Dell OptiPlex /Core i5-2400 Quad @ 3.1 GHz/NEW 16GB Memory/2TB HDD/DVD-ROM/WINDOWS 7 PRO 64 BIT- (Certified Reconditioned) Core i5-2400 Quad @ 3.1 GHz/NEW 16GB Memory/2TB HDD. Windows 7 Professional 64bit. New Power Cord. 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.