Just like on the first part of this test, we concluded that, on some games, an old high-end CPU can give a good performance, while on another ones, newer processors are better. Basically, it depends on where the “bottleneck” is: some games (like Battlefield 4 and The Witcher 3) need a powerful video card, so the performance was limited by the mainstream video card, not by the CPU. On the other hand, on games like GTA V and Dying Light, the CPU is highly taxed, which means a new mainstream processor like the Core i3-4150 will give more performance than an old or a value processor.
An important detail is that the Core 2 Quad Q8300 was not faster than the Pentium G3220 on any game, even having four processing cores, against only two of the Pentium.
So, our conclusion is simple: the Core 2 Quad Q8300 is not faster than a basic modern CPU on games. A modern mainstream processor is still the best choice.
However, please keep in mind that this result is valid for the configuration we used. A different old CPU, with different games and video card, can present a different behavior.