Overview of nVidia nForce chipset

In article Im described the two major incarnations of the nForce chipset, the nForce 220 and the nForce 420. The only difference between the two is the presence (or lack thereof) the TwinBank memory controllers; the nForce 420 uses the 128-bit TwinBank memory controllers and thus has the IGP-128 while the nForce 220 has the 64-bit IGP-64. Another designation is made among chipsets based on the presence of the Dolby Digital license for the MCP.