One thing to consider (at that specs it wouldn't matter much but i see those settings in-game): if u are going to do that u must not use texture correction, like msaa, because your cpu will have to handle even more pixels than the display ones. Also, u should buy a cpu corresponding to its gpu: it shouldn't be mucchhhh better but it shouldn't be worse because it will bottleneck.
Litteraly, if u buy a expensive gpu u must buy a expensive cpu, to get the most out of it.