Mining with a CPU hasn't made much sense for a while now. Check out this wiki article in answer to your question: https://en.bitcoin.it/wiki/Why_a_GPU_mines_faster_than_a_CPU

https://www.weusecoins.com/en/mining-guide also offers some good information to read.

Unfortunately, with the hardware you have it may not make sense to mine if you account for your electricity costs. It comes down to what your motivations are for mining.