I don't know about shaders, but according to the hardware chart, the 6470M will hit 31.0Mhash/s. I wouldn't recommend mining with the mobility GPUs (they are designed for laptops). You'll likely fry it running full blast 24/7; it will not be able to dissipate the heat fast enough. Buy a desktop if you are going to mine.

https://en.bitcoin.it/wiki/Mining_hardware_comparison

-SteveA