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LOSTCIRCUITS

SHORTCUTS:
Top page
intro to latency
CAS-3 vs CAS-2
133 MHz
154 MHz
166 MHz
harmonics and odd frequencies
bandwidth at 143 MHz
3D performance at 143 MHz
conclusion
 Latency vs. Bandwidth, a performance analysis   
Life Beyond 150 MHz
(Review by MS, August 15, 2000)


As 3D-application, Expendable is most likely to heavily depend on FPU performance including FPU memory bandwidth, rather than on integer performance including CPU memory bandwidth. The FPU memory bandwidth scores were not affected as badly by the 143 MHz setting as the CPU memory bandwidth and, therefore, one might expect less of a relative performance hit.

At 3:3:3 settings, Expendable "go.exe" would show some erratic behavior in that the frame rates were not consistent from one run to another, particularly at the higher bus speed settings, In addition, the system tended to crash frequently or simply exit the benchmark without finishing. I am, therefore, not including these frame rates.

Similarly, at 2:3:2 settings and 150 MHz using Corsair CAS-2 DIMMs, the system would hang occasionally, whereas, with the same DIMMs, the system would run flawlessly at 2:2:2 (150 MHz!!!) latencies.


Expendable frame rates at 100, 133, 143, 154 and 166 MHz, 2:3:2 latency settings

At 143 MHz, Expendable frame rates are slightly faster than at 133 MHz, consistent with the higher FPU memory bandwidth.

Expendable frame rates at 100, 133, 143, 154 MHz, 2:2:2 latency settings

Remember that at 2:2:2 timing settings, FPU memory bandwidth was identical for the 133 and the 143 MHz memory bus frequency? Expendable frame rates duplicate this result. Note that it was impossible to run at 166 MHz and 2:2:2 settings.

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