Instructions
Look on the bottom of your Nintendo Wii and find the serial number. This number is 13 characters long with three letters and 10 digits. The last digit will be in a box. The serial number can be found underneath the bar code.
Go online to Nintendo-Scene Wiitracker Search into the address bar. This is a database of all the different Wii chip sets correlating to the different serial numbers. There are other sites you can go to for checking your chip set, but the Nintendo Scene site is the easiest to use.
Enter your Wii's serial number into the search bar at the top of the page and click the "Go" button next to it. Your Wii's chip set information will then pop-up on the screen.