I read all the Internet debates about how it might or it might not and I can confirm that I tried it and it didn’t work. The server runs the host OS, SuSE Linux 64-bit, beautifully but it totally craps out when a 64-bit guest OS install is attempted. EM64T doesn’t do VT so.. if that’s what you’re looking for, start with the HP DL380 G5.
This server still has its benefits however. Including 6 drive slots (2×72,2×147,2×36 SCSI YAY), capacity for up to 12 GB of RAM (I installed 10) and it’s decently affordable. Another thing that I love about it is that I can change the POST text. How fun is that? So I made it say something that makes me laugh everytime. See if you can spot it:
Mmm 10240 MB Initialized… *drool*