Hi All, 1st post here.
Being a HD5870 owner I've been wondering about this myself,
I think I have the answer, "NEW CUSTOMERS ONLY"
It seems mixed resolution eyefinity is ONLY supported on R series cards
Pay close attention to
Quote "All AMD Radeon™ R7 Series and R9 Series graphics cards support mixed resolutions."
I can only believe this has been done to push sales as many HD5000 to HD7000 series cards could handle Mixed eyefinity...
Disapointed in you AMD
PC Engineer with my own Computer Shop
11:46 AM by