For mac : http://kiguino.moos.io/2014/12/31/how-to-use-arduino-nano-mini-pro-with-CH340G-on-mac-osx-yosemite.html
For windows http://www.jens-bretschneider.de/aktuelle-treiber-fur-seriell-zu-usb-adapter/
Hereby declare:
In the same performance guarantee NANO and master chip ATMEGA328P-AU same premise, We replaced the USB chip,Improved download speed, Increase the stability of the win7 win8. But it does not support well MAC.