A Bulletin Board from the backside of the internet

This era of Xeons can be confusing, I looked it up myself to clarify but as suspected your CPU definitely has 64-bit instructions if your box runs DDR2 memory. Nocona and Irwindale were the earliest Xeons designed for DDR2, and what you've got is either basically a P4 Prescott HT (but the Xeon versi...