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

[al10677]

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

Build:

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 @ Overclockers.co.uk)
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 @ Scan.co.uk)
Case: Silverstone SST-RL01B-USB 3.0 (Black) ATX Mid Tower Case (£35.16 @ Scan.co.uk)
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 @ Scan.co.uk)
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)

 

[gpellis87]

I would go with 550W. You definitely don't want to be right on the limit for power.

 

[al10677]

What about 450W?

 

[djangoringo]

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.

 

[FinneousPJ]

Yeah the 550W is great, do you really need to save a couple of quid from a build of £700?