(Renewed) Lenovo ThinkCenter M57(Core_2_Duo_E7500 2.93GHZ ,4GB RAM,160 HDD 7200 RPM, Intel Q35 Express, Slimline, Intel HD Graphics, Win 7 Prof, DVD, USB, Ethernet, Audio in/Out), Black vs ROLLTOP CPU159 Desktop CPU (Intel Core 2 DUO 2.9 GHZ/4GB RAM/500GB HDD/G31 Motherboard) Black