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Can you explain this?

hi_im_snowman

27 months ago

I'm trying to get things straight regarding PSU wattage calculations...

  • Outervision recommended a 1000-watt psu;
  • My own experience and common sense told me a 650-watt psu was sufficient;
  • Real-world maximum wattage measured precisely at wall with a Rio-Rand wattage meter: 395.1 watts*

*My 6700k is running @ 4.7 ghz, 1.396v and my 1080 strix is at 2,100mhz (yes, overclocked to precisely 2,100mhz)

Why are PSU measurements so far off from reality? Am I missing something?

Here's my current build, up-and-running:

PCPartPicker part list / Price breakdown by merchant

Type Item Price
CPU Intel - Core i7-6700K 4.0GHz Quad-Core Processor $419.99 @ NCIX
CPU Cooler Corsair - H100i v2 70.7 CFM Liquid CPU Cooler $129.98 @ NCIX
Motherboard Asus - STRIX Z270-E GAMING ATX LGA1151 Motherboard $272.98 @ Newegg Canada
Memory Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3200 Memory $199.48 @ Newegg Canada
Storage Mushkin - Reactor 512GB 2.5" Solid State Drive $230.98 @ Newegg Canada
Storage Western Digital - BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive $162.50 @ Vuugo
Storage Western Digital - BLACK SERIES 2TB 3.5" 7200RPM Internal Hard Drive $162.50 @ Vuugo
Video Card Asus - GeForce GTX 1080 8GB ROG STRIX Video Card -
Case Corsair - Crystal 570X RGB ATX Mid Tower Case $219.99 @ NCIX
Power Supply EVGA - SuperNOVA G3 650W 80+ Gold Certified Fully-Modular ATX Power Supply $124.99 @ NCIX
Operating System Microsoft - Windows 10 Pro OEM 64-bit $182.75 @ Vuugo
Case Fan Corsair - Air Series AF120 Performance Edition (2-Pack) 63.5 CFM 120mm Fans $41.98 @ Newegg Canada
Case Fan Corsair - SP120 RGB High Performance 52.0 CFM 120mm Fan $23.08 @ Newegg Canada
Case Fan Corsair - SP120 RGB High Performance 52.0 CFM 120mm Fan $23.08 @ Newegg Canada
Case Fan Corsair - SP120 RGB High Performance 52.0 CFM 120mm Fan $23.08 @ Newegg Canada
Case Fan Corsair - SP120 RGB High Performance 52.0 CFM 120mm Fan $23.08 @ Newegg Canada
Case Fan Corsair - SP120 RGB High Performance 52.0 CFM 120mm Fan $23.08 @ Newegg Canada
Case Fan Corsair - SP120 RGB High Performance 52.0 CFM 120mm Fan $23.08 @ Newegg Canada
Monitor Samsung - LC24FG70FQNXZA 24.0" 1920x1080 144Hz Monitor $399.00
Headphones Bose - QC35 Headset $516.21 @ Amazon Canada
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates) $3221.81
Mail-in rebates -$20.00
Total $3201.81
Generated by PCPartPicker 2017-06-29 15:10 EDT-0400

Comments

  • 27 months ago
  • 1 point

You mean to ask why the calculator recommended almost 3x more power than needed? Because calculators don't work, it's that simple. Just use real world power consumption tests.

  • 26 months ago
  • 1 point

You shouldn't use PSU calculators, they are always wrong since they are not based on real world results and instead use TDP and turn the overkill up to 11. PCPP does the same but they aren't so overkill about it. TDP does not equal power draw. Real world results are well real and the best you can get.

You are using about 350W at the very max.

[comment deleted by staff]

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