Firstly, it's good that you are considering an upgrade CPU wise. In your case if you had to choose between one, I would suggest you purchase the GTX 480 as that will result in better performance in games than by upgrading to an FX 8*** core CPU and retaining your present GPU. Coming to your mobo, I see it's a 4+1 vrm layout with no heatsinks. The other major problem is that the mobo only has a 4 pin power input from the PSU, which means you will be somewhat limited when it comes to overclocking not only by the vrms of your motherboard but also by the amount of power that your mobo can draw from your PSU. The RX 480 will be quite a respectable upgrade from what you currently have. I've noticed that at higher resolutions CPUs don't matter as much as the GPUs are already getting a good work out. If you do consider overclocking your present FX 6100, you're going to need vrm heatsinks and a fan to provide active cooling to the vrm area of your motherboard. Don't go crazy on the voltage and ensure that you have a decent cooler. The cooler your chip is, the happier your motherboard will be leading to better overall stability. If I were you and was mainly concentrating on boosting performance in games, I'd go for the GPU upgrade in a heart beat.