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How much power does this build need?

Adik
  • 47 months ago

I'm planing to buy this gaming PC soon. I was gonna buy the Seasonic S12II 620W. But when I calculated my build using a online power calculator it shows that I need only 378W and a Sesasonic S12II 520W is enough. Here is my build: PCPartPicker part list / Price breakdown by merchant

Type Item Price
CPU Intel Core i5-6500 3.2GHz Quad-Core Processor $194.99 @ SuperBiiz
Motherboard Gigabyte G1.Sniper B7 ATX LGA1151 Motherboard $77.99 @ Newegg
Memory Team Elite Plus 8GB (2 x 4GB) DDR4-2400 Memory $34.98 @ Newegg
Storage Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive $46.98 @ OutletPC
Video Card Sapphire Radeon R9 380X 4GB NITRO Video Card $238.98 @ Newegg
Case Thermaltake Versa H25 ATX Mid Tower Case $48.99 @ SuperBiiz
Optical Drive Samsung SH-224FB/RSMS DVD/CD Writer -
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates) $652.91
Mail-in rebates -$10.00
Total $642.91
Generated by PCPartPicker 2016-05-01 03:15 EDT-0400

I'm a little confused now. Because, the recommended PSU for the 380X is 500W. So, isn't a 550W too low for this build? Any other opinions on this build would be very much appreciated.

Comments

  • 47 months ago
  • 2 points

PSU recommendations for a GPU result from what's generally available in the PSU market. GPU manufacturers benefit from overshooting their recommendations because it removes them from liability if someone were to destroy a card on a useless supply. Also, they recommend power supplies based on the amount of PCIe power connectors that are regularly available at different wattage ranges.

So in short, as long as the PSU is reliable, has the necessary power connectors, and is at least 15-20W above the system draw (just to play it safe, though in reality a good PSU can handle overloads with grace)

The 520w Seasonic will be perfectly fine for this build. It's a great supply.

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