PC2400 ram IS good for overclocking!
thats 150mhz base bus speed versus 133 for standard PC2100 ram.
and judging by the 2-2 it should be capable of doing 150Mhz @ Cas2.
probably even higher.
i have PC150 SDRAM rated at 3,3,2. i can do full cas 2 all the way up to 160Mhz.
overclock, then run something like seti@home to stress test it.
"i love the smell of Overclocking in the morning!" Says my Hamster.