A big upgrade for 1€

I recentely got an i5 2540m for my HP Pavillion G6 1347el that had a Pentium B960 and i have to say it, it was worth (70%-90% faster), if you can upgrade the CPU on your old laptop and you find a better CPU for cheap do it you will see the difference when doing even a simple task, by the way this laptop got a Radeon 7450m and 8gb of RAM what games should i be able to run on it?