Articles: Cooling
 

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Performance

In fact, we are not that much interested in the temperature numbers as in traditional coolers tests, although we will provide them too. The maximum stable clock rate of the processor is the main goal of our test session.

Intel Pentium 4 3.20C GHz

Rated frequency: 3200MHz
Clock rate achieved with air cooling: 3550MHz
Clock rate achieved with water cooling: 3660MHz
Water-chiller: 3780MHz
VapoChill XE: 4065MHz

The testing methods are the following: in every case we made sure the processor worked stable at the maximum possible frequency. The frequency at which you can boot up the OS to make a screenshot is in average about 100MHz higher than that.

Until the water-chiller, we left the Vcore intact (1.55V), as overclocking was only worse with a higher voltage.

Air cooling was provided by an Akasa 670-CuBL cooler with a copper sole. The average CPU temperature under a workload was about 60°C.

Water cooling was represented by a highly efficient home-made system. The CPU temperature under a workload and at the above-indicated frequency was about 32-35°C.

The temperature of the liquid inside water-chiller was +7°C, the CPU temperature being +16°C, and the Vcore = 1.75V.

When using the VapoChill, we set the Vcore to 1.75V. Further increase of the core voltage resulted in worse overclocking. The CPU temperature at 4065MHz was about -5°C. The maximum frequency at which I managed to make a WCPUiD screenshot was 4181MHz.

Intel Pentium 4 Extreme Edition 3.20GHz

Rated frequency: 3200MHz
Air cooling: 3650MHz
Water cooling: 3760MHz
VapoChill XE: 4150MHz
Testing methodology is the same.

Air cooling: full-copper coolers CoolerMaster Fujiyama and CoolerMaster Aero 4. The Vcore was standard.

Water cooling: a highly efficient home-made system. The temperature under a workload was in between +32 and +35°C at the above-mentioned frequency. The Vcore = 1.75V.

VapoChill XE allowed us to reach a stable frequency of 4150MHz with the Vcore = 1.8V. The processor was working at 4200MHz in our tests, but this mode was not absolutely stable. It passed the Hexus PiFast test at 4234MHz. The maximum frequency for making a screenshot was 4260MHz.

Intel Pentium 4 3.40? GHz

Rated frequency: 3400MHz
Air cooling: 3750MHz
Water cooling: 3810MHz
VapoChill XE: 4215MHz
The testing conditions are the same.

Air cooling: a copper cooler CoolerMaster Fujiyama. The Vcore = 1.70V.

Water cooling: a highly efficient home-made system. The temperature under a workload was in between +32 and +35°C at the above-mentioned frequency. The Vcore = 1.75V.

We stopped at 4215MHz with the VapoChill – that’s an impressive result.

Not bad, yeah? We’ll have to wait long to see off-the-shelf products reaching similar frequencies. Moreover, only phase-change systems allow modern processors to get beyond 4GHz. This makes them indispensable where extreme performance is required: in professional applications, in hi-end gaming stations and in systems of computer enthusiasts.

 
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