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Graphics comparison:

Tegra 3 (Kal-El) @ 300 Mhz: 7.2 Gflops

A5X (2 x Power VR SGX MP2): 2 x 19.2 Gflops = 38.4 Gflops

Actual GPU clock on Tegra 3 unknown (in this article) but if it was 400 Mhz that would be 9.6 Gflops which would be exactly 1/4 of the A5X.

On Anandtech today they say the actual speeds may be 250 Mhz and 333 Mhz. The same math basically holds.

Is the dual-core in the A5X faster than in the A5, excluding the GPU?

Unknown. We'll have to wait for some benchmarks to see the clock speed.