I think what he's tring to say is excatly what he typed
I am looking for a motherboard/chipset that will support 512MB(2 dimms) of PC2100 Registerd ECC DDR
This sure looks pretty clear to me, that he want to know which motherboard would support 2 dimms , 512mb total of pc2100 REGISTERED ECC DDR ram, what else can he be asking besides this..
He probably already have those 2 stick and would like to know what motherbaord would support them so if/when he get a new motherboard it'll work with those ram, instead of needing to get new ones.
The Asus K7m266 (the one that uses AMD761 chipset) seem to support registered ecc ddr ram. But this board is dying out so I don't recommend getting it.