Fragmenting the DirectX install base is the last thing that Microsoft should be doing, though it's not at all surprising.
aesir05 wrote on Nov 12, 2012, 10:18: atleast with win7 I heard some random talk of XP not able to support it and what not, but this...this is just marketing
Actually the Windows 8 graphics sub-system has been upgraded to WDDM 1.2, which should make it more robust. It's one of the reasons why AMD has dropped support for all cards older than the 5xxx series. Is that a valid excuse to not bring DX11.1 to Vista and 7? No. As you say, it's a shitty marketing move.