Installing your laptop's customized AMD Driver will solve the problem.
AMD generic Drivers in most case won't correctly identify the exact GPU model in your laptop but it will be compatible and should work. It may not use all of your laptop's features though.
That is because it is a m330. The 520 is a rebadge of the m330 which was a rebadge of the m230. Your driver is seeing it just fine. Regardless they all use the same driver. As already pointed out. If your laptops maker did anything in the way of a change to the driver, it won't be in the AMD Vanilla driver. You should always use a driver from the OEM if possible.