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Results
I've only measured temperature in 3 points: in the CPU with Asus Probe (program provided by Asus taht gives temperatures in the motherboard and in the processor), in the waterblock cooling water (with probe installed) and in the air.
The cooling water temperature has been very stable 10 ºC under the CPU temperature.
Cooling water temperature has been 9 ºC over ambient air temperature with the fan at 6,3 V. At this tension the fan makes little noise but if the ambient is very silent it can be bothering.
Putting the fan at 10,8 V pulls down the cooling water temperature 3 ºC, then it's more or less as audible as a PSU fan.
A curious test was to make the computer water at full load without water pumping. Temperature started rising: CPU till 62 ºC, water till 52 ºC, then it stabilized 1 ºC less (CPU at 61 ºC and water at 51 ºC), I kept it this way 15 min. and temperature didn't change. When I reconnected the pump temperatures went down abruptly to 55 ºC in the CPU.
Results table:
|
Fan voltage (V)
|
CPU
|
CPU temperature (ºC)
|
Cooling water temperature(ºC)
|
Motherboard temperature(ºC)
|
Ambient temperature(ºC)
|
|
10.8
|
full load |
45
|
33
|
38
|
27
|
|
6,3
|
full load |
47
|
36
|
40
|
27
|
|
0
|
full load |
57
|
47
|
42
|
27,5
|
|
10.8
|
low load |
42
|
32
|
40
|
28,5
|
|
6,3
|
low load |
46
|
37
|
41
|
28,5
|
|
0
|
low load |
51
|
42
|
41
|
29,5
|
To make the CPU go at full load I programmed a looping query with Access on around 80.000 registers. Low load means ordinary use of the computer (text processing, Internet navigating...)
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