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I though I was finished my first loop, but then........

post #1 of 23
Thread Starter 
Hey guys and gals, I could use some advice from this great community. I just finished building my first custom loop, I designed it to be an "overkill build". I bought a 900d and proceeded to put a 480 ut60 in the roof in push pull, another 480 ut60 in the basement in push and a monsta 240 in the basement as well in push pull. The water is being pumped by a swiftech 655 vario pump with ek pump top. So for all this rad space I'm cooling a 4770k with ek supremacy block, and 2 780ti classys with ek blocks as well. At idle my deltas are fine I think, 5c with 26c ambient temps. The problem is when the system is under load, deltas quickly rocket to just over 20c. From my reading in this great foum, it seems that ideal deltas for sli systems are 10-15c under load or am I mistaken? I think I've narrowed my problems down to one or two things. First my 480 and my 240 monsta are quite literally "sandwiched" together, I could see the issues with efficiency but could it actually cause temps to rise? Or second, am I expecting to much from my 655 vario? (speed setting 5) and should I then add a second in series? Or both?

Any help and advice would be greatly appreciated.

My system setup Warning: Spoiler! (Click to show)

My rad sandwich redface.gifWarning: Spoiler! (Click to show)
post #2 of 23
I'm still new to water cooling but ill try to help. If you dial back the pump any and notice a increase in temps then there might be a problem with flow to me it looks like you have the bottom rads sharing water in I would put them in series and see if that helps.
post #3 of 23
Well those 780's are hot. But 57* C on load? That's actually pretty good.

Keep in mind, if your ambient is 26*... That's a good temp you're getting.
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post #4 of 23
Rad sandwich is a bad idea. If you've ever put your hand in the airflow exiting a radiator, you know how hot it can get when the system is under load. Using that hot air as the intake for the second rad in a sandwich cripples its performance. Take out the 240, put the 480 it was sandwiched with on push/pull, and you will more than likely see some improvement. If you can figure out somewhere else to mount the 240 so all your rads get fresh air as intake, more the better.

This thread on another forum shows the best testing that I think has been done on rad sandwiches.
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post #5 of 23
Thread Starter 
Do you think removing the second set of fans from the 240 and putting both rads on pull, thus exhausting air from the case would be effective?


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post #6 of 23
There is something odd going on here it seems. In my system the Delta ranges from about 2.5C @ 800RPM at idle to about 9C @ 1300RPM at full load. That is only one graphics card but also much less radiator. Your system should be doing much better.

Airflow is important, arguably more important than adding more radiator space after you reach a medium size.
I would definately remove the bottom 240 or put it somewhere else, and have the top rad set to intake cool air. Even with those changes I can't see it making such a big difference.

Where are you measuring all the temps? Ambient and water?
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post #7 of 23
Thread Starter 
Quote:
Originally Posted by Jakusonfire View Post

There is something odd going on here it seems. In my system the Delta ranges from about 2.5C @ 800RPM at idle to about 9C @ 1300RPM at full load. That is only one graphics card but also much less radiator. Your system should be doing much better.

Airflow is important, arguably more important than adding more radiator space after you reach a medium size.
I would definately remove the bottom 240 or put it somewhere else, and have the top rad set to intake cool air. Even with those changes I can't see it making such a big difference.

Where are you measuring all the temps? Ambient and water?

I've got an xspc water temp plug at the bottom of my reservoir and I'm taking my ambient from an external thermostat on top of my desk. I guess I need to find somewhere to shoehorn a monsta 240 in to my system, I never woulda thunk a 900d would be too small.....
post #8 of 23
The monsta in the basement is a bad idea. Like others have said feeding it hot air is hurting performance. Honestly, for your build the two 480s is more than enough. Yank the monsta out and put two fans in its place exhausting the hot air.
I have a similar set up to you. I just have the two UT60 480 rads (only running in push) and my two gpus (4 gig 680s) only reach 40℃ and 41℃ for the two of them after hour long loops of valley or heaven.
Try letting that rig breath I am sure it will help :-)
Edited by badkarma3059 - 4/8/14 at 4:59am
post #9 of 23
Thread Starter 
Thanks for the advice guys, I'll try with just the 2 480's and go from there. I guess I'll have an extra rad kicking around until I feel like modding it into the 900d smile.gif
post #10 of 23
Keep us posted :-)
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