Few notes:
a) Not to surprising all three Asus cards produced good results
b) ARS didn't benchmark Realtek 898 CODEC, but it's specific implementation in Hi-End Mobo from (probably) The Best Producer of Hi-End mobos - Asus .
Yes, it's cheesy, but I hope I got my point across - Same codec may perform very poorly depends on overall mobo design -
Case in point my home pc mobo - ASRock P67 EXTREME4 B3 (Asrock is asus's budget brand) which has Realtek ALC892 codec - was implemented very poorly, or at-least it's analog portion - it's extremely noisy and absolutely unusable -
That said my work pc - HP Pavilion Elite HPE Machine with older Realtek 888 Codec is very usable and isolated much better....