And for most laptops there is no "card" and when you consider you can't use 100 Watts to drive the GPU at full tilt then you begin to understand.
Good idea to check benchmarks if you are looking at a gaming PC.
But here's my parting thought. That benchmark would blow away laptop machines from just 2 year ago. Maybe this is a moving target?
I like to refer to this site below about benchmark for 5470:
I am quite surprised about how badly this card performs. Looking at ATI Mobility 5730 that also came out earlier this year, the benchmark performances between these two cards are like heaven and earth. Even some of the 4000 cards perform better than 5470.