No...I think it is the pc133...it neuters the p4 system...MOst pc133 is insufficient for tbird and XP's, hence all the ddr platforms kt266, kt266a, kt333, ali magik, sis6635, sis735, etc...
One thing to also remember is this is only a 1.6ghz p4...The 1.4tbird in reviews held it own against the 1.8p4 willamette. Eventhough this is a 1.6 northwood it is not enough gain over p41.6 willamette to make it better then the 1.8ghz p4..,.therefore I expect a tbird to do better. Then ask those guys if they were running ddr and I bet the answer is yes....even conservative ddr made a 10-15 percent difference in performance....
also with the winxp issue: The drivers you are using are optimised for winxp. Then throw in that winxp does a much better job of memory and program management. It is likely with that quite full computer you have that winme is just not managing the system memory and program applications, and therefor they are stealing the bandwidth you have little of anyway...
I feel these score are right for this system at default...
Do your games work??? That is all that matters...
Get a board with ability to use rdram or ddr and then you will see how a better memory subsytem will help the p4 deliver...