Lenovo ThinkCentre M93p Premium Business/Enterprise Level Tower Desktop - Intel Core i5-4570 Processor (4 cores / 4 threads, 3.2GHz, 6MB cache), 4GB, 500GB with 7200rpm, Intel HD Graphics 4600 (Windows 8 Professional) Intel Core i5-4570T Processor (2 cores, 4 Threads, 2.9 GHz, 4MB Cache) PC3-12800 1600MHz DDR3 Intel HD Graphics 4600, One VGA, Two DisplayPorts, 11 b/g/n wireless, Intel Centrino Wireless-N 105 Front ports: Two USB 3.0, One microphone, One Headphone/Microphone combo jack/ Rear ports: Three USB 3.0, Ethernet Windows 7 Pro 64-Bit preinstalled through downgrade rights in Windows 8 Pro 64-bit 3 Year Onsite NBD Lenovo Warranty