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2 Quick Questions, Rad requirement for 2x GTX 470s, and is it better to push or pull?

post #1 of 10
Thread Starter 
As the title says I just have 2 quick questions.
1. This is a question I am asking for a friend. To water cool 2 GTX 470s would a 240 rad work? If so which is the thinest model possible? The cards will be overclocked.

2. This is a question about my rig. I have 2 panaflos I put on a GTX240 Rad. Will I loose airflow/see a performance decrease if I use them to pull instead of push?

Any help on ether question would be great. As always helpful posts get +Rep. Thanks!
post #2 of 10
I always prefer to push my air through the rad but pulling works too its a matter of looks and convenience imo. You are looking at 420W a card for cooling so you need a rad that can dissipate 840 W. You will need at least a 360 thick rad to cool them both effectively.

The big down side to the 470's and 480's is the major power consumption requirements they carry with them. Which means more heat to disperse through your rad.

Edit: Are the over volted or over clocked via software if they are both over volted you will need a 480 rad.
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post #3 of 10
I'd say a 240 rad would be enough, if you take a tiff one (like the RX240). However, if you want a thin radiator, you'll need a 360 (like the RS360).

I don't these fans but here how it normally works:
  • Low RPM fans: Pull
  • Mid RPM fans: Push or Pull
  • High RPM fans: Push

Hope this helps!
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post #4 of 10
I can guarantee that a rs 240 will not cool both of his overclocked or volted 470's unless its 1 240 per card.

Here is a thread on here for reference on the rad heat dissipation:

http://www.overclock.net/water-cooli...gs-rads-4.html

A RX360 is enough for a cpu at 4.0 + and a 480 which tosses out more heat than a 470. If you lok at other people builds who sli Fermis they always have a 360 +120 or more for rads.
Edited by Arksniper - 3/3/11 at 9:18pm
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post #5 of 10
Thread Starter 
Thanks everyone for the responses I will let my friend know. He will probably be overvolting via software. Didn't notice the huge power requirements those had.
post #6 of 10
Quote:
Originally Posted by Arksniper View Post
I can guarantee that a rs 240 will not cool both of his overclocked or volted 470's unless its 1 240 per card.
That's why I said a RX240.

For me, I'm gonna cool my CPU + 2 GPUs with a RS360 and a RX120. I've been assured by CharlieHorse55 that it's gonna work fine. And trust me, he knows what he's talking about.
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post #7 of 10
Quote:
Originally Posted by rockcoeur View Post
That's why I said a RX240.

For me, I'm gonna cool my CPU + 2 GPUs with a RS360 and a RX120. I've been assured by CharlieHorse55 that it's gonna work fine. And trust me, he knows what he's talking about.
Yes I saw but a 240 RX still does not have enough heat dissipation in it to cover x2 470's a RX 240 can handle about 1.25-1.5 Fermis for cooling.

Even you yourself have the equivalent to a 480RX which is enough to hand 2 Fermi's and a cpu +some.

So the op needs at least a 360RX if he doesn't plan on adding anything else later. Also a RS 360 = RX 240 in terms of cooling. Take a look at the posts in the link I provided there are graphs there that have the answers. 5th page 2nd from bottom.
Edited by Arksniper - 3/3/11 at 9:25pm
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by Arksniper View Post
I can guarantee that a rs 240 will not cool both of his overclocked or volted 470's unless its 1 240 per card.

Here is a thread on here for reference on the rad heat dissipation:

http://www.overclock.net/water-cooli...gs-rads-4.html

A RX360 is enough for a cpu at 4.0 + and a 480 which tosses out more heat than a 470.
RX360 for cpu only? seems a little extreme since my rs360 works without a problem
73 load @ 4.35 1.475 vcore
post #9 of 10
Depends on what fans you are running on the 240. If you go for high speed fans, don't want the best temps and are not over clocking the cards then you can use a 240 for 2 GTX 470s, you will just need to run fans at about 2k RPM plus under full load.

As for the difference between push / pull, Martin's test seems to be the seminal work on the matter. With high speed panaflows you will get better results in push.

Edit:

Test results to back up the 240mm rad being sufficient for 2 GTX 470s:



2 GTX 470s at full load = 430W
Running fans at ~2500 RPM will dissipate 430W with a delta of 10C. It will work, but it will not work well.


Graph from another of Martin's tests
Edited by GingerJohn - 3/3/11 at 9:28pm
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post #10 of 10
Quote:
Originally Posted by GriZzlEnLS View Post
RX360 for cpu only? seems a little extreme since my rs360 works without a problem
73 load @ 4.35 1.475 vcore
I plan on adding my 5970 to the mix later this month/next month so i need the extra rad for my upgrade.

So as the graph shows a 240 would work but you couldn't max the cards and you wouldn't get the best temps which is why I first suggested at least a RX360.
Edited by Arksniper - 3/3/11 at 9:31pm
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