768 MB of ram I think on my computer. I need to get DSL first, lol, the game runs crappy on my sweet 56K Modem. I have to play High performance outside of towns, and Extreme performance in towns sometimes to avoid lag.
I will have 2 GB of ram in February when it's my birthday, or maybe Christmas. For Christmas I'm going for an intel Pentium 4 upgrade, from my current intel Celeron.
1 GB of ram is perfect for the game, anymore is just fun to look at for now.