the A10 isn't high end, it's low end with a built in GPU.
The I7 is excellent for everything and whilst it's not really needed for gaming as the 4 core I5 is enough, some games are now taking advantage of 8 threads allowing the I7 to give better performance.
That said, the GPU is easily the most important. CPU's only really become important in CPU intensive gaming, there are some recently like BF4 and even crisis 3 is CPU intensive. You can only really find this out by reading benchmarks which happen to compare different CPUs, although most benchmarks are GPU limited, so don't really show any difference between CPUs unless something really low end is used (like the A10).