N900 already has a faster CPU as Cortex A8 is 1.5X to 2X as fast as the ARM11 in S^3 devices. Broadcom's GPU is on par with PowerVR SGX535 which is a bit quicker than SGX530 (N900). Broadcom chip is really good only at media encoding / decoding, as processing 12mpix cmos sensor data in a fraction of a second requires plenty of number crunching.

So if N9/950 was using only single core 1GHz A8 core with SGX540 gpu, it would be quite a lot faster than E7. Of course I'd still rather see N9/950 using TI OMAP4 SoC. More horse power, more possibilities.