O geez i just noticed you want to put the 65 nm in the new laptop lol that will defitnly not work. even with the 4300 haveing less cach should still be the same performance in everyday apps you will notice no difference.
I understand that the fabrication difference is a huge one, but as a query I was wondering why they do not work ? after all the voltage ranges and the socket types match ... The reason why I want to do it is I have seen very discrenable difference in speed when I do run Photoshop + MatLab say ... on my old computer (3Gb) and someone else's computer (4Gb) with the 4300 or the 6600 processors.