RDRAM: Anyone have any??

Any of y'all familiar w/ "RDRAM"? Seems it's a rather rare type of RAM for older (by today's stds.) computers (e.g., Dell Dimension 8200). I just recently acquired another hand-me-down computer from my Dad (yeah: a Dell Dimension 8200), and the RAM architecture is the weirdest I've seen: not only to the boards have to be in identical pairs, BUT any empty slots must be occupied by "continuity boards" as well! I guess this config. didn't last long because they were barely smart enough to build only a few. Anyway, if anyone has any spare RDRAM boards lying around, please give me a shout. I need a couple of 512Mb.-size (or higher). Muchas gracias in advance! :-)