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FSP Epsilon 80Plus 600W - unknown combined power for the 12V rails!

post #1 of 19
Thread Starter 
Hi. My friend has been running this PSU since 2009 now, and so far it has been powering an Intel Core i7-920, Gigabyte GA-X58A-UD3R, 4GB RAM each module of 2GB, ATI Radeon HD 4870 1GB, a HDD and an optical drive. Everything is at stock speeds but his PC is "almost" on 24/7, mostly used for gaming. He barely turns it off, that too only when he goes outside of city for a couple of weeks.

My question is, how much power on the 12V rail can we assume? AnandTech guess 420W, but that's more of a worst-case scenario. Can it do any better? I'm sure it can, but how much guaranteed I should expect? We need to know this so in case we upgrade his hardware.

Thanks!
Edited by noob360 - 11/16/12 at 11:31pm
post #2 of 19
LMGTFY:
http://www.anandtech.com/Gallery/Album/171#4
 
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post #3 of 19
Hardware Heaven's testing pulled up to 516 watts on the 12v rails, but they didn't try to pull more. As long as you're running single CPU + single GPU, you should be fine.
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post #4 of 19
I can't see how it'd be inadequate for a dual GPU setup - I might avoid furmark for daily use though.
 
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post #5 of 19
Thread Starter 
Quote:
Originally Posted by u3b3rg33k View Post

LMGTFY:
http://www.anandtech.com/Gallery/Album/171#4
It's not that easy. 575W? I doubt, that's why I came here.
post #6 of 19
If you won't take the label at it's word, then your only option is to load up the 12v rail until it OCPs, and there's your number.

You know how people figure out how much power a car "really" has when they doubt the mfg? they dyno it. you've just entered that ball-game, and unless you're willing to spend the time and money, there isn't an easy answer.

Anandtech didn't come up with that 420W out of nowhere either, they subtracted max 3.3 and 5v wattage from the max combined wattage: 575W-155W and got 420W. so if you really want to know, figure out how much 3.3 and 5v load you have, subtract it from 575, and you have an answer. Of course, that depends on your exact setup, so we can't give you that magic answer you want.

Ask yourself this, though - what uses the 3.3 and 5v lines these days? not much. CPUs have been fed off the 12V line for quite some time.
Edited by u3b3rg33k - 11/17/12 at 12:27pm
 
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post #7 of 19
Also, many power supplies (not sure about the Epsilon) use DC-DC converters. That means the 120v coming in is first turned into 12v, and from there the 5v and 3.3v rails derive their power from the 12v rail. That means the 12v rail has to provide the entire capacity for the 12v, 3.3v, and 5v.
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post #8 of 19

Epsilon units don't use DC-DC and are very basic (& cheap) designs.

 

The combined 12v wattage is 44A (528w.)


Though, some Epsilon units were rated at 600w for the 12v; they can't be trusted to put out that much.

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post #9 of 19
Thread Starter 
Quote:
Originally Posted by Tator Tot View Post

The combined 12v wattage is 44A (528w.)


Though, some Epsilon units were rated at 600w for the 12v; they can't be trusted to put out that much.
Thanks. You always some everything up in your one post. biggrin.gif Very helpful.
post #10 of 19
Quote:
Originally Posted by Tator Tot View Post

Epsilon units don't use DC-DC and are very basic (& cheap) designs.

The combined 12v wattage is 44A (528w.)


Though, some Epsilon units were rated at 600w for the 12v; they can't be trusted to put out that much.
Just curious, where did you get that number?
 
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