I am no fan of RDRAM.  I purchased a Pentium 4 computer from a major OEM several years ago (pre-Windows 2000).  At the time 256 Mb was "more memory than any one would ever need" so that's what I bought.  It was RDRAM so it was supposed to be faster than regular memory and the 1.4 Ghz processor really took advantage of it.  Uh-huh.  A year or two later Amazon had RDRAM listed so I put it on my wish list because I'm pretty hard to shop for.  My Mom purchased it for me for Christmas and I installed it about a month later--one DIMM.   Lo and behold RDRAM has to be installed in pairs so I went back to Amazon and ordered another one.   I'm still waiting for my order to be filled.   Lessen learned--never order RDRAM.