NEC WA2500 WS i-Select, 2 GHz, 1 GB, DDR-SDRAM, DVD-ROM, Windows XP Professional NEC WA2500 WS i-Select. Processor frequency: 2 GHz. Internal memory: 1 GB, Internal memory type: DDR-SDRAM. Optical drive type: DVD-ROM. Operating system installed: Windows XP Professional. Power supply: 550 W. Chassis type: Mini Tower. Product type: Workstation