EDIT: Have read more into comparing CPU's and found out that the same family CPU's performance difference is reflected by clock speed pretty accurately, unlike comparing different families CPU's. Since both SU9400 and SP9600 are from Intel Core 2 Duo Mobile family, SP9600 has double the L2 cache, 80% higher clock speed, 33% higher FSB bus speed, is it reasonable to expect around 80% performance increase?
You MUST contact Lenovo and ask them which processors are compatible with THEIR bios. Then, you can select from those processors.
An upgrade CPU must be socket, BIOS, and chipset compatible. And, that is only if the existing processor is NOT soldered to the motherboard.
Also, in my opinion, with a PC/Laptop that is already nine years old, you will be wasting your time.
It's not a question of financial efficiency, this laptop has sentimental value to me. I am getting BIOS modified to support this CPU, as well as the soldering done by a professional. Already confirmed that this can be done, so it's out of question. I was only asking about performance increase, but thanks for you reply anyways:)
I never mentioned financial efficiency, although the amount of time and effort, and likely failure, will cost more than a new/current laptop. This amount of effort, on a nine year old laptop, seems counter-productive.
Just for kicks, you can compare the two processors here: ARK | Compare Intel® Products
Good luck with your upgrade.
This message was posted on behalf of Intel Corporation
Great information provided by Doc. He has given the proper information about this type of upgrade process.
Please bear in mind that Intel does not provide percentage information when changing or upgrading from one processor to another. Also, this will depend on BIOS, socket and motherboard configuration.