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Memory Subsystem
We are using SiSoft Sandra's Memory Benchmark since it allows the use of all prefetch mechanisms that are necessary in order to get n idea about the raw bandwidth the system is capable of. The discussion has come up repeatedly that buffering should be disabled, however, we feel that those results are interesting but by no means relevant for the desktop platform.
Note the increase of memory bandwidth achieved by moving from 2.5:3:3 (FX51 2.5) to 2:3:2 (FX51 2.0)latency settings. At the PC3200 memory frequency, the system would not boot if tRCD was set to 2 cycles, even with Winbond BH-5 based DIMMs. The increase in bandwidth when the system was overclocked to a 210 MHz external clock signal shows that the memory bus at least is directly dependent on the CPU input clock. (D) dual channel nForce2, (S) single channel nForce2
All further benchmarks will be run at 2:3:2 unless specifically indicated otherwise.
Cachemem 2.65MMx
Lower is better; P4: transparent blocks, A64FX-51, petrol-color blocks. We only show the two top contenders here, that is the ASUS P4P800 with PAT enabled (whatever they may call it) which is the fastest P4 board out there still against the ASUS SK8N with the low latency memory controllers built into the CPU. Even though the P4 numbers are already out of this world, it does not stand a chance against the A64FX. Note the impact of the 1MB cache on the 1MB block size transfer latencies.
For the record, as much as we appreciate the existence of SiSoft Sandra and deem it a valid benchmark wherever appropriate, we are not going to show CPU benchmarks since they have no bearing on real world performance.
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