There is not an Intel P4 300. I would assume a 3Ghz also. There is a P4 520 through 570 which range from 2.8Ghz to 3.8Ghz. For the price you can do better building yourself. Most big name companies cut corners in many places to cut costs like hard drive speed, chipset, video, sound card. Just because it is a P4 3Ghz doesn't always mean it is a high end system. Plus it will be almost impossible to upgrade later.