I this is a pretty much dead thread but it's been bothering me. I see alot of sites giving the same or incomplete answers. Or wrong. I've ordered a i5 520m mobo to replace the i540m that I've have. they are pretty much evenly matched to the "T". I just want too see the true embedded options are in the CPU. The so called"fixed"CPU is soldered to board known as "integrated or hard fixed" to the MOBO. I'll post my findings soon as it's put into my machine. Which is a Dell E4310 I built. See you soon guy's. Onizine13.