Now, let us turn to the promised real applications. Be ready for some surprises here.
Business Winstone 2002 seems to confirm the general rule. Processors with higher clock-rate provide higher performance. In case of the same CPU working frequencies, the platforms get ranked according to their memory speed. The only curious, but anyway quite predictable, result is that Pentium 4 2.4C overclocked to 3GHz and using DDR400 memory at 5:4 of the FSB frequency runs faster than the “true” Pentium 4 3.0 with DDR400 SDRAM in the synchronous mode. This is probably because the FSB frequency not only affects the overall system performance but also influences the processor bus bandwidth a lot.
Multimedia Content Creation Winstone 2003 has it somewhat another way. For example, Pentium 4 overclocked to 3.3GHz and working at 275MHz FSB, but with DDR336 memory, falls behind the “true” Pentium 3.2GHz with fast DDR400. It means that Content Creation Winstone 2003 needs the memory subsystem to work faster. This observation receives yet another proof from the fact that Pentium 4 overclocked to 3.0GHz, but using the diminishing coefficient for the memory frequency performs worse than the regular Pentium 4 3.0, notwithstanding the higher speed of the front-side bus.
WinRAR seems to be most sensitive to the memory subsystem performance among all the benchmarks we use. Sometimes it produces simply wondrous results, as we see here. For example, Pentium 4 3.0GHz and Pentium 4 3.2GHz working with DDR400 SDRAM with 2-2-2-5 timings outperformed all of their overclocked competitors, notwithstanding a considerable clock-rate gap. The reason is simple: when overclocking, we had to either worsen the timings or use the system and memory busses asynchronously. As you see, WinRAR is fastidious about that.