Dell Optiplex, Intel Pentium D Dual Core 3.0 - New 4GB Ram - 500GIG HDD , New Wifi,Windows XP Professional - (Certified Refurbished) This certified reconditioned product is tested and certified by the manufacturer or by a third-party seller to look and work like new, with some signs of wear. The reconditioning process includes functionality testing, inspection and repackaging! Processor - Intel Pentium D Dual Core 3000 MHz // New Memory Installed - 4096mb. Hard Drive - 500Gig SATA 7200 RPM // Optical Drive - DVD ROM +New WIFI INCLUDEDUSB.