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Probably more powerful than a Tegra 2 but not a Tegra 3, not even in the same league.

1.5Ghz Cortex-A9 pf OMAP4460 is faster than 1.3Ghz Cortex-A9 of Tegra3, and OMAP4 memory bandwidth is faster than Tegra3.

1.5 ghz is in turbo, usually stay at 1.2 ghz which is slower than 1.3. the memory bandwidth is higher yes, but the difference is negligible
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Also a dual core omap 4 is very different from the quad core tegra 3, the omap 4 is limited to ddr 2  and pushed to the limit while tegra 3 uses ddr 2 and ddr 3, alot more efficient. The cpu speed is also almost even, the tegra 3 uses a 1.5 ghz single core to save power and turns it down to 1.4 ghz when it runs in quad mode compared to the dual core 1.5 ghz omap 4.

Not true. Archos peaks at 1.5Ghz when peak is required, Tegra3 peaks at 1.3Ghz when peak is required. The memory bandwidth is higher on Archos yet the Archos is 40% cheaper than the Tegra3 tablet such as the Transformer Prime.

Everywhere that i have read, has tegra 3 peaking at 1.4ghz. To only compare the price on 1 tablet and say its 40% cheaper meaningless. tegra 3 is in more than 1 tablet, i just so happens that the prime was the first and most expensive.