Instructions
Look at the bottom panel on your Wii console. You will see a number listed as "Serial No." The number will have two or three letters, followed by nine digits, including a digit in a box at the end, which is still part of the serial number. Write this entire number down.
Visit either the "Nintendo Scene" or "Wii Drives" websites.
Enter in your serial number into the database on the website. Click "Go" to input your serial and the chipset version will display on the screen. The "Wii Drives" site will also include a list of known modchips that will work with your chipset.