AFAIK there are 2 main flavours of 64 bit x64 and itanium View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4232828#4232828 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4232828