Refer back to my specs, i want to upgrade my pc by adding another stick of 256MB PC133 SDRAM into my system. But i noticed that the price for SDRAM is far more expensive than DDRSDRAM. Therfore for, i want to get some advises from your guys that whether i should get a stick of PC133 SDRAM or change my DDRSDRAM mobo n using back my S478 P41.8Ghz cpu?