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Is this PSU good enough for my build?

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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...
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.
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.
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?
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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a c 1108 ) Power supply
April 2, 2012 4:40:32 AM
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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.
April 2, 2012 4:43:34 AM

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

Best answer selected by darkclownjoe.
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 .... ;) 
!