No, not anymore. Today there is hardware constructed specifically to mine X11-based cryptocurrencies (Dash being the most well-known). This hardware is called an ASIC, or Application-specific integrated circuit. The ASIC market changes quickly, so I won't attempt to list the machines that are today the most powerful as they will likely soon be surpassed. Feel free to do your own research into them if you are interested in mining Dash. Or another option is a mining pool.