Hi, for the SIS 648 chipset, ASUS P4S800, it has 3 DIMM slots and says it supports up to 3 GB RAM, but I'm not sure what this means, can anyone explain it to me ? "PC2100/1600 support up to 3 DIMMs; PC3200/2700 support up to 2 DIMMs; 1 GB PC3200/2700 with 32 DDR chips support to 1 DIMM only."