You'll be able to 5-box without any problems on that laptop. I'm currently 5-boxing on the XPS laptop model right before that one. I have a 1710 XPS with Vista Ultimate, 4GB RAM, and a single 7200 rpm drive. When I first started multiboxing I didn't know about the max fps flag and had some occasional lag. After I set my windows to 50 max fps when focused and 15 fps when in the background, I've had no performance or heating problems at all.