Since you're talking about my mod, I'll comment on it a little. Yes if you do it right it should work with the e4400 as well, since they have the same pin designations. The only difference is that the e4400 has a higher multiplier(10x), so if you do the mod, it'd go to 2.66ghz. I will say that not all motherboards work with the mod, some boards actually read the chip information to identify the chip's proper settings instead of using the "fsb pins" to set the fsb. Also of note, if you get a board that has bios overclocking options, then that is a better option than "pin modding" the cpu. Pin modding is only a good option when the board either has no overclocking options, or has very limited overclocking options. If you have more questions about the mod, feel free to ask.