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Latency vs. Bandwidth, a performance analysis
Life Beyond 150 MHz
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(Review by MS, August 15, 2000)
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Odd frequency and high latency
SiSoft Sandra Memory benchmark scores at 100, 133, 143, 154 and 166 MHz, 3:3:3 latency settings
At 143 MHz, at least the CPU memory bandwidth does not increase as expected, the FPU memory bandwidth shows a small increase over the 133 MHz bus but still lags compared to the expected values.
Low latency increase the oddity
SiSoft Sandra Memory benchmark scores at 100, 133, 143, 154 and 166 MHz, 2:3:2 latency settings
With shorter latencies, the mismatch between 143 MHz and the "even" frequencies becomes more pronounced.
SiSoft Sandra Memory benchmark scores at 100, 133, 143, and 154 MHz, 2:2:2 latency settings
At 2:2:2 latencies, the 143 MHz bus is efectively slower than the 133 MHz bus. It was not possible to run at 166 MHz 2:2:2 settings
next page: => the odd frame rates =>
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