BAPCo's SYSMark 2000 test is definitely appreciated by Intel because it not only shows off the advantages of RDRAM but it also takes advantage of the Pentium III's SSE instructions in a very favorably manner. While the benchmark is also 3DNow! optimized there is a noticeable difference in the standings coming from the CC Winstone 2000 benchmark to SYSMark 2000.
In any case, the Athlon still holds its own, while it isn't the highest performing solution here it provides a much greater value than the top performing Pentium III 800 using RDRAM. It is worth noting that the performance difference between running the Athlon 850 on a SuperBypass enabled AMD 750 based motherboard and a KX133 board is negligible, as is the performance difference between the AMD 750 with SuperBypass enabled and disabled (approximately 3%).