Yes I know it is an old laptop. But if I make it run a bit faster by spending £20 to £ 30, it is worth doing.

current spec:

Intel Celeron M 550 (Socket 479 mPGA, 2.00GHz ) on Dell 0U990C Motherboard.

I am having trouble to select an comptable CPU for it.

Target CPUs but I am not sure about the 479 mPGA :

• Intel Mobile Celeron Dual-Core T3100 (478-pin micro-FCPGA package)---478?
• T3300 and T3500 which have the same  478 socket
• Intel Core 2 Duo Mobile T5750 (479-ball micro-FCBGA)---479 Yes, but BGA?

can anyone advice on which CPU to use, or anything else that I should consider? Your help is very much appreciated!

Even better if someone has done this before?

Regards