What is the difference between laptop and desktop GPUs?

[Windows Central]

What does the 'M' mean in a graphics card's number?
Anyone who has shopped around for a gaming rig knows that the graphics card (GPU) is arguably the most important thing to consider. Without an appropriate graphics card for the games you want to play, you'll be stuck with sub-par graphics and an overall disappointing experience.

Full story from the WindowsCentral blog...