HP Compaq Elite 8300 Ultra-slim Business Desktop PC - C9H23UT Windows 7 Professional 64 (available through downgrade rights from Windows 8 Pro 64) Intel Core i5-3470 with Intel HD Graphics 2500 (3.20 GHz, 6 MB cache, 4 cores) 4GB 1600 MHz DDR3 SDRAM 320GB 7200RPM SATA 3.0 Gb/s NCQ, Smart IV SuperMulti DVD+/-RW