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Help with loop direction please.

post #1 of 12
Thread Starter 
Okay, so I'm adding another 5970 into my loop which means I need moar radiator, I'm PM'ing someone on another forum about a RX240 and I'm going to put it on the bottom of my HAF, thing is, I'm having a bit of trouble with the most efficient loop.

Here's what I've come up with:



NOTE: RS120 is optional, not sure if it'd be worth it.


Does that look right? Anything I've carelessly made a mistake of? I already have 5970, RX360, CPU and Pump/Res combo, just adding another 5970 and Rad (Or two).

Thanks, fr0st.
post #2 of 12
i would do this

post #3 of 12
^that setup would probably be ideal.

Loop order won't make much of a difference once the loop has reached equilibrium.
post #4 of 12
Think your 360 could do fine by itself but the additional 120 is just overkill. You're not getting that much more help.
post #5 of 12
A 360 alone wouldn't handle dual 5970's and a cpu very efficiently.
post #6 of 12
I would try out just using the 360 then add another rad if you need to
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by mongoloid View Post
A 360 alone wouldn't handle dual 5970's and a cpu very efficiently.
2 5970's at 900/1200?
A CPU @ 4.4GHz sucking in 1.45V?



I get 70's on my 920 as it is. When I add my next 5970 I don't wanna have to reduce my clock and lower my PPD and not help out my folding team as much.

Quote:
Originally Posted by Juggalo23451 View Post
I would try out just using the 360 then add another rad if you need to
RX240 + RS120 = RX360 (Martin from Skinnee labs said so in his experiments) so it'd be effectively the same as adding another RX360. I also want to keep it all internal.



Thanks for the help guys!
+rep to those who helped!
post #8 of 12
Quote:
Originally Posted by fr0st. View Post
2 5970's at 900/1200?
A CPU @ 4.4GHz sucking in 1.45V?



I get 70's on my 920 as it is. When I add my next 5970 I don't wanna have to reduce my clock and lower my PPD and not help out my folding team as much.

That's what I mean...an additional 240 wouldn't hurt.
post #9 of 12
Quote:
Originally Posted by fr0st. View Post
RX240 + RS120 = RX360 (Martin from Skinnee labs said so in his experiments)
Can you point me to that test please? Not doubting you, I would just like to read it.

I agree that you would do better with the 360 and 240, try that first before adding another 120. Also check that there is room for the 120 to fit, the existing 360 might come down too far for it.

Either loop order will be fine. If you have a flow rate of 1GPM, your 5970's are running at their full TDP (250W each) and all the heat is going into the water then the water will be slightly less than 2C warmer after passing through them. If this seems like a big deal to you then go with the loop order that diane suggested.

As I haven't got it out for a while, here is my graph of temperature rise against heat load for some flow rates:


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post #10 of 12
Thread Starter 
I have a Swifty MCP-655, pretty powerful, how much GPU would that get?

I just saw Martin comment on a OCN thread somewhere, I'll see if I can dig it up.

EDIT: http://www.overclock.net/water-cooli...120-rx240.html
Edited by fr0st. - 3/23/11 at 1:46am
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