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Let's compare some chip specs for Mali GPUs:

500 MHz (28 nm)
Mali400-MP4: 55 M tri/s + 2 GPix/s

650 MHz (28 nm)
Mali450-MP4: 142 M tri/s + 2.6 GPix/s
Mali450-MP8: 142 M tri/s + 5.2 GPix/s
*triangle counts same meaning similar number of vertex processors between MP4 & MP8 Mali450s.

Mali-T604: ARM doesn't provide specs and have to use benchmarks to compare with instead

We can see above that Mali450-MP8 has 3X # of triangles & 2.6X Pixels/s than Mali400 but only because of the somewhat higher clock speed. At same clock speed would only yield 2X actual performance improvement and mobile under 15000

Your link to GLBench 2.5 Egypt 1080P offscreen shows:
T604 (Nexus10) - 32.9 FPS
Mali400 (SGS3) - 13 FPS

I would guess:
Mali450-MP8 - 26 FPS
Mali450-MP4 - 14-18 FPS

At same 500 MHz clock speed,

4G mobile under rs 4000
 
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