CORSAIR CMPSU-620HX or CMPSU-520HX

[chameleon23]

My build is below...I ran the extreme build power calculator and I got just over 400 watts so I'm wondering if the 620 PSU is unnecessary for my build?

Also I want to make sure, is that PSU compatible with an i7 board cause I can't find anything that says so on the Corsair website.

Thank you!

----------------------

Antec Three Hundred Black Steel ATX Mid Tower Computer Case - Retail

EVGA 141-BL-E757-TR LGA 1366 Intel X58 ATX X58 SLI LE Intel Motherboard - Retail

CORSAIR CMPSU-620HX 620W ATX12V v2.2 and EPS12V 2.91 SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC Compatible ... - Retail

Intel Core i7 920 Nehalem 2.66GHz LGA 1366 130W Quad-Core Processor Model BX80601920 - Retail

CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kit Desktop Memory Model TR3X6G1600C8D - Retail

EVGA 896-P3-1257-AR GeForce GTX 260 Core 216 Superclocked Edition 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI ... - Retail

Western Digital RE3 WD1002FBYS 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM

SAMSUNG Black 22X DVD Burner Black SATA Model SH-S223B - OEM

 

[yh125d]

You'd be fine with a good quality 500w yeah. And unless you're using the RE3 drive for a RAID array, just buy the Caviar Black

 

[geokilla]

If you're going to get another GPU in the future and SLI it, then get the Corsair 620HX.

 

[Beanie46]

Well, here's what I've got and what I've seen draw.....

Core i7 920 @ 4GHz @ 1.25V, 6GB Corsair Dominator DDR3-1600 RAM, 2 1TB WD Black hd's, ATI HD4870 1GB video card, 2 Samsung DVD-RW optical drives.....system quite similar to yours.

When I run OCCT 3.1 in power supply test (combination video card test and Linpack), I've seen 565W pulled from my 1500VA UPS.....has an LED readout that gives realtime power draw. Figure a conservative 80% efficient conversion and you have the power supply putting out over 450W....more or less....and probably close to it in reality.

Don't know why you'd settle for a 500W power supply when you'll run it close to 80% output when fully stressing your system. A power supply is most efficient running at 50-60% of total rated output, running close to the ps's total rated capacity creates a lot more heat than running it closer to 50% rated capacity, and heat shortens power supply life. Spend the extra few dollars and buy the 620HX.....the extra headroom is well worth the few extra $$.

 

[chameleon23]

thanks for the tip, i didn't know at what percentage the power supply is most efficient. i'll pay the extra cash, it's not too much more