ZT Reliant B402Xa Desktop PC (AMD Phenom X4 Quad-Core 9650 Processor, 4 GB RAM, 500 GB Hard Drive, XP Pro) Black (Discontinued by Manufacturer) AMD Phenom X4 Quad-Core 9650 Windows XP Professional Edition 5 Year Limited Warranty Integrated Radeon HD 3100 Graphics Lifetime, 24x7 Toll-Free Phone Phone Support