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The Pentium 4 Northwood reached a maximum of 4 GHz with a modicum of stability. Above this, signs of failure appeared in the form of Windows errors.
We used two conventional 3.2 GHz processors that can be bought at retail channels for this test. They thus reflect performance results that can be achieved with commercially available processors.
The following table shows the all configurations we benchmarked and tested:
|CPU Clock||FSB Clock||CPU Voltage|
|P4 Northwood||3,207 MHz||200.5 MHz||1.55 V|
|P4 Northwood||3,535 MHz||220.9 MHz||1.55 V|
|P4 Northwood||3,695 MHz||230.9 MHz||1.55 V|
|P4 Northwood||3,866 MHz||241.7 MHz||1.575 V|
|P4 Northwood||4,009 MHz||250.6 MHz||1.625 V|
|P4 Prescott||3,207 MHz||200.5 MHz||1.375 V|
|P4 Prescott||3,535 MHz||220.9 MHz||1.375 V|
|P4 Prescott||3,695 MHz||230.9 MHz||1.375 V|
|P4 Prescott||3,866 MHz||241.7 MHz||1.40 V|
|P4 Prescott||4,009 MHz||250.6 MHz||1.425 V|
|P4 Prescott||4,149 MHz||259.4 MHz||1.50 V|
In order for the processors to remain stable at 3.8 GHz and higher clock speeds, a compressor cooling system was required. The processor cores' voltages, which increased drastically at 4 GHz, produced a clear rise in thermal power - without the VapoChill the processor could not have handled the thermal power of well over 100 watts.
The P4 Prescott gained an edge over the Northwood with a somewhat higher maximum speed: 4.175 MHz, which indicates its potential.