Intel Presler 955: Benchmarking the First 65nm CPU - Presler Heat Dissipation
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Presler Heat Dissipation
No review of a Netburst-based CPU would be complete without a test of heat dissipation. To find its level of heat dissipation, or wattage at any clock, we first need to find the effectiveness of our cooler.
We know at stock speeds the CPU is around 130W (based on Intel's datasheet). Our ambient temperature is 26C. So with a full load temperature of 41C, we get a delta in temp of 15C. Given this is a 130W CPU, we find our cooling has a 0.115C/w ratio. With this data, we can calculate its heat dissipation at higher temperatures.
Presler Clock Speed | Vcore | Delta in temperature
against ambient
(degrees C) | Heat dissipation (Watts) |
3.46GHz | 1.3V | 15C | 130W |
4.26GHz | 1.3V | 21C | 183W |
4.5GHz | 1.55V | 38C | 330W |
As seen here, the CPU is has a fairly reasonable heat dissipation level for a dual core CPU. That is until you start to pump more vcore into it, whereby heat dissipation levels jump through the roof. The CPU was still extremely fast at 4.26GHz (especially if you run at a higher FSB) so by no means should these results disappoint.
It should be interesting to see how this compares to Intel’s 90nm based dual core Extreme Edition. The Pentium D 840 (Smithfield core).
Smithfield Clock Speed | Vcore | Heat dissipation (Watts) |
3.2GHz | 1.35V | 130W |
4.0GHz | 1.4V | 270W |
Although the initial power saving benefits on Intel datasheets were less than satisfactory, the benefits from the move from 90nm to 65nm can be seen here. As you start to pump the clockrates and vcore higher, the 65nm Presler moves quickly ahead in its performance:watt ratio. The old Smithfield dissipates almost double the heat of its 65nm counterpart at 4GHz.
Next: Conclusion >>
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