Dell OptiPlex 780 USFF Desktop Intel Core 2 Duo 3.0 GHz 4 GB RAM 250 GB HD DVD Win Pro 32-Bit Intel Core 2 Duo E8400 3.0 GHz dual-core processor 4 GB DDR3 SDRAM (supports up to 16 GB) 250 GB Serial ATA hard drive Windows Professional 32Bit. Microsoft is discontinuing offering Windows 7; this product will be installed with either Windows 7 or Windows 10. DVD-ROM drive, Dell USB Keyboard, Dell USB Mouse