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Do I have enough power for a GTX 470?

post #1 of 11
Thread Starter 
I know on the website it says a minimum of 550 watts for the GTX 470, but I've overclocked my CPU and I'm not sure if that affects the amount of power I need.

I have overclocked my i5-2500k to 4.5GHz @ 1.328v, I have a 550w PSU with 44 amps on a single rail (it's also 80 PLUS BRONZE certified if that makes any difference.) It's the XFX PRO550w to be exact. I have 1 standard hard drive, 1 standard DVD burner, a TV tuner card, and four 120mm fans counting the CPU fan.

Any help is greatly appreciated, thanks!
Edited by EliteGamer83 - 7/31/11 at 8:53am
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post #2 of 11
I run a GTX480 off of a HX520 psu and a 2500k
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post #3 of 11
Yer that's fine. You might be pushing the PSU past 80% so it will loose efficiently but it will run fine.

If you had a HX750 say, the pc would use less power, therefore cost less on bills ever time. only at full load though.
Edited by andrewmchugh - 7/31/11 at 8:56am
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post #4 of 11
Thread Starter 
Thanks for the replies! Quick question though, will this affect the life of my PSU though if I'm running it so close to it's limits?

Also, just for future reference, how do you calculate how much wattage your CPU is sucking up when it's overclocked?
Edited by EliteGamer83 - 7/31/11 at 8:59am
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post #5 of 11
Quote:
Originally Posted by andrewmchugh View Post
Yer that's fine. You might be pushing the PSU past 80% so it will loose efficiently but it will run fine.
He won't be losing much efficiency at all. You lose efficiency more when you are at idle.

http://www.jonnyguru.com/modules.php...tory2&reid=225
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post #6 of 11
Quote:
Originally Posted by EliteGamer83 View Post
Thanks for the replies! Quick question though, will this affect the life of my PSU though if I'm running it so close to it's limits?

Also, just for future reference, how do you calculate how much wattage your CPU is sucking up when it's overclocked?
On a crappy power supply, yes. However, your power supply is actually rated for sustained power output and at real world temperatures. Stop stressing
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post #7 of 11
Quote:
Originally Posted by VW_TDI_02 View Post
He won't be losing much efficiency at all. You lose efficiency more when you are at idle.

http://www.jonnyguru.com/modules.php...tory2&reid=225

Off the site you quoted

222.7W/262.2W @ 85%

555.3W/676W @ 82%

Efficiency of that PSU is a curve on a graph.
Edited by andrewmchugh - 7/31/11 at 9:43am
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post #8 of 11
Quote:
Originally Posted by andrewmchugh View Post
Off the site you quoted

222.7W/262.2W @ 85%

555.3W/676W @ 82%

Efficiency of that PSU is a curve on a graph.
So you're dropping 3%?? Both of those are above 80% but compare that to 76% at idle.
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post #9 of 11
Yeah, after the CPU overclock, it means that if your CPU is fully loaded and everything else running, you have about 400W left to run your graphics card.

Actually, more than 400W, going by reviews. The below shows system power consumption (AC, including losses in the power supply AND a GPU idling) with an overclocked i5-2500k running at full tilt.
http://www.xbitlabs.com/articles/cpu..._12.html#sect0

Your power supply is full of 105C-rated Japanese Chemi-Con capacitors, as opposed to some cheapy brands with suspect composition that are more prone to exploding/leaking. You shouldn't be worrying about running the power supply hard, which you probably won't be anyway.
post #10 of 11
My friend runs a Q9550 OC and a GTX 275 OC off of th 450w version.
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