We'll explain ACC prececisely in our AMD 790GX chipset review next week. But as you know, AMD SB750 Southbridge supports ACC (Advanced Clock Calibration) technology called to uncover the overclocking potential of AMD Phenom CPUs. New products based on this Southbridge (like 790GX) have already gone on sale as a part of MSI DKA790GX, Biostar TA790GX A2+ and other motherboards.
According to the source, ACC won't be exclusive to AMD for long. If the slide below is true, NVIDIA's plans regarding MCP72/78 unambiguously indicate the complete support of AMD ACC. The company will just have to use the JTAG interface and introduce certain changes into topology, connecting CPU and MCP72/78. The first motherboards on MCP72/78 with ACC support are expected on September 1.
Note that not all MCP72/78-based motherboards can offer ACC support, since it requires hardware modifications.
