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Switched from dual loop to single loop - Page 2

post #11 of 24
Thread Starter 
Quote:
Originally Posted by [AK]Zip View Post
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.
thanks skip... btw, I'm heeding your advice. Switching to distilled water + biocide + coil for safe measure. Gonna tear it down today for some cleaning. Will take pictures of what I find.

also going to switch to ic diamond thermal compound
Edited by Elganja - 6/6/11 at 8:00am
post #12 of 24
I can understand how a single loop is better but why did you get worse temps in a dual loop?
post #13 of 24
The IC Diamond does a good job transferring heat, but I don't think I will use it again. As many others have found it seems to work like sand paper and removes the lettering of the cores.

Indigo Xtreme is best, but if you want something more straight forward I would go with Prolimatech PK-1 or even the good ol Arctic Cooling MX-2.

I look forward to see what you find when opening and cleaning everything. The dead pump I received was not very happy based on what was inside.
post #14 of 24
I was just curious because I'm massively over radded for my heatload but get a water to load CPU temperature delta of around 30ºC and yours seems to be around 12ºC with a 990X at 4.5GHz.

E.g of my temps

Ambient 20º
Idle Water temp 22º
Load Water temp 24º
CPU Load temp 56º

I must be doing something wrong.
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post #15 of 24
no, don't mix temperatures.
The one you mention is your CPU temp delta, and the one OP mentioned is water temp delta.
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post #16 of 24
This could be where I'm getting confused but I'll show the comparisons

Elganja - CPU ~60C (water temps: 48C)

Big Elf - CPU ~56C (water temps: 24C)
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post #17 of 24
single loop is definitely better of you combine the total water volume in your loop into one as there is more water able to absorb heat.
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post #18 of 24
Quote:
Originally Posted by Elganja View Post
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...
I to am curious on the water temps.. my water temps are 27C with ambients around 22C and my fans ( GT AP-15 push only ) are only at 50% cpu temps idle are 35C...so that does seem high to me as well ( I have a single loop as in my link )
post #19 of 24
Thread Starter 
Quote:
Originally Posted by Hard Line View Post
I to am curious on the water temps.. my water temps are 27C with ambients around 22C and my fans ( GT AP-15 push only ) are only at 50% cpu temps idle are 35C...so that does seem high to me as well ( I have a single loop as in my link )
our systems are not equivalent. I have 2 480 ftw's which produce a lot more heat then your 1 5870. In addition to that, you are running a 480 and 240 radiator while I am running a 360 and 240.

so ... you have more radiator and less watt's running through your system. that is why our delta's, and water temp's are a bit different
post #20 of 24
I am really struggling to understand this.

The difference between your water temps and CPU temps at load with the CPU on a single loop was 12ºC at 4.5GHz? Yet my system only has a 12ºC difference between water temps and CPU load temps at stock settings and a 32ºC difference at 4.2GHz.

If I turn my fans down so that water temps rise then my CPU temps increase by a corresponding amount.
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