The Great Equalizer: Apple, Android & Windows Tablet GPUs Compared using GL/DXBenchmark 2.7
http://www.anandtech.com/show/6872/the-great-equalizer-apple-android-windows-tablets-compared-using-gldxbenchmark-27
"As the name difference implies, DXBenchmark uses Microsoft's DirectX API;
while GLBenchmark relies on OpenGL ES."
"Looking at the offscreen results, we finally get what we came here for. Intel's HD 4000 manages to deliver 3x the performance of the PowerVR SGX 554MP4, obviously at a much higher power consumption level as well."
The Ivy Bridge CPU used in Surface Pro carries a 17W TDP, and it's likely that the A6X used in the iPad 4 is somewhere south of 5W.
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