to me it seems as if the answer is yes. I installed 8 GB RAM and the Bios POST correctly reports 8 GB. But although the /PAE-switch is set in the boot.ini, our 2003 server x86 (standard, sp2) only sees 4 GB after rebooting.
I saw newer mainboards that have this feature, the board of the server hasn't got it. Is this the problem?