An I right in thinking this is a full 64bit system? http://h10010.www1.hp.com/wwpc/ie/en/sm/WF06b/12454-12454-64287-3328898-3328898-3784892-3824954.html I google the chipset http://www.intel.com/products/desktop/chipsets/q45/q45-overview.htm It says the Memory is 64bit support. Frank