Intel Core 2 Duo E6550 Dual-Core processor CPU speed: 2.33 GHz Bus speed: 1333 MHz Bus/Core ratio: 7 L2 cache size: 4 MB Socket 775 Thermal design power: 65W VID voltage range: 0.85V - 1.5V Enhanced Intel Speedstep Technology Intel EM64T 

Intel Pentium 4 2.8 GHz 800 MHz 1 MB Socket 775 CPU General Features: Intel Pentium 4 processor 520 (Prescott core) 2.8 GHz clock speed 800 MHz system bus 1 MB L2 Cache 775-pin PLGA