Apple Mac Pro (Model 1,1) Quad-Core 2.66GHz, 16GB RAM, 1TB HD, Snow Leopard 10.6.8 2x Intel Xeon Dual-Core 2.66GHz Processors (4-Cores) 16GB (8x 2GB) DDR2 667Mhz ECC Memory - 500GB Hard Drive Geforce 7300GT 256MB Graphics Card w/ 2x DVI Output (2 Display Support) Snow Leopard 10.6.8 OS - Lion 10.7.4 Only, Superdrive Pre-owned. 14-Day Return and 30-Day Warranty Period. 2000+ Mac Pro's Sold. Visit us at iBuildMacs.com or call (310) 844-6661.