The Intel HD 3000 graphics core is pretty weak, I would avoid purchasing the above laptop. It was decent enough when it was released, but not now. I would buy the Acer Apsire with the 6th generation Core i5 CPU.
The 6th gen Core i5-6200u (2.3GHz / 2.8GHz) is about equal to a 2nd gen Core i5 CPU running at 2.75GHz / 3.37GHz. The 6th gen Intel HD 520 is definitely more powerful than the 2nd gen Intel HD 3000. On average the Intel HD 520 is probably around 70% - 80% more powerful than the HD 3000.
I have a Lenovo Y470 with a 2nd generation Core i5-2410m and the Intel HD 3000. I also have a Dell Latitude 3540 laptop with a 4th generation Core i5-4200u and the Intel HD 4400; it has a dedicated Radeon HD 8850m as well. I tested Skyrim with all the DLCs sometime ago with a mix of low and mediums settings (shadows disabled and no anti-aliasing) @ 1366x768 resolution on both laptops (because the Y470 is limited to 1366x768) and only using the Intel HD 3000 / 4400 graphic cores.
The FPS performance on Lenovo laptop generally ranged between 25 FPS to 35 FPS. While on the Dell laptop the FPS performance generally ranged between 45 - 55 FPS.
Click the link below that compares the performance of the Intel HD 3000 / 4400 / 520 in some older games. The Intel HD 3000 is not benchmarked in more recent games and there is no real point in benchmarking the Intel HD 520 in most of the older games.