Since testing shows little if any tangible gain with OC'ed RAM except on APUs, this is more marketing fluff than actual value.
When AMD actually has unified RAM access then this might mean something but for now it's mostly hype.

Asrock Mainboards to Support AMD-Specific AMP Memory
[07/27/2012 07:01 PM]
Asrock, one of the most-admired makers of mainboards according to an X-bit labs survey, said that through a new BIOS update its flagship AM3+ mainboard will support AMD-specific memory modules with serial presence detect (SPD) containing special timings for microprocessors designed by AMD.
"Asrock's flagship board Fatal1ty 990FX professional is the only on-sale motherboard offering AMD AMP memory overclocking kit in the consumer market, stepping to the future memory overclocking now," a statement by Asrock reads.

Asrock indicated that its top-of-the-range Fatal1ty 990FX Professional mainboard which has AM3+ socket that supports both current FX "Bulldozer" chips as well as forthcoming FX "Piledriver" central processing units is now also compatible with AMD's AMP (AMD Memory Profile) SPD settings which allow overclockers and enthusiasts to easily get more speed from their memory modules by choosing exact clock-speed and latency settings [which are presented] without faithfully harming the chips.
Potentially, the improvement of supporting pg AMD's AMP-compatible memory chips should enable frequencies ahead of 2.8GHz speeds (supported by Trinity officially) from default of 2.1GHz for memory, which is a rather high frequency.
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