Power supply recommendation

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vortex_mak

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Aug 8, 2008
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18,510
Can you please suggest a power supply for my build.

I was originally going to go in for a Corsair CX 500 but now I think that might not be enough.
PCPart Picker shows total wattage as 303W

This is my build. I have no plans of overclocking yet
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor (Purchased For $192.59)
Motherboard: ASRock Z87E-ITX Mini ITX LGA1150 Motherboard ($129.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($59.99 @ Newegg)
Storage: Samsung 840 Pro Series 256GB 2.5" Solid State Disk ($212.99 @ B&H)
Video Card: Sapphire Radeon HD 7870 GHz Edition 2GB Video Card ($159.99 @ Newegg)
Power Supply: Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply ($44.98 @ Newegg)
Total: $800.53
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-21 13:23 EST-0500)
 
Solution
misclik
a 500W will be sufficient.

if you want to get a bit more, say a 600, you can do that and you will have some overhead.

either approach will work. if you plan on having a lot of HDDs, then you may want the 600, HDDs ( NOT SSD's, those use <1W peak) use about 15W per drive (safe estimate). if you think you'll ever crossfire the 7870, you may want to go to 700W. They can use 175W at peak if stock, about 200W each if oc/ov/higher power limit.
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misclik

misclik

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Sep 17, 2012
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a 500W will be sufficient.

if you want to get a bit more, say a 600, you can do that and you will have some overhead.

either approach will work. if you plan on having a lot of HDDs, then you may want the 600, HDDs ( NOT SSD's, those use <1W peak) use about 15W per drive (safe estimate). if you think you'll ever crossfire the 7870, you may want to go to 700W. They can use 175W at peak if stock, about 200W each if oc/ov/higher power limit.
 
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Solution
John Bong

John Bong

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Jul 19, 2013
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that will be fine...however if you intend to OC or add case fans/hard drives, etc., a little more power would be advisable...to bump it up to the 600W version, it would only be about a $10 or $15 difference. if you can afford it, check out the Seasonic 620W, it is a very solid PSU.
 
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vortex_mak

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Aug 8, 2008
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18,510
Thanks for the suggestions. It's a mini ITX mobo, so there is no chance of adding anything else.
I will plug in two 2.5" portable USB drives, they shouldn't take up much power and that's about it.

The way I calculated it is that the power supplies are <80% efficient, so actual power supplied can be 80% of 500W = 400W.
In benchmarks run by Tweaktown with an i7 and this card, it used 404W at peak at the powerpoint, that's why I thought a 500 supplying 400W max would be insufficient.
Maybe I have the wrong idea about the efficiency rating of PSUs

I go for something between 500 and 600 depending on the deal that I am getting on BF
 
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