The Nook Tablet's OMAP4 CPU includes many significant improvements over the Nook Color's OMAP3 CPU so direct GHz comparisons won't be too meaningful.
The OMAP4 is built around Cortex-A9 ARM cores that are a generation beyond the Cortex-A8 ARM cores in the NC's OMAP3. Highlights include out-of-order execution, speculative execution, superscalar architecture, and much more. Also, the OMAP4 uses LPDDR2 vs LPDDR in the OMAP3. Out-of-order execution alone is pretty significant, and there's a good reason every Intel CPU since the original Pentium has had it. Well, every CPU except their Atom line and it's one of the reasons the Atom CPUs feel slower than an underclocked Core CPU
I can't offer up any scientific testing data, but I can tell you that my wife's NT is much quicker web browsing using Opera than my NC overclocked to 1.2 GHz. Presumably, Opera is taking advantage of those multithreading capabilities.
It's noticeably smoother overall. The NC will tend to "get busy" and just hang until an operation completes, where the NT keeps plugging.
All subjective, of course, and YMMV. If it had been as hackable, I'd have gone with the NT.
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