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How do I pick a power supply?

Last response: in Components
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September 19, 2010 9:55:50 PM

Hello,
Can anyone suggest a good PSU for this build?

ASUS p7p55de-lx
Core i7-870
Corsair 8GB 1333
HD-5770 1GB
1 OCZ Vertex2 + 2 WD 7200RPM
2x200mm + 1x120mm case fan
CM Hyper 212+

I would probably try OC to 4Ghz. How do you determine which PSU is suitable?

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a b ) Power supply
September 19, 2010 10:27:47 PM

There are calculators out there you can google, but a 450W is enough for 1x5770, like:

Corsair 450W $55 http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007657%20600014019%20600014060&IsNodeId=1&name=450W

I didn't like any of the 550W value choices, so here's a 620W

Seasonic 620W http://www.newegg.com/Product/Product.aspx?Item=N82E16817151096

that will work, with adapters. They make a 650W with the right connectors for 2x5770 for $10 more.
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a b ) Power supply
September 19, 2010 11:07:51 PM

A qulity 450W PSU with one PCIe connector is a good choice for running your system. If you go for a 550W PSU with two PCIe connectors you will be able to do CF with two 5770 if needed.

Here you have some good options for you:

ANTEC High Current Gamer 520W (by Seasonic)
ANTEC TruePower New 550W (by Seasonic) (modular)
Reviews: http://www.realhardtechx.com/index_archivos/Page673.htm
CORSAIR VX450 550W (by Seasonic)
CORSAIR VX550 550W (by CWT)
Reviews: http://www.realhardtechx.com/index_archivos/Page447.htm
ENERMAX Liberty Eco 500W
Reviews: http://www.realhardtechx.com/index_archivos/Page567.htm
SEASONIC S12II Bronze 520 W
Reviews: http://www.realhardtechx.com/index_archivos/Page678.htm
THERMALTAKE Toughpower QFan 500W (by CWT) (modular)
Reviews: http://www.realhardtechx.com/index_archivos/Page680.htm
COOLER MASTER Silent Pro M 500W (by Enhance Electronics) (modular)
Reviews: http://www.realhardtechx.com/index_archivos/Page364.htm

In the RealHardTechX PSU Review Database you will find useful information and qualified reviews about a lot of PSUs. I highly recommend it.
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September 20, 2010 4:13:55 AM

if you'd like a little more cushion in your psu, an Antec Earthwatts 650 is pretty good
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a c 144 ) Power supply
September 20, 2010 4:18:37 AM

A good 550 - 600 watt PSU will power a system with any CPU and single GPU video card. So I recommend a Corsair 550VX for such a mainstream system.
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September 21, 2010 11:47:41 PM

Thanks all. What is the life expectancy of PSU?

I'm looking at the Antec 650w, but OCZ has a really cheap one 800w.
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September 22, 2010 3:10:41 PM

Dont go for price over quality. if someone is selling a 800w for cheaper than another firms 650w then its becasue its wa*k basically. ive got the corsair tx 650 which would be plenty for you if your are planning to OC the cpu and even the card. i had a 5770 on a 500w supply on stock cpu and gpu settings so 650w good make like corsair will be perfect. only buy over 650w if you are planning on future upgrades, otherwie itl be wasted.

for copmparison i run a 5970 with te corsair tx650 at stock cpu and gpu settings and thats plenty so with a 5770 youl be fine.
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September 22, 2010 3:14:07 PM

divac said:
Thanks all. What is the life expectancy of PSU?

I'm looking at the Antec 650w, but OCZ has a really cheap one 800w.


Cheap cause it sucks

Id suggest Corsair 650TX as I trust Corsair and own a 750TX myself
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a c 248 ) Power supply
September 22, 2010 3:14:30 PM

Here are the official ATI power supply requirements for the ATI Radeon HD 5770 and 5750 video cards:


450 Watt or greater power supply with one 75 watt, 6-pin PCI Express® power connector recommended

600 Watt or greater power supply with two 75 watt, 6-pin PCI Express® power connectors for ATI CrossFireX™ technology in dual mode

The recommendations are for an entire pc system.

Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty (in the USA).
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September 22, 2010 7:18:38 PM

Thanks everyone. I went with Corsair 650tx. Newegg has it for $60 AR, including tax and shipping. Not to mention it has 1000+ reviews 5 eggs...
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September 22, 2010 7:48:52 PM

i'm one of those 5 egg reviews if it doesn't say corsair ocz or nzxt i wouldn't put it in a comupter i build
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September 23, 2010 10:18:35 AM

A fine choice my friend !!
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!