How big will your screen regions be?

I have my main: 1600x1200 on screen 1
3x 800x600 on screen 2

And my performance window takes around 5.5-6gb ram in Alterac Valley. I only use 5 characters in instances or while leveling, in AV it would lag too much.

So yeah i think you should buy more ram, and i have all my video effects on low, except spell detail on medium and view-in-distance on max.

Kind regards,

Steven