3dmark 11 phys score low ?

i highly doubt it is related to your ram. many do not like to populate both channels of ram with other issues arising. as for your physix score, i dont know. i dont think 3dmark uses nvidia gpus for physix calculations, but im sure there is a way for force it.
 



Almost everyone score 10 000 with stock @ 4.0, 4.4 turbo, there is a problem for sure