Ram

Hi Folks,

Have been playing about with PC's for 25 years just as a hobby, and am
completely addicted. I want to buy the Athlon 64 FX53, am ready to order.
One thing is stopping me and I hope you can help. I haven't a clue what
registered ram is? It say's in most reviews of the Evesham PC the firm of
choice, that the registered ram is slow, so, please can you tell me, does
this defeat the object of playing games for example. I would have my Choice
of a very fast CPU fast hard drive etc, but the ram would bring speed down
to say a XP 2000, do you think Rambus ram could be used with this
motherboard, just what the eck is registered ram and why is it slow?
Thanks!!
Paul.