Extensa 4620Z CPU and memory upgrade

I would like to add a faster CPU and more memory to my laptop.
CPU-Z is telling me that I have in socket P T2390 CPU and 2 x 1 MB of DDR2.
Chipset is GL960 and graphics is 965 Express Chipset. Bios is V1.33.
Can I install a T5750 CPU on this motherboard and 2 x 2 MB DDR2.
And what is the fastest CPU that can be installed on it?

Intel´s Chipset Identification Utility tells that the chipset is Intel GM965 Express Chipset but CPU-z tells that it is GL960. I must know which it really is because GL960 supports only 533 MHz CPU and GL965 supports also 667 and 800 MHz CPUs.

I installed T5750 CPU and it seems to work fine so this chipset supports 667 MHz CPU. But does it support 800 MHz CPUs? And how much DDR2 memory does Windows Vista support and should it be 667 or 800 MHz DDR2?
Memory is now 2 x 1 MB DDR2 5300 533 MHZ and is it too slow?