Increase your performance by up to 80% with the AMD Athlon 64 X2 dual core processor. Work or play with multiple programs without any stalling or waiting. Dual-core technology is like having two processors, and two working together is better and faster than one working alone. Do more in less time with the AMD Athlon 64 X2 dual-core processor. This Athlon X2 4400+ processor is rated at 2.2GHz, with two 1MB L2 caches and a 2MHz system bus.