Migrate CA from 2003 (i86) box to 2008R2 (x64)

I have seen documents that say migrating from 32 to 64 bit IS possibile
and then i've seen several people say it is not.  Since 2008R2 is
64bit only, how can an orgainization handle upgrading their CA?

I have my CA on a 2003 SP2 box that I need to move to a 2008R2
(understand that the CA name cannot change).  Is there anyway to do
this ?  Thank you in advance !

See if this helps.

See if this helps. Although it talks about w2k8 I believe it is almost the
same process for w2k8R2.

http://technet.microsoft.com/en-us/library/cc742388(WS.10).aspx