Intel 915GEV works fine for testing and VMotion
For my test lab the only 2 motherboards I had that were exactly the same were 2 Intel 915GEV units, each with a P4 2.8GHz chip and 4GB RAM. I know this is an older board and it also has a flaw with the way it addresses memory. It will only see 3GB in the BIOS and says something about system resources use the rest. I guess its because its not full 64bit. Anyhow I put an Adaptec 29160 SCSI card on each one with an 18GB SCSI drive.
The onboard Yukon NIC is not recognized unfortunately, but I just put in a dual Intel 100/1000 and it works fine. My testing used version 3.5 U1-4 hooked up via iSCSI to a sanMelody SAN unit (old DL380 G1 running 2003 Server no less) and ran everything through a GB switch. The SAN is slow (only 133MHZ FSB) but works well enough for testing. I was able to cluster and then run VMotion with no issues.
My next test setup will be all Xeon and Core 2, but for now with the hardware I had laying around this worked great.