Hi,I am going to upgrade my laptops RAM and I used the crucial scanner to try and match my RAM but I don't want to buy their RAM,I want corsair RAM so I had a look on ebay and found some similar RAM using the crucial results but when I asked the sellers if it would match my laptop,they were unsure and asked if I could take a pic of the RAM so they could check.
This made me wonder what information do I really need to know when choosing to upgrade to either better RAM or replace existing RAM with the same match without having to ask sellers will this be compatible?
So far the only things I know are that DIMM is seemingly for desktops and SODIMM for laptops.
I have seen SODIMM RAM which is 200 pin and also 204 pin,how many different types of connection are there?
What about voltages,do they have to match etc?
Can you upgrade RAM from DDR2 to DDR3 or are can you only put in what your board can accept?
Does CL have to match or can you put any different CL in?
What does PC2 PC3 mean etc?
Any help in understanding RAM is appreciated.