AnTuTu 3DRating is a professional GPU performance test application. 3DRating only focus on 3D part of GPU in devices, while 3D performance is the key performance to game softwares.
The higher the score, the better 3D performance the device has. Thus the device can run corresponding games according to its 3D performance. GPU is different from CPU which can not make up by CPU. You may found that some quad-core CPU devices' GPU performance are worse than single-core CPU devices'.