NVIDIA has already given its laptop graphics offerings a bit of a boost at CES, and now AMD has followed suit, with it taking the wraps off its new ATI Mobility Radeon HD 4000 series chips. As you may have guessed, these are based on the same core architecture as AMD's 4000 series of desktop graphics cards, and they promise to be as much as twice as fast as their 3000 series predecessors. Helping out significantly on that front is the use of GDDR5 memory, a first for laptop graphics, as well as an increase in the number of stream processing units (800 on the top end HD 4870 and 4850), and a new, cooler 55nm manufacturing process. In addition to those top end graphics options, AMD will also introduce a couple of new 4600 series cards, which use the same GDDR3 memory and 320 stream processing units as before, but are able to fit in tighter enclosures and use less power. Look for the first laptops equipped with the graphics to start rolling out by the end of March.