Hum,
your mobo will take 266,333,400 mem.
But,
avoid using 3 differing sticks with that chipset as there is a good chance that you will get memory issues…
(and when they do work), the slow memory will bottleneck your whole system like, er, xp.... :-)
Those tiny delicate SATA cables are so cool looking....
But try to resist ; wait until sata HD speeds increase, next year, past IDE.