ok my friend wants to know how he can check his ram on his computer because hes wanting to upgrade and doesnt know what pin size he needs, how can he check it
Have him try Crucial's System Scanner. It will scan and analyze his system and tell him exactly what type of memory he has installed and what memory will be compatible with his computer.
Another nifty program is CPU-Z. It will tell him all about the CPU, motherboard and memory.
A lot of time, if you take out your old RAM, it will tell you on the sticker. All of my RAM has that so it makes it easy to identify. You just have to take it out of your system and see.