The card in the M70 is more stable, so it produces more accurate graphics. The card in the 9300 is at regular clock speed, so it's faster, which means faster graphics. That's why people use it for gaming.
It obviously depends on what application your using,Maya may work fine,solidworks and others possibly won't,Leadtek's website has some good information on the differences between quadro and geforce cards.It's not just a case of the quadro is clocked lower and thats it http://www.leadtek.com.tw/eng/suppor...p?faqlineid=44
I know with solidworks using a quadro allows you to display models with materials displayed in realtime[not rendered] and realistically [chrome looks and reflects etc like real chrome does]besides other things like model lines refreshing properly and being able to have a lot of different model/part windows open at the same time without slowing to a standstill or crashing.
However my comparisons are based on radeon v quadro cards so I'm probably just talking shit
If youre still in a dilemma, I suggest you contact "antskip" or "theelement" as they are familiar with the programs you may be using and could probably lend a better perspective to the situation.
I have also read of Inspiron 6000 owners using 3d programs without any troubles, just a few years back a laptop with a 128 meg card would have been unthinkable.