HP Mini-Tower Workstation F1M47UT#ABA has a capacity of 1 TB and comes with the Windows 7 Professional. The system is upgradable to the updated Windows 8.1 Pro and has a Quadcore Processor..Processor Type + Speed + CPU Cache + Cache Processor: Quad-Core/3.70GHz/10MB.Hard Drive Capacity + Hard Drive Speed + Hard Drive Type + Hard Drive: 1TB/7200RPM/Serial ATA.Memory RAM + Memory Speed + Memory Type + Installed Memory + Expandable to: 8GB/2133 MHz/DDR4/128GB.Mouse Type: USB Mouse.Keyboard Type: USB Keyboard.Dimension: 17"H x 6.7"W x 17.5"D.Operating System: Windows 7 Professional Upgradable to Windows 8.1 Pro.Optical Drive: DVD-Writer.USB Standard: Not Found - Relevant value not available.Chipset: C612.Power Supply: 700 W.Audio Ports: Yes.Ethernet: Gigabit.Form Factor: Mini Tower.Bluetooth: No.Weight: 24.3 lbs..Wireless Card: No.Bluetooth Standard: No.Warranty: 3 Years.HP Mini-Tower Workstation F1M47UT#ABA - Comes with Windows 7 Professional and is upgradable to Windows 8.1 Pro