one thing I will tell you 8gb ram you may want more ram than that. I have 8gb on my old computer and can not rull all eps without lag. The newer EP's like pets, Island Paradis, Into the future not only need ram but memory and this is per EA. My new computer has 16gb ram and so far no lag on the base game, The more ram the better. The game will run smoother the more ram you have. This game is a ram hog. Video card comes into play too
I can't post a link but google ---mod the sims 3 system requirements they have a guide what video cards are accepted and other things you will need to run this game