What are the upgrades I can get on a Dell Studio 1555 Laptop? like video cards, memory, etc.?

Video cards???? I have the 300 GB, Mobile Intel 4 Series Express Chipset Family, 4GB RAM version|||When it comes to upgrades, that is when you start wishing you had bought a desktop. The only thing you can upgrade is RAM or HDD. If you want a faster HDD, go for SSD (solid-state drives).