Ok, using Sisoft Sandra 2001
Generic PC133 CAS 3 RAM @ 100 Mhz FSB
CPU/Memory Bandwidth 309 MB\s
FPU/Memory Bandwidth 331 MB\s
Same RAM @ 133 Mhz FSB
CPU/Memory Bandwidth 347 MB\s
FPU/Memory Bandwidth 386 MB\s
So, simply going from 100 to 133 FSB gives me 12-16% increase in memory bandwidth. Maybe I will throw my Mushkin 128 MB CAS 2 stick in there and see the differences.
Hope that helps.