Why on earth would Intel sell a chipset/mainboard that uses a type of RAM that is expensive to buy? To pay $1,200 for PC800 128MB modules is nuts - the ordinary user cannot be expected to pay that amount.
Which probably explains their CC820 mainboard, basically the i820 chipset but with the MTH which degrades system performance so PC100/PC133 RAM can be used.
I don't ever remember SDRAM being as high when it initially came out as RDRAM is just now. This RDRAM is off to a very bad start, technically it is doubted and price wise - it's tripped up before it's even got off the starting line.