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Both of these tests show about the same 3% increase in performance when jumping from the 1900+ to the 2000+. While those numbers may not seem like a lot, they pan to be about a 20% gain when comparing the 1.4 GHz Athlon XP 1600+ with the 1.67 GHz Athlon XP 2000+.
These tests were done with the “controversial” patch provided to me by AMD. As I have mentioned before, the patch in no way modifies the benchmark in anyway, it only lets the Windows Media Encoder that is installed by the Sysmark 2001 program to recognize the SSE instructions in the Athlon XP processors. If you have Windows XP and do a OS update via the online updater, you will get the version of the Encoder that enables Athlon XP SSE.