That depends on a number of factors, including how much you're willing to invest, and what your electricity cost is.

It is no longer profitable to mine bitcoin itself with GPU/CPU's, you can however still mine altcoins with your GPU. See https://www.nicehash.com/profitability-calculator/

You'll need an ASIC to mine bitcoin. Like this one, https://shop.bitmain.com/antminer_s9_asic_bitcoin_miner.htm