsung 840 Evo 250GB - Cooler Master V850


  3. #3
    Registered+
    Join Date
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    • Timo's system
      • Motherboard:
      • Gigabyte GA-P35-DS4, with modified BIOS version F13b
      • CPU:
      • Intel Q9450 2.67GHz Quad, with Zalman CNPS9700 heatsink & fan.
      • Memory:
      • 2 x 2GB Crucial DDR2
      • Storage:
      • 1x 2TB WD Black, 1x 1TB WD Black, 1x 500GB WD Caviar RE2
      • Graphics card(s):
      • Gigabyte 512mb nVidia 9600GT
      • PSU:
      • Corsair 520W HX
      • Case:
      • Nzxt Lexa
      • Operating System:
      • Windows 8.1 x64
      • Monitor(s):
      • 22" Samsung SM226BW 1680x1050 widescreen
      • Internet:
      • BT 38mb fibre

    Re: Which PSU wattage for new build (i7-6700K, GTX970)?

    Ah, thank you, seems the build with internal and external hardware, overclockings, and adding an extra buffer would draw under 600W at absolute full tilt, so would a 750W PSU or thereabouts appear sensible?

    Looking at the Corsair HX750i

  4. #4
    Senior Member
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    • gupsterg's system
      • Motherboard:
      • Asus Maximus VII Ranger
      • CPU:
      • i5 4690K @ 4.9GHz
      • Memory:
      • Kingston HyperX Savage 2400Mhz 16GB
      • Storage:
      • Samsung 840 EVO 250GB + HGST 2TB
      • Graphics card(s):
      • Sapphire R9 Fury X
      • PSU:
      • Cooler Master V850
      • Case:
      • Silverstone Temjin 06 plus mods ;)
      • Operating System:
      • Win 7 Pro x64 / Win 10 Pro x64
      • Monitor(s):
      • Asus MG279Q
      • Internet:
      • TalkTalk VDSL

    Re: Which PSU wattage for new build (i7-6700K, GTX970)?

    I reckon you can go lower.

    That calculator is known to go a little over kill , so you already have a buffer .

    Bit Tech review of i7 6700K, under heading Power Consumption have a read .

    They were not loading up the GPU (they had a 390 in the setup) you can see even when OC'd to 4.8GHz their bench setup is pulling 197W at power meter on wall socket, standard 970 specs state 145w as max for card; so you could say 197W+145W=342W.

    The kind of power P95 small ffts pulls through a CPU in general use / gaming you never gonna see that being pulled IMO (from tests I've done on my systems, still exc.GPU load).

    I'd say a decent 500W is gonna be ample, only time I'd get a bigger PSU is if it's working out similar / price efficient. For example the CoolerMaster V650 was £61 inc VAT/P&P at the time of purchase and a 550W version was £70 odd IIRC.

    Here is a Bit Tech roundup of some GTX 970s, these power figures are for the GPU under load and is their whole bench systems power use. Check out the test setup page plus read each cards specs as any pre'OC'd ones will pull more power than non OC'd (again consult graph on power page).

    *** edit ***

    CCL have the CM V650 Semi modular for £67 inc VAT shipping, OEM is Enhance for that PSU, check out review on TechPowerup for V550.
    Last edited by gupsterg; 07-10-2015 at 07:53 AM.
    i5 4690K @ 4.9GHz CPU@1.255v 4.4GHz Cache@1.10v - Archon SB-E X2 - Asus Maximus VII Ranger
    Kingston HyperX Savage 16GB@2400MHz 1T - Sapphire R9 Fury X (1145/545 Custom ROM, ~17.7K 3DM FS)
    Samsung 840 Evo 250GB - Cooler Master V850

    R7 1700@3.8GHz - Archon IB-E X2 - Asus Crosshair VI Hero - G.Skill Trident Z 3200MHz C14 - Sapphire Fury X (1145/545 Custom ROM, ~17.2K 3DM FS)
    Samsung 840 Evo 250GB - Cooler Master V850


  5. Received thanks from:

    Timo (16-10-2015)

  6. #5
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    Re: Which PSU wattage for new build (i7-6700K, GTX970)?

    Quote Originally Posted by Timo View Post
    Ah, thank you, seems the build with internal and external hardware, overclockings, and adding an extra buffer would draw under 600W at absolute full tilt, so would a 750W PSU or thereabouts appear sensible?

    Looking at the Corsair HX750i
    For that spec you provided, a 600w power supply is definitely more than adequate for the system. I'd would go for a 750w range like that HX750i you mentioned, if you are looking forward to add another 970 in the future, then the 750w would make a lot of sense.

  7. Received thanks from:

    Timo (16-10-2015)

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