Here is the 6620G laptop claiming it has discrete graphics 512MB dedicated on Newegg.http://www.newegg.com/Product/Product.aspx?Item=N82E16834215187
Here is the product page on Acer claiming it is shared memory. I'll trust them. I guess Newegg has it listed wrong.http://us.acer.com/ac/en/US/content/model/LX.RNT02.069
I've looked over several laptop models using the 6620G and they're all claiming it's shared memory. Which pretty much answers my question.
However, if anyone has any more insight on this subject, please let me know.