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What can I do to lower temps?

post #1 of 14
Thread Starter 
Well, right up until I added a third card I had really good temps and could run the fan speeds really low without effecting temps. I am running three 7950s with Koolance blocks in series. I have an alphacool UT60 420 with push/pull arctic cooling F14 fans and a Monsta 240 with push/pull GT2150s. Since I added the third card it seems like I have to really crank the fan speeds to hope that I get near what I did with two cards. I also run a slightly lower oc too.

What could I do to lower temps? I did notice that when temps start to rise that my tubing does get warm. Could this be a flowrate issue? I would have thought that an mcp355 would be enough for this loop. Should I try some different fans on the 420?

Here is a quick pic of my loop.


Edited by BababooeyHTJ - 9/23/12 at 1:31pm
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post #2 of 14
At full GPU/CPU load....what is the ambient temperature in the case with the side panel on....and off?
What is the ambient temperature in the room?
    
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post #3 of 14
I've seen a few WC systems use 2 rads in there case 1 like the one you have at the top and a single fan rad at the bottom between the last gpu and the res. sucking the cool air off the bottom panel/floor board might do the trick. But ya I would still have to ask about the max temp. idle temp. and ambient temp of the room to get a better idea of what we are talking about in what your trying to do.
post #4 of 14
You're never gonna get enough cooling with that setup. There are some things you can do to improve it, get better fans, or raise your flow, but at the end of the day you have too much of a heat load.

At max clocks, you have around 1000w load with only 600mm of rad surface. In my long experience of running quadfire, achieving a 1 to 1 ratio between power draw and rad surface has given me the temps I desire. You say you're overclock is not that high, and I can see why it wouldn't be. wink.gif

My rig at max clocks pushes well over 1600w and I have 1800mm of rad surface backed up by a lot of pump, 3 35x. My gpus don't break 50c maxed out.
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post #5 of 14
Thread Starter 
Temps aren't why I don't run the oc higher. Its my UPS. It cries when I start to draw more than 860w so I stick with 1100mhz. I don't get the need to throw that dig in. rolleyes.gif I doubt that an extra overclock would be at all noticeable so I'm not too concerned about that. My point was that with two cards each card had a higher heat load which makes me question flow rate.

I'm just wondering what I can do to improve my temps. At 1100mhz they aren't bad if I crank the fan speeds which I would like to avoid. I'm just surprised to see such a large difference when adding a third card. The rads seemed to have a fair amount of overhead when running two cards. That makes me question flow rate. I don't know if I should be. I'm sort of considering picking up an mcp35x, running my cards in parallel and turning down the pump speed. That could make no difference for all that I know. Based on what I've heard none of the blocks that I am running are supposed to be all that restrictive.
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post #6 of 14
It wasn't meant to be a dig, it's that i understand why you might not push it hard given your situation of being under sized on rad surface.

I had trifire 7970s before with the same amount of rads and i was never happy with the temps. Regarding the pump, i would add a second 355 instead of 35x since your running series double the flow would be better. A single 35x is only slighty better so that wouldn't give you the flow gains your looking for. I was going to mention going parallel but seeing as how your already tapped for flow that wouldn't help. That aside i still think you are really short on rads.
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post #7 of 14
Thread Starter 
I was considering possibly pulling the drive bay and replacing the 240 with a 360. I really don't want to pull my drive bay though. I do run two mechanical hdds.

After a second 355, top, res, and heatsink I think that a 35x2, heatsink, and swiftech res might not cost much more. I was considering going that route.

Wouldn't going parallel at least up the flowrate through the rads? Or is the flowrate through the blocks what is killing me? Probably a bit of both.
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post #8 of 14
post #9 of 14
Quote:
Originally Posted by BababooeyHTJ View Post

I was considering possibly pulling the drive bay and replacing the 240 with a 360. I really don't want to pull my drive bay though. I do run two mechanical hdds.
After a second 355, top, res, and heatsink I think that a 35x2, heatsink, and swiftech res might not cost much more. I was considering going that route.
Wouldn't going parallel at least up the flowrate through the rads? Or is the flowrate through the blocks what is killing me? Probably a bit of both.


The three gpu in series hurts but if you already have undesirable gpu temps, going parallel will make the gpu temps go up because you're getting less flow to the individual blocks. A 35x2 is a solid move if you go that route.
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post #10 of 14
Thread Starter 
True but it seems like a heat buildup issue since temps slowly get worse until I finally turn up the fans a bit. Even the tubing gets warm. Would pushing more water through the rads help to dump the heat any faster?

I think you are right that more rad space would be the biggest help. I may pick up a 360 and see what happens. If I turn the drive cage sideways I may be able to make that work. Should help a bit, I hope.
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