Testing:

Time to put this beast to work don´t you think? We used a Coolermaster IHC-L71 "Fujiyama" as comparison, also borrowed from ColorCase.be. Nice people there :)

As test system there where the following components:
MSI 845PE with raid
Intel P4 1.7Ghz (100mhz FSB)
256mb PC3200 Corsair
Maxtor 40 GB UATA 133
Voodoo 3 16mb PCI :D
320w Superflower PSU and 300w Aopen PSU for the pelts.


On boot, the system directly rise to 46°C. Then the fan switched to 8v and the temp dropped again. Then the fan went to 6v and the temp kept dropping. After 15min of doing nothing in the BIOS, the cpu temp dropped to 26°C.
That was what Activecool used was advertising. But they mentioned it as an idle temperature. That isn´t true because windows always uses a little bit of your CPU but it gets close enough. The Coolermaster heatsink wasn´t doing so great directly hitting 47°C at boot and strange enough, that wouldn´t drop :) Mind that this is an older CPU and creates more heat than newer northwood´s. Another remark: my room temp is 20°C exactly :)

When I used folding to stress the cpu, the temps raised quickly to about 43°C. Not bad! The strange thing is that the cooler was still running on 6v. If you do a simple calculation " Power = amps x voltage " you first get 3,84w = 0.32A x 12v. Now if the fan is running at 8v that makes 8v x 0.32A (remains constant) = 2,56w. That means that te fan can go about 1/3 faster. Still this process is only initialised when the CPU temp reaches 50°C, with other words useless at this moment. But with some overclocking, we should get a better look at this volt switching action of the AC4G. In the meantime, the Fujiyama´s temp under load was also rising, reaching 50°C and remaining constant there.



Now I´ve pumped the FSB to 115mhz, turning it into an 1,95ghz P4 and gave it 1,85v. I know it´s not the greatest overclock but I wanted to create as much heat as possible, and I succeeded. After 1min of folding the 50°C limit was reached and the fan started it´s 12v cyclus. In a matter of seconds the system changed from silent to irritating loud! Compare it with the sound of a Dragon Orb 3 with a storm cap. Damn irritating, but it sure was helping the temps.

The system was changing to it´s 12v and 6v cyclus back and forth all the time. That means the temp was about 49~51°C. My Fujiyama kept the CPU 55°C fully stressed and overclocked.
The temps were just so high because this overclocked P4 gives out 112 Watts to the heatsink, quite alot!