DESC: Cutting-edge performance features on ThinkCentre M Series models include the latest powerful Intel Pentium 4 Processors with Hyper-Threading Technology, to help you accomplish more tasks at once with improved processor performance and system responsiveness (select models). New ThinkCentre M51 models include the Intel 915G Express chipset, providing the latest technology and faster performance; integrated Intel Graphics Media Accelerator 900 with an upgradeable 16X PCI Express slot; DDR2 memory; a range of optional optical devices, and a choice of optional, award-winning IBM ThinkVision monitors - all wrapped up in a newly designed chassis.