I am not trying to interject into your conversation, but there is nothing in common between the normal ASUS ROG XF-I and the G1 Killer series XF-I other than the software. All the ROG boards, with one exception the $600 USD Rampage 3 Extreme Black Edition
all have Realtek Audio Co-Lay ALC889, same audio codec found on almost all GIGABYTE LGA1155 boards. Now the only board that actually has the real creative hardware, which includes the creative audio processor(C20K2), the 1GB DDR memory, the ADCs and DACs, the 5 Audio Amplifiers, and the high quality caps are most of the G1 Killer line(the G1 Guerilla has an ALC889 in place of the creative chip but same other hardware like caps and amps), and the R3EBE which had an almost identical IC list as the Killer series for the audio.
That is all i wanted to say. The ALC889 is also one of the only codecs that can actually run the Creative software and THX studio and so on. The sticker on the ROG board that says XF-I is covering up a Realtek ALC889 lol. I wouldn't be surprised to find the same on the MSI boards. That includes the Maximus 4 Extreme, the maximus 4 Gene-z, the rampage 3 extreme, the Rampage 4 extreme, and many more including the corsshair boards. The thing is that these boards are missing the AMPs, and the external DACs and ADCs and memory that support a Audio processor like creative's.
Now with X79 we might see the new ALC898 be used on higher end motherboards, and don't get my wrong the ALC889(108dB SNR) is the best Realtek chipset there is on the majority of boards. The ALC892 is actually lower speced(98dB SNR).
The whole audio thing going on with boards is quite confusing, but that is why you see higher end boards with ALC889 and lower end with ALC892 lol.
Now ASRock is actually using the Core3D recon chip that creative just came out with, on their X79 extreme 7 with an add-on card, this IC integrates more of those DACs onboard, and the next logical step for G1 is to use that chip instead of C20K2, but I am not sure when or wether they will skip and goto the next best.