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LOSTCIRCUITS
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| Intel's P4 820D and 670 More Power to Duallies | |
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(Review by MS September 3, 2005) |
| P4-670 |
Caligari TrueSpace 5
Caligari TrueSpace is somewhat obsolete but we still like it as a benchmark in that it scales extremely well with the number of processors and gives good power figures that are indicative of a real world scenario under load.
Runtime
Multi-cores rule and, especially for the price, the 820 looks extremely attractive
Also from a power standpoint, the 820 beats the 670.
Performance per Watt
Intel's developer forum Fall 2005 was all under the sign of performance per power. We have introduced similar metrics in earlier reviews and continue to use them and expand upon them, not because we can but because this is the type of benchmark data that actually makes sense since it is this type of data that in the final analysis is reflected in the electric bill.
Total CPU power consumption per rendering pass [W*sec].
Two things are quite obvious, the first being that the current generation of AMD CPU is more power efficient than the equivalent Intel CPUs are. The second observation is that while performance scales with clock speed (at least to a certain degree), the power / clock speed relation is non-linear in that overclocking or increasing clock speed by spec causes a dysproportional increase in power consumption. Examples are the overclocked Venice Core as well as the comparison between the 820 and the 840 models. Interestingly, HyperThreading appears to increase the power-efficiency of the P4 840 - there is a noticeable difference between the EE and the "D" version. The 670 comes in dead last here.
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Pentium4 820 D (dual core) |
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