We ran a couple of tests and used a fine tuned VIA KT133 based  ABIT KT7-RAID mainboard with 800 MHz AMD Thunderbird processor.

We choose to benchmark the module in 133 MHz mode at CAS2and made a comparison towards Corsairs PC133 2-2-2 CAS2 memory module. As you can see in the table, CAS2 PC133 rocks at high speeds, compared to Corsair the difference is almost nihil. If we look at games for example the framerate could be boosted with about 2% maybe 4% at it's best at CAS2 compared to CAS3. If we would push the CPU's FSB higher than 133 MHz then this memory is flexible enough to pick up that FSB speed and get more performance out of the system while remaining stable.

Also notice that the memory at CAS2 is performing on a 800 Mhz system at a 1 GHz level.