Core 2 duo dell optiplex 780 July 8, 2019 16 32 64 128 Dell optiplex 780 core 2 duo price in pakistan Dell optiplex 780 core 2 duo especificaciones Dell optiplex 780 core 2 duo specs Dell optiplex 780 intel core 2 duo Dell optiplex 780 desktop core 2 duo Dell intel core 2 duo cpu