More often than not Windows 7 still isn't significantly faster than significantly older versions of Windows that predate WDDM entirely.
On a dual-core, with 3GiB or less memory, using DX9, Windows 2000 probably isn't noticeably different from Windows 8 as far as game performance goes.
No one should expect current games, using current APIs, to benefit significantly from WDDM 1.2. New software or more complex usage scenarios than most encounter when gaming will likely be needed for any differences to really become evident.
Originally Posted by Artikbot
Framerates may stay the same, but it stutters less, has less framedrops...
I haven't noticed any difference in smoothness.
Originally Posted by zrlan7710
Because there are many factors to consider i.e. your eyes, etc.
Bigger factor is probably that there isn't any difference, in most cases.