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Can my PSU handle 580 SLI? - Page 3

post #21 of 33
Quote:
Originally Posted by prjindigo View Post
http://www.bit-tech.net/hardware/gra...x-580-review/8

Looks like they're saying it will pull 363w under full load. Sounds very right to me.

363+363 is seven hundred... on the graphics cards alone.

Rule of thumb: Five hundred per card, three hundred per motherboard.

I will tell you once... NEVER SKIMP ON POWER SUPPLY.
In my opinion I AGREE. Oww sorry I must NOT say in my opinion in this thread
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post #22 of 33
Quote:
Originally Posted by prjindigo View Post
http://www.bit-tech.net/hardware/gra...x-580-review/8

Looks like they're saying it will pull 363w under full load. Sounds very right to me.

363+363 is seven hundred... on the graphics cards alone.

Rule of thumb: Five hundred per card, three hundred per motherboard.

I will tell you once... NEVER SKIMP ON POWER SUPPLY.
It can't work that way due to scaling (so, it's not 363W+363W because scaling results in the 2nd card pulling quite a bit less power).

Here's a power consumption test with two GTX 580s in the SLI configuration under extremely full load (the reading was taken at the wall outlet):

http://www.guru3d.com/article/geforc...-sli-review/14

With both cards under the fullest possible load, the power supply ended up pulling 719W from the wall. If we say that the PSU was 85% efficient during this power draw, then we could say that the entire system pulled about 611W from the power supply. If we say that the PSU was 80% efficient, then we could say that the entire system pulled 575W. Or if it were 90% efficient, then that would mean the PSU pulled 647W.

So this is why even a quality 750W would be ok.


Quote:
Originally Posted by CaPoX View Post
In my opinion I AGREE. Oww sorry I must NOT say in my opinion in this thread
When talking about these kind of things, opinions don't matter because all that matter are facts.

For example: I can't say that it's my opinion that a 750W would be able to do it because that can't be based on an opinion. It has to be based on fact.

Basing statements in this context is like building a house on sand. However, basing statements in this context on facts is like building a house on extremely solid ground with a properly constructed cement foundation.
Edited by TwoCables - 4/7/11 at 5:08pm
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post #23 of 33
Quote:
Originally Posted by TwoCables View Post
When talking about these kind of things, opinions don't matter because all that matter are facts.

For example: I can't say that it's my opinion that a 750W would be able to do it because that can't be based on an opinion. It has to be based on fact.

Basing statements in this context is like building a house on sand. However, basing statements in this context on facts is like building a house on extremely solid ground with a properly constructed cement foundation.
Come on man focus on your wife or find your sense of humor....
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post #24 of 33
except a 750 watt supply almost never pushes 750 watts of 12v

Who told you that "scaling" which is how much more effect you get from adding a second card has anything to do with how much power that second card pulls?

So you're advising someone to equip a system that will pull 715 watts 12v with a power supply that, when brand new and on the ball only produces 750 watts? That's like advising people to rely on the tested minimum stopping distance when driving.

What we're saying is that 650 is NOT enough of a supply.
I generally use a 20% margin when I can and also buy as much supply as I can afford.

If you're saying to get a 750watt supply for 715watts consumption I have one thing to say to you: Don't stand behind your advice.
post #25 of 33
Quote:
Originally Posted by prjindigo View Post
except a 750 watt supply almost never pushes 750 watts of 12v
There are many 750W units that have a +12V capacity of 744W.

Quote:
Originally Posted by prjindigo View Post
Who told you that "scaling" which is how much more effect you get from adding a second card has anything to do with how much power that second card pulls?
Nobody. I just know it from past experiences both in my home and here on OCN. Due to scaling, the 2nd card never draws the maximum power that a single card would pull by itself because the 2nd card is not simply doubling the graphics processing power. So, if NVIDIA says "215W" for a card, then we can't say "then that's 215W+215W".


Quote:
Originally Posted by prjindigo View Post
So you're advising someone to equip a system that will pull 715 watts 12v with a power supply that, when brand new and on the ball only produces 750 watts? That's like advising people to rely on the tested minimum stopping distance when driving.
Nope. That 719W was measured at the wall outlet. This means that if the power supply was 85% efficient during that power draw at the wall, then the system was pulling about 611W from the power supply. Does that make sense? The only way a 719W power draw at the wall outlet could mean that the system was pulling 719W from the power supply is if we could use a 100% efficient power supply for this test of theirs.


Quote:
Originally Posted by prjindigo View Post
What we're saying is that 650 is NOT enough of a supply.
I generally use a 20% margin when I can and also buy as much supply as I can afford.
To each their own, but I prefer to know everything I can instead of guessing.


Quote:
Originally Posted by prjindigo View Post
If you're saying to get a 750watt supply for 715watts consumption I have one thing to say to you: Don't stand behind your advice.
Again: the 719W was measured at the wall. That means the power supply was pulling 719W from the wall due to what the system was pulling from the power supply. That's why we say that if the power supply were 85% efficient during that 719W power draw from the wall outlet, then the system was pulling about 611W from the power supply.

To illustrate this even further: if the power supply were 95% efficient during that 719W power draw from the wall outlet, then we could say that the system was pulling 683W from the power supply.

So yes: a quality 750W power supply should be enough. However, many people prefer to have a quality 850W for extra headroom which is absolutely fine.
Edited by TwoCables - 4/7/11 at 5:38pm
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post #26 of 33
Sorry to jump in the middle of this fine conversation but my signature rig uses 850 watts while folding. This is not an opinion but a fact guys. I hope it help the op make a decision.
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post #27 of 33
your psu is fine
post #28 of 33
Quote:
Originally Posted by Desert Rat View Post
Sorry to jump in the middle of this fine conversation but my signature rig uses 850 watts while folding. This is not an opinion but a fact guys. I hope it help the op make a decision.
850 watts while folding! Ok, this is a great number to work with:

850W at the wall with 85% efficiency equals about 722.5W of power that the entire system is pulling from the PSU.
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post #29 of 33
Quote:
Originally Posted by prjindigo View Post
except a 750 watt supply almost never pushes 750 watts of 12v

Who told you that "scaling" which is how much more effect you get from adding a second card has anything to do with how much power that second card pulls?

So you're advising someone to equip a system that will pull 715 watts 12v with a power supply that, when brand new and on the ball only produces 750 watts? That's like advising people to rely on the tested minimum stopping distance when driving.

What we're saying is that 650 is NOT enough of a supply.
I generally use a 20% margin when I can and also buy as much supply as I can afford.

If you're saying to get a 750watt supply for 715watts consumption I have one thing to say to you: Don't stand behind your advice.
Herp I derp derp. Did you even read his post right?

Now lets have SOME MATH

Ok so the whole PC draws 719w from the wall under load. The PC idle power draw is 237. Minus those two and you get 482w, now add the two GPU's idle consumption (this does scale 100%, 20x2=40w) So the GPU's are pulling 522w from the wall.
Now, lets factor in the gold rated efficiency (89%)
(522*89)/100 = 464w from the GPU's.
Now a overclocked i7 + other stuff would equal roughly 275w. (not from wall)
So 464 + 275 = 739w total.

So a good quality, gold rated 750 watt (such as the AX750) should run the GTX 580's fine. No overclocking, on the GPU and no extreme overclocking on the CPU. But it will work.
Any more questions?
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post #30 of 33
It's faster to do the math like this:

90%: wattage multiplied by .90

85%: wattage multiplied by .85

80%: wattage multiplied by .80

etc.



That way, you don't have to divide by 100 after.

So, 719W multiplied by .85 results in that 611W I got earlier (611.15W). It's the same result as 719*85/100, only with a little less work.
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