Upgrade Server 2008 x86 to Server 2008 R2 (x64)

Is it possible to do a direct upgrade from 2008 x86 to Server 2008 R2 x64?  I'm dealing with our primary domain controller so I'm not at all excited by having to rebuild it if this can't be done.
JimmyCanzAsked:
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KCTSConnect With a Mentor Commented:
You can't do an 'in-place' upgrade.

You CAN
-install 2008R2 on another server
-add the 2008R2 server to the domain
-promote the 2008R2 machine to be an additional Domain Controller
-replicate AD and DNS to the 2008R2 machine
-add DHCP to the new 2008R2
-move the FSMO roles to the new machine
-optionally demote/remove the old 2008 32bit server.
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joelsplaceConnect With a Mentor Commented:
No MS operating system will upgrade from 32 bit to 64 bit.  You'll have to stay 32 bit or start from scratch.
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joelsplaceCommented:
That's the way to do it.  I read the first sentence and jumped straight to an answer.
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