Replace two Active Directory Servers keeping the same IP?

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http://serverfault.com – I have two AD servers: and One is a Windows Server 2008 (non-R2) and the other is R2. Both are AD servers for our local network. It's a simple network, 30 clients. Now I need to replace the hardware of these two servers for newer, most powerful ones. But the server NAMES and IP ADDRESSES must be the same after the replacement. What should be the best path to follow and to keep the AD database? (I cannot change the IP address when the machine is an AD server) Update I'm thinking in: Demote Remove it from domain. Add the new server into domain with t (HowTos)