Graphics and RAM shouldn't be an issue... This isn't an issue that has happened.. VER, before 0.1.9.1 ... That is when O started getting this issue... I used to play MP for coming close to 12 hours at any given time, but since this update, It struggles to get more than 4 hours of gameplay from time to time.
But if you Should know...
I have an integrated Chipset @ 256mb Dedicated and annoyingly have 3gb of RAM, because my mother thought that was a good amount to have -.-