The brand name and model of your laptop determines what processors you can use. Manufactures have their own bios and you have to follow that for the most part (but not always written in stone) Some laptops have a BGA cpu and your not going to upgrade that at all, short of a new motherboard
Just get the fastest newest processor your computer can support or you want to spend. That will be the safest bet your getting a decent upgrade. Out of those, I'd chose the The newer 2.0 GHZ out of the 3, but the processor you listed outside of that will be faster.. your laptop has to support it though.
CPU support in laptops is not the same as in desktops, successfully finding a CPU upgrade for a laptop is slim I managed it by sheer luck, getting an identical laptop into the shop for repair as my own, except it had a better CPU, I double checked everything about it, and it was indeed identical, so I ordered the CPU from the repair laptop, fitted it in my laptop and it worked fine, other than the cooling which wasn't deisgned for that chip, so it runs pretty hot, but small price for it working
You are awesome as always and Your answers are all very useful and also this is very very helpful. Empty Keg makes always a loud noise. I'm so glad because You are so wise and good, long live, Mr Magic.
That's why I typically go for Dell laptops ( Latitudes almost exclusively ). $150 on Ebay buys something really nice and finding information and compatible chips is really easy. I'd never buy one brand new, but off lease/ refurb equipment, lightly used is a great value. It might even be cheaper to replace the laptop rather than upgrade the hardware ( if it's even upgradable )..
Don't you think that it did its time & should not be retired (as total junk by todays standards?) Or ride it to its death, definitely NOT worth upgrading!