I recently purchased a pre-built desktop, that came with an AMD Fx 4300, 8gb ddr3, a amd r7 240 2 GB GPU, and a 1tb 7200rpm hdd. I have already swapped out the GPU with an NVIDIA GeForce GTX 1050 ti sc 4 GB gddr5. I would like to swap the CPU with something more powerful, but still want to use the same mobo wich has an AM3+ socket. Any suggestions that will work? Thanks.