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Is this PSU good enough for my build?

Last response: in Components
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April 1, 2012 11:55:43 PM

I am not sure whether this antec 650w PSU will be enough for my build.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Here's the rest of my planned build:
-Rosewill Gear x3 Case
-Sony Optical Drive
-WD Caviar Black 750GB Hard Drive
-Intel i5 2500k Processor
http://www.microcenter.com/single_product_results.phtml...
-ASRock Extreme3 Gen3 Mobo
http://www.microcenter.com/single_product_results.phtml...
-Kingston HyperX blu 8GB DDR3-1333 Dual Channel Memory Kit
http://www.microcenter.com/single_product_results.phtml...
-Cooler Master Hyper 212+
http://www.amazon.com/Cooler-Master-Hyper-Sleeve-RR-B10...
-Sapphire Radeon HD 7850
http://www.amazon.com/Sapphire-Radeon-PCI-Express-Graph...

I want to be able to overclock and perhaps CF 7850s.

More about : psu good build

a b ) Power supply
April 2, 2012 12:38:04 AM

Yes it probably can, but I would go higher in anticipation of the crossfire. Also, for a build of this level you might consider a silver or gold certified PSU. The PSU is not the place to skimp!

Suggestion: $129 CORSAIR Professional Series HX750 (CMPSU-750HX) 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Active PFC Power Supply http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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April 2, 2012 1:23:13 AM

Excuse my ignorance, but what does a silver or gold rated power supply do better than a bronze one?
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a b ) Power supply
April 2, 2012 1:23:15 AM

crossfire that system should draw about 550w maximum so a 650w psu should be fine...

also look at the ripjaw ram rather than kingston... kingston are very much a budget ram maker now and often have much higher latencies than there competitors at the same price... they have been trading off past glory's for a few years now but people are slowly learning that there just not that good any more.
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a b ) Power supply
April 2, 2012 1:29:53 AM

darkclownjoe said:
Excuse my ignorance, but what does a silver or gold rated power supply do better than a bronze one?

it denotes higher efficiency 80w bronze for instance will likely give 80%-85% efficency load on 120v power line, while an 80% silver will give 80-85% efficient at 120v but over a much broader percentage ove the psu's power range...
if your in the uk they you will get even better numbers as we run on 240v which increases efficiency even further.
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April 2, 2012 1:39:58 AM

Thanks, I think I get it now.

For the RAM, will I really be able to tell the difference?
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a b ) Power supply
April 2, 2012 1:41:19 AM

darkclownjoe said:
Excuse my ignorance, but what does a silver or gold rated power supply do better than a bronze one?


As indicated, the rating is for efficiency. Lower efficiency models generate more heat/waste per watt. Unofficially its sometimes useful as a general quality measure -- it typically takes higher quality components to make a 98% efficient PSU than it does a 80% one. Also in my opinion, manufacturers put a little more care into higher performance parts that they expect will be tested to the limits.

I have a gold rated Seasonic X650 and the thing is awesome. It rarely needs the fan running, and even under load it doesn't generate heat or noise. I think that this kind of quality is worth it in a crossfire/overclocking machine that will get hot.
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Best solution

a c 1203 ) Power supply
April 2, 2012 4:40:32 AM

For a system using a single Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 24 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

For a system using two Radeon HD 7850 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 32 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

The Antec EarthWatts Green Series 650W (EA-650), with its combined +12 Volt continuous current rating of 54 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7850 or even with two Radeon HD 7850 graphics cards in 2-way CrossFireX mode.

There is ample spare capacity to handle any overclocking of the CPU and/or GPU(s) you may want to attempt.
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April 2, 2012 4:43:34 AM

Wow! Thanks for the extremely easy to read response. You answered all my questions!
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April 2, 2012 4:43:44 AM

Best answer selected by darkclownjoe.
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a b ) Power supply
April 4, 2012 9:39:47 PM

ko888 said:
For a system using a single Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 24 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

For a system using two Radeon HD 7850 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 32 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

The Antec EarthWatts Green Series 650W (EA-650), with its combined +12 Volt continuous current rating of 54 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7850 or even with two Radeon HD 7850 graphics cards in 2-way CrossFireX mode.

There is ample spare capacity to handle any overclocking of the CPU and/or GPU(s) you may want to attempt.

kool .... ;) 
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