Do i need a power supply this big for my build?

Hey :D im wondering if i need a 550W power supply for this build, or a 400w?


PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£164.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.00 @
Motherboard: MSI Z77A-G41 ATX LGA1155 Motherboard (£62.99 @ Novatech)
Memory: GeIL Enhance CORSA 8GB (2 x 4GB) DDR3-1600 Memory (£30.23 @ CCL Computers)
Storage: Seagate Constellation ES 1TB 3.5" 7200RPM Internal Hard Drive (£43.82 @ Aria PC)
Video Card: MSI Radeon HD 7950 3GB Video Card (£221.75 @
Case: Silverstone SST-RL01B-USB 3.0 (Black) ATX Mid Tower Case (£35.16 @
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£49.98 @ Novatech)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£12.98 @
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£67.96 @ CCL Computers)
Total: £713.86
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-05 19:46 GMT+0000)
4 answers Last reply
More about power supply build
  1. I would go with 550W. You definitely don't want to be right on the limit for power.
  2. What about 450W?
  3. Stay with your current psu, the xfx 550w, you could get the xfx 450w, but i wouldn't recommended it.
    I'd get low profile ram, that geil ram has really tall heatsinks which could block the cooler.
  4. Yeah the 550W is great, do you really need to save a couple of quid from a build of £700?
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