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Your exisiting model will support 2.5 inch SSD models .
The newer model like thin laptops are now coming with Mw form factor which is 3 times faster that 2.54 inch SSD .
You can buy the M2 models you have specified but after that you need to buy an encloser for M2 which will convert that to 2.5 inch form factor like below
Yes it will work upto 6gbps data transfer .
An M.2 SSD utilizes the PCIe data lanes on a motherboard to send and receive information, which is why that are referenced
bits per second
Yes you are correct . For older model the upgrade is not so helpful .