Alright, I have some questions about Laptop ram. I've done ram upgrades for PCs before, dead easy, but I've never done laptops so I have a few questions. When choosing new RAM, obviously I can't buy PC ram, it has to be Laptop ram, but are there different kinds of RAM to be careful about, like different voltages, pins, etc? I know my laptop model, it's a Toshiba Satellite Pro u400 (.pdf spec), if I were to buy from say, Novatech (ram page), which options would be a no go? Or would I have to buy specially designed RAM for the laptop? That also brings me to my new question, if I were to install 4gb of new ram on my laptop, that would give me 2x1gb spare that I'd want to put in my mum's laptop. (She's running Vista with 1gb) Would I be able to just take out my Laptop's ram, and safely put it in hers? She is using a HP Compaq Presarion F500 (.pdf spec). I know it has 2x512mb RAM. So, can anyone help? I'd appreciate it a lot.