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Gtx 470 sli

post #1 of 11
Thread Starter 
advice needed. this its my pw supply
http://www.newegg.com/Product/Produc...82E16817371025

can handle my 2 gtx in sli with 3 monitors?
newegg pw suppy calc says i need like 777W.
should i buy an 850W?
thanks for any answer.
BiosFear
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BiosFear
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post #2 of 11
I would go with an 850 as the power drain at the socket on a GTX 470 single card is about 285W under load. Two would be double that for a 570W power pull under heavy load. Would go with the 850W for headroom with your PSU to make sure that it will handle everything. When you consider your i7 and your memory plus drives installed you are sitting right at 745W give or take so I think your best bet is - in the case of power supplies - bigger is always better.
post #3 of 11
The TP-750 is more than enough. It doesn't matter how many monitors are connected by the way.
And Newegg's power supply calculator is full of ****.

Quote:
Originally Posted by BodyShield View Post
I would go with an 850 as the power drain at the socket on a GTX 470 single card is about 285W under load. Two would be double that for a 570W power pull under heavy load.
First of all, power consumption never doubles going from single card to SLI. The power consumption of two GTX 470s at stock speeds tops out around 380W DC (as drawn directly from the PSU) in FurMark.

Quote:
in the case of power supplies - bigger is always better.
Definitely not. Getting a 850W unit here wouldn't be a big deal but it is unnecessary. Bigger is far from always better. This is the kind of logic that makes people get 1000W PSUs for a system that draws 100-130W at idle and 300W under load. Efficiency is usually ****ty under 10% load, so your power bill would be worse in this instance than if you had a more adequate PSU.
Edited by Shub - 1/3/11 at 12:36pm
post #4 of 11
An AntecTruepower 750watt can easily handle a high end quad and 2 GTX470s in SLi...maybe even three in triple SLi.

The AntecTruepower is actually a 900watt PSU underrated as a 750watt:

http://www.hardwaresecrets.com/artic...y-Review/766/8
post #5 of 11
Quote:
Originally Posted by Shub View Post
The TP-750 is more than enough. It doesn't matter how many monitors are connected by the way.
And Newegg's power supply calculator is full of ****.
I think Newegg's calculator assumes you're getting a crap/crap-medicore PSU that often overrates their wattage...whereas good companies with good lines of products tend to underrate their wattage.
post #6 of 11
Thread Starter 
thanks for all u answers!
BiosFear
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BiosFear
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post #7 of 11
I am having no problems with my sig rig at 750w
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post #8 of 11
I have run SLI cards for years until recently and their power draw is not reduced and is combinant. The reason I said this is that power draw at the socket is higher than the tested TDP for most cards. A card may say that it will pull 285W but really pull 330W - an example of this is the GTX 480. I have one and it does just that - it needs more juice than it claims it needs. And two cards doesnt double the draw no - but I like having the buffer personally and wouldnt run a Fermi SLI setup on anything less than an 800W PSU. And I dont use PSU calculators - they are crap. I use a multimeter and test voltages or a program like Furmark. The reason that NVidia recommends a 550W or better PSU for a GTX 470 is that a single card may only pull 215W according to the TDP specs, but the draw for the card may be closer to 230 or 240W. A manufacturer will build cards with slightly different specs and they may not perfectly match a manufacturers recommendations for wattage. Example of this two ASUS OC vid cards that are factory non-ref designs - I own both - they pull as much as 55W more juice than the stock. Will 700 or 750 work sure, but I personally wouldnt do it. I also said that before as it was a recommendation and not a you should do this - that is what I would do. I use larger PSUs cause I also overclock so the power demand from my cards and motherboard/cpu is higher. http://techreport.com/articles.x/18682/13 provides a realistic measurement of actual voltage loads on a "whole system" using a number of high end cards. BTW actual tests on a GTX 470 show the voltage pull at the socket is 286W and adding a second card throws your power draw from the SLI setup to 408-456W - my tests. And with a SLI setup bigger is better - with just about any setup - it is better to have more power than not enough so that cards arent underpowered. I am just partial to my 1200W Antec. And SHUB I agree with most of your post, but TDP says nothing for realistic measurements which is the way I am and I know for a fact that most newer vid cards pull more than stock max TDP. And I'm prepping my rig for triSLI 580 in two months so that would be why the 1200W PSU. The 480 was a gapfiller. See also - http://www.hardwarecanucks.com/forum...review-17.html about power consumption of 470 in SLI.
Edited by BodyShield - 1/3/11 at 2:25pm
post #9 of 11
I wasn't basing my post on TDP rating -- frankly I don't even know the TDP rating of those cards, but I do know what they actually consume (in terms of power drawn from the PSU -- not from the wall, which is kind of irrelevant) Like I said, two GTX 470s will pull about 380W DC from the PSU while running Furmark. This is consistent with the 456W figure you measured at your wall, assuming about 85% efficiency.
post #10 of 11
Quote:
Originally Posted by BodyShield View Post
I have run SLI cards for years until recently and their power draw is not reduced and is combinant. The reason I said this is that power draw at the socket is higher than the tested TDP for most cards. A card may say that it will pull 285W but really pull 330W - an example of this is the GTX 480. I have one and it does just that - it needs more juice than it claims it needs. And two cards doesnt double the draw no - but I like having the buffer personally and wouldnt run a Fermi SLI setup on anything less than an 800W PSU. And I dont use PSU calculators - they are crap. I use a multimeter and test voltages or a program like Furmark. The reason that NVidia recommends a 550W or better PSU for a GTX 470 is that a single card may only pull 215W according to the TDP specs, but the draw for the card may be closer to 230 or 240W. A manufacturer will build cards with slightly different specs and they may not perfectly match a manufacturers recommendations for wattage. Example of this two ASUS OC vid cards that are factory non-ref designs - I own both - they pull as much as 55W more juice than the stock. Will 700 or 750 work sure, but I personally wouldnt do it. I also said that before as it was a recommendation and not a you should do this - that is what I would do. I use larger PSUs cause I also overclock so the power demand from my cards and motherboard/cpu is higher. http://techreport.com/articles.x/18682/13 provides a realistic measurement of actual voltage loads on a "whole system" using a number of high end cards. BTW actual tests on a GTX 470 show the voltage pull at the socket is 286W and adding a second card throws your power draw from the SLI setup to 408-456W - my tests. And with a SLI setup bigger is better - with just about any setup - it is better to have more power than not enough so that cards arent underpowered. I am just partial to my 1200W Antec. And SHUB I agree with most of your post, but TDP says nothing for realistic measurements which is the way I am and I know for a fact that most newer vid cards pull more than stock max TDP. And I'm prepping my rig for triSLI 580 in two months so that would be why the 1200W PSU. The 480 was a gapfiller. See also - http://www.hardwarecanucks.com/forum...review-17.html about power consumption of 470 in SLI.
In my experience this is really the opposite of the truth in real world applications. Especially for gaming you'll be lucky to use 70% of your systems maximum power consumption.
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