 The first of these two chips, codenamed "Napa", controls the I/O functions, RAM access, the Audio DSP, and the actual GPU with its embedded DRAM, and measures 8 × 9 mm.The other, codenamed "Vegas", holds 24 MB of "internal" 1T-SRAM and measures 13.5 × 7 mm.The Texture Environment Unit (TEV) is a unique piece of hardware exclusive to the GameCube and Wii.