NO it will not fit in ddr slots...I think that rambus only came with the socket 423s but i could be wrong
You will be able to over clock on a different board as well
you will need to get some crimms (0MB memory sitcks) if you are going to get a board with more than your current memory slots
don't know of a good reseller for them since
www.compgeeks.com is sold out but i do know they are usually really cheap like under $30 check pricewatch and ebay though