Think about it, regular RAMBUS is 16-bit, RIMM4200 is a 32-bit version of the 16-bit PC1066. It has more connections, which means a different socket.
And even if it wasn't a difference socket (which it <i>is</i> different) you would still be accessing the RAM as though it were 16-bit on a 16-bit RDRAM mobo. So you'd probably end up with only half of the stick's memory being used anyway. So it's probably a good thing that they're different sockets or else people would be complaining a lot about their system not reading their RAM right.
<pre><A HREF="http://www.nuklearpower.com/comic/186.htm" target="_new"><font color=red>It's all relative...</font color=red></A></pre><p>