Indeed, very interesting discussion here.
@dsr07mm
For a core clock of 1244 (says 3D Mark) your graphic score of 12952 looks ok.
I'm only wondering that you are using two different RAM modules.
@Parafuzeta
Setting the temp limit to 70°C solved the problem for my
Asus Black 970 (GPU:1453, VRAM: 1853, Power target: 120%, no voltage tweaks). However, at the moment I prefer 1408/1853 for quiter cooling. Driver is 353.30.
Witcher 3 runs at 35-50 fps. Everything on max at 2560x1440, hairworks off, chromatic aberrations off.
@guanyu210379
looks similar for me, the Asus will produce artefacts in Witcher at 1478 (+225), but not during a normal run of 3D Mark, the VRAM goes without problems to 1978 (+450), not tested further,
btw. here is one score for 1478/1953
http://www.3dmark.com/fs/5211463 it is 14% faster than without OC
http://www.3dmark.com/fs/5231282
The GPU boost remains in games always constant at max level. ASIC score is 61.4