http://www.amd.com/us/products/notebook/graphics/amd-radeon-6000m/Pages/amd-radeon-6000m-series.aspx
6500M should be at the level of 57xxM or so (6500M has 500-650MHz clock so hard to say).
6300M should be at the level of 54xxM (again, variable clock speed).
6500M should be at the level of 57xxM or so (6500M has 500-650MHz clock so hard to say).
6300M should be at the level of 54xxM (again, variable clock speed).