One thing to remember about RDRAM/DDR bandwidth effectiveness is that there are a total of two RDRAM desktop chipsets out (one for P3 one for P4), and...11? DDR desktop chipsets total (SiS - 735 and 645; Via - P3 chipset, KT266, KT266a, KT333, P4X266, P4X266a; Ali - Magik 1, P3 chipset; AMD - 761).
I think the next RDRAM chipset will show better use of the available bandwidth.
Interesting that the P4 didn't do better in Serious Sam 2, since it has some SSE2 optimizations..
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