I have a question. My computer in question is a HP XW4300 workstation. On HP's site they list pentium d as an upgrade for the Pentium 4 HT. All of the models of the computer are LGA 775 and because of that I am wondering if i can put a Core 2 duo in there to boost performance. The os i am using is windows xp Professional SP3 and my graphics card is an Nvidia Quadro NVS 280. Thank you fore your help