Yes you can. TDP doesn't matter when it comes to compatability, except with respect to Power Supplies. A 4 Watt difference shouldn't make much of a difference except to maybe make your system run a little hotter than it used to. As long as the chip you are swapping in has the same socket(S1 in this case I believe) as the old chip, you should be fine. Keep in mind that when upgrading, that if you swap the processor, you may need to relicense your OS.