I've a customer setting up a machine running the following services:
windows server x64 (2003 r2 or 2008 r2)
8 GB DDR2
apache
mysql
openfire xmpp server ~ 500 concurrent users
-- using webrtc / red5 flash server capability for video streaming too
He want's detailed information which CPU would be the better choice to go for an (mainly) xmpp server:
1x Intel Pentium D (dual-core) processor 3.2GHz /4M/800 SL94Q Sockel 775
or
1x Intel Pentium 4 (single core) processor 3.6GHz (with hyper threading) /2M/800 SL7Z5,SL8PZ
Since i do not know if openfire is optimiesed for dual or even quad core usage i rather ask you experts ;-)