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Switched from dual loop to single loop

post #1 of 24
Thread Starter 
I made this thread on Anandtech about a pump failing on me a while ago (before I joined overclock.net!)... It made me think twice about my setup and I decided to switch to a single loop system.

I made the switch from dual loop to single loop for various reasons:
  • it is more simple to deal with just 1 loop rather then 2
  • running a serial setup, so I have peace of mine of one pump fails (in dual loop, i had a pump fail. so this was very important to me)
  • things run cooler, you almost never use your cpu and gpu at max at the sametime. So what happens? the thing that needs more radiator, in a sense, gets it. The downside, is that the thing that doesn't, gets hotter
I'll just give you an idea of temps:
  • my previous setup was 2 MCP355's, 2 Loops... these temps are after the computer warmed up and was on for about 1 hour (ambients 25C)
    • idle (water temps: 35C):
      • -CPU ~44C
      • -GPU ~48C
    • load:
      • -CPU ~60C (water temps: 48C)
      • -GPU ~65C (water temps: 53C)
  • single loop, serial setup, 2 PMP-400's (still have 1 working MCP355 for backup)... these temps are after the computer warmed up and was on for about 1 hour (ambients 25C)idle:
    • idle (water temps: 35C):
      • -CPU ~40C
      • -GPU ~44C
    • load:
      • -CPU ~53C (water temps: 44C)
      • -GPU ~55C (water temps: 45C)
    • just a quick note, when the gpu is at load, the cpu temps are about 2-3C warmer then in the dual loop setup. Not a big deal at all.
I've got to say, I'm pretty happy with the single loop setup... temps are just awesome! Will post new pics soon...
post #2 of 24
Thats a nice drop it temps.

Ive always told people only one loop is better and I guess this is proof.
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post #3 of 24
Hey good to see you over here. I always suggest single loop systems for the exact reason you have found out. How do you have your pumps mounted? Any pictures of the overall system?
post #4 of 24
Thread Starter 
Quote:
Originally Posted by [AK]Zip View Post
Hey good to see you over here. I always suggest single loop systems for the exact reason you have found out. How do you have your pumps mounted? Any pictures of the overall system?
I have some pictures, but they are out of date (old dual loop setup). I mean they are almost identical w/ one less tube and a lot less clutter. I'll take some pictures when i get home today and post them up.

In terms of pump mounting, I have the Koolance RP-402X2 reservoir w/ 2 PMP-400 pumps w/ heatsinks on them. Despite all the horror stories, I was able to bleed it easily (computer was on it's back), insert in the bottom left, U connector on the bottom, and short plug.
post #5 of 24
very nice drops. i could really only see going to two loops if your running SLI and a cpu (like i run on a single loop). Watercooling is a new favorite thing on my pc. Glad to see you got amazing results!

If you want a few more C drops, put IC Diamond thermal compound on everything that has a block or heatsink. i saw 2-3C drop over artic silver.
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post #6 of 24
Thread Starter 
Quote:
Originally Posted by Tweak17emon View Post
very nice drops. i could really only see going to two loops if your running SLI and a cpu (like i run on a single loop). Watercooling is a new favorite thing on my pc. Glad to see you got amazing results!

If you want a few more C drops, put IC Diamond thermal compound on everything that has a block or heatsink. i saw 2-3C drop over artic silver.
I do run SLI (2 EVGA 480 FTW Hydrocopper) and a CPU (990x @ 4.5Ghz) on single loop now which prev were on 2 separate loops.

Will keep the IC Diamond Thermal Compound in mind when I do my next loop maintenance in a few months.
post #7 of 24
I'm just curious but what rads are you using? The reason I ask is that the water temps seem high to me.
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post #8 of 24
Thread Starter 
Black Ice GTX 360 Radiator http://jab-tech.com/Black-Ice-GTX-36...r-pr-3613.html
Black Ice GTX 240 Radiator http://jab-tech.com/Black-Ice-GTX-24...r-pr-3612.html

10C over ambient (at idle) is high? My air flow may not be the best either... here are a couple pics (this is when it was dual loop, but it has barely changed inside from what you can see), everything is intake except the 3 fans on the top radiator



Edited by Elganja - 6/6/11 at 7:50am
post #9 of 24
It's so obvious single loop is better. Makes me think that people who set up dual loops are stupid...
Thanks for posting your temps, it's a great proof.
Edited by PeL4 - 6/6/11 at 7:57am
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post #10 of 24
A delta-t of 10*C is fine based on what your watt load is. You can get it down a bit with better fans such as the gentle typhoon that have a high level of static pressure, but past that you are going about it correctly now.
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