Foxconn A7DA 3.0 Series User Manual page 39

If you enabled this function, it can significantly reduce the EMI (Electromagnetic Interference)
generated by the system, so to comply with FCC regulation. But if overclocking is activated,
you had better disable it.
► CPU-NB HT Link Speed
HT stands for HyperTransport bus. The CPU<->NB HT Speed option controls the physical
speed of the CPU to Northbridge HT link using multipliers ranging 1x to 13x. The physical
speed of the link is determined by multiplying the CPU FSB with the CPU<->NB HT Speed
setting.
► NCHT Incoming Link Width / NCHT Outcoming Link Width
The coherency refers to the caching of memory, and the HT links between processors are co-
herent HT links as the HT protocol includes messages for managing the cache protocol. Other
(non processor-processor) HT links are Non-Coherent HT links, as they do not have memory
cache.
The HyperTransport link width and frequency are initialized between the adjacent coherent
and/or noncoherent HyperTransport technology devices during the reset sequence.
It is highly recommended to set to [Auto] for overall performance.
► Advanced Clock Calibration
Advanced Clock Calibration, which is ACC for short, is new technology of AMD. It can improve
the stabilization of processor and enable greater performance tuning margin for the AMD Phe-
nom Black Edition CPUs. It also can achieve higher frequency in normal voltage, adjust CPU
TM
voltage to increase the amplitude of CPU multiplier. Some problems that need to be noticed
to achieve the function, including AMD OverDrive tool and compatible BIOS. Setting values
are:[Disabled], [Auto], [All Cores], [Per Core].
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