Dell OptiPlex 755 Core 2 Duo E6550 2.33GHz 2GB 80GB DVD Vista Ultimate Ultra Small Form Factor Dell OptiPlex 755 Core 2 Duo E6550 2.33 GHz Small Form Factor General Features: Small form factor system Black and Gray Small Form Factor design Microsoft Windows Vista Ultimate pre-installed w/CoA Intel Core 2 Duo E6550 2.33 GHz Dual Core processor 4 MB L2 cache, 1333 MHz bus speed Intel Q35 Express chipset