The standard RAM allotment for the M58p is 1GB of PC3-8500 SDRAM, and the standard hard drive included is a 160GB 7200RPM SATAII HDD. The motherboard features an integrated Intel GMA4500 graphics adapter. A DVD+/-R/RW drive is included as the standard optical media drive. The M58p includes Windows Vista Business as it's default operating system. The M58p is certified EnergyStar 4.0-compliant, for more environmentally sensitive computing.The ThinkCentre M58p is a series of tower-form desktop units from Lenovo. The M58p differs from the standard M58 in it's use of the Intel Core 2 Duo E8400 processor set, which are rated at 3.0 GHz.Enough airflow to handle heat generation even under heavy usage. Right side of the case is blank, can be set against a wall without blocking airflow. Processor capable of handling large computational jobs.Very basic, utilitarian grey and black case design. Not enough video processing power for hardcore gamers.