> There is only one thing to watch out for both Xeon and Opteron. If your > current Xeon is 32-bit, and the new processor (even if it is Xeon) is > 64-bit, *and* you install 64-bit version of Linux *and* 64-bit MySQL > binaries, you can't just copy binary database files to the new machine. > It probably won't work. Well, maybe it would, but I would very strongly > recommend against it. Use mysqldump to dump database into file, and > re-imort it on new machine. Or setup replication between two machines. > This is recommended even when moving database between two identical > machines anyhow. ??? I have copied a binary mysql database from an Intel 32-bit box (Pentium 4 2.8Ghz Centos 4.4) to an AMD 64-bit box (AMD Athlon 64 3000+ Centos 4.4 64-bit) without any problems. It was a straight copy of /var/lib/mysql to the other box and then start the mysql server. I did not even copy the my.cnf file since I had not make any changes to the one provided by the rpm. I believe you mean postgresql databases. I had to do psqldump to transfer the postgresql database to the AMD64 box. I think you can even move mysql databases from Windows to Linux without problems. Aren't mysql databases machine independent?