Actually, the advantage of PC133 over PC100 with KT133 is very minimal, almost none.
Synthetic benchmark like SySoft might report higher memory bandwidth around 50-75MB/sec than PC100, but in reality, this difference doesn't make a noticable increase in performance at all.
In games like Quake3, the difference is even almost NIL..if not to say PC133 is only about 0.5-1 fps faster.
Mine using PC66@109 CAS2 , and compared to PC133 CAS2.....0.5-0.8 fps different (92.4 vs 93.1). This test is using Duron 700@1036 with Asus 7100 Geforce MX at 220/210.
Why spend another 150$ for just such a miniscule performance improvement ???