First up is the memory test from SiSoft's Sandra, which is a modified version of the Stream benchmark. Here's how things stack up:
Now let's look at it another way with Linpack.
Next, compare the numbers at about 192K, where the data to be processed fits entirely in the processors' L2 caches (with the exception of the Celeron and Duron). The Pentium 4's L2 cache is fastest here, though the Athlon XP 1900+ isn't too far behind.
Finally, compare the numbers out at 1800K, where the processors must all access main memory constantly in order to retrieve data. Here, the processors compare about like they do in the Sandra memory test; the P4 is fastest, followed by the Athlon XP/KT266A combo, then by the other DDR systems. The Pentium III and the value processors use slower, plain ol' SDRAM, so they're quite a bit slower.
Until the Athlon XP's front side bus gets faster than 266MHz, I wouldn't expect to see it challenging the Pentium 4 in raw memory bandwidth. The Pentium 4 simply excels here, and its ample memory bandwidth is a big contributor to the P4's solid gaming and multimedia performance. However, these numbers don't mean nearly as much as the scores in the performance benchmarks that follow...
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