i will say something really funny... i got only 4 GB in my personal PC. and, in my office PC, i got only 6 GB ith Windows 7 ultimate 64 bits. one day, i will purchase a mac. and it will be awesome
I have 16GB and it's definitely the best for just general use of a computer, higher is just overkill unless you're trying to play like flight simulator games cause they really do take up a ton of RAM