This article over at LegitReviews is a must-read for anyone with this model of Dell notebook. Even if you don't own a E1705, it's a good article to reference if you ever get the stones to upgrade your laptop's video card.

"Take a look and see what we did with the Dell e1705 Laptop. Jason Petermann took his personal laptop and opened it up to show you how to upgrade to an NVIDIA 7800Go graphics solution."