My 4 year old Sager laptop has a GPU module (or slot, so it's essentially like RAM and can be replaced). When the graphic card decided to flip out a few weeks ago I searched around and they were around $230 shipping from China. Even though everything said to me that the problem was just the video card I decided to spend $1600 on a new Sager laptop. Since the old one was now disposable I decided to do the "bake the video card" trick (375 degrees for 10 minutes, in case you're interested - just remove all screws, heat sinks, and thermal paste). I let it cool, applied thermal paste, and gave it a shot - bam, worked like new. Since the new laptop was already in "processing" I decided to let it come anyhow.
The old one is an ATI (HD 6990M). It handles linux gaming alright, it really depends on the game. Windows gaming it's great at - I just don't boot window often. The new laptop has an nvidia because I do feel that the nvidia drivers will be better in linux. Over the past 20 years I've given both companies some love.