SiS makes the 648, Intel makes the i845. 648 can support PC3200 (depending on the board manufacturer), i845 supports PC2100 or PC2700 depending on version, i845E, EP, G support PC2100, PE, GE support PC2700.
Those are the max memory speeds supported. Any of these boards also support slower DDR memory types.
There are a lot of junk boards with the 648, the worst of which is the Asus P4S8X. The best 648 board is probably the Gigabyte GA-8SG667.
SiS 655 chipset boards will be availble soon, which use Dual Channel technology, doubling memory bandwidth by using a matched pair of DDR modules.
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