My brother has a Dell 2400 with a 2.8ghz CPU. He wants to upgrade everything, except a new CPU. Does this CPU work if I take it out and put it into a new motherboard? Does anyone know what socket the CPU is in a Dell 2400 motherboard? I dont want to take off his heatsink and look at it, as I wont be able to tell what kind of socket it is. He ordered his case tonight, so I need to know what kind of socket it is before he buys a new motherboard. Im hoping a 478 socket, as that is the most commonly used in motherboards now. Please help, and thanks for your consideration and well...help.