Uhm, it might be branded by ASUS but are you sure it's not Intel SRT as normal with an ASUS marketing spin slapped on it?
I would be quite surprised if it was not Intel SRT seeing as the board ONLY has an Intel SATA controller for internal SATA drives.
The X79 chipset doesn't support Intel SRT so it must be something else.
Either something of Asus's own design or perhaps software the same or similar to that used with drives like the Corsair CSSD-C60GB Accelerator Series or OCZ Synapse Cache.
Any reason why? Will an updated Option ROM enable it in the future?