HP Workstation Z400(FL967UT#ABA) Xeon W3520 (2.66GHz) 3GB DDR3 500GB HDD Windows XP Professional 32-bit (available through downgrade rights from Genuine Windows 7 Professional 32-bit) - Newegg.com
HP Z400 Workstation CMT Desktop | Xeon-W3520 2.67GHz | 8GB | 500GB | W – Dynamic Computer Surplus