HP Z440 525W 85%Efficient Chassis Win 10 Pro 64 Downgrade Win 7 64 US Intel Xeon E5-1607v4 3.1 10M 2133 4C CPU 8GB DDR4-2400 (1x8GB) RegRAM NVIDIA Quadro K620 2GB 1st GFX 1TB 7200 RPM SATA 1st HDD HP USB Keyboard US HP USB Optical Mouse 9.5mm Slim SuperMu