The Intel IDF Conference is going on as we speak, and Hardware-Infos.com (auf Deutsch) is reporting that Nehalems will have a mode similar to Santa Rosa Meroms where the chip will dynamically "overclock" itself on the fly on a single core when the need for high performance on a single execution thread is indicated. At this point, it's being called a Turbo-Mode, even though the Intel branding for this feature is unknown at this time. Details are still sketchy, but this is another very interesting detail about the i7/Nehalem platform.
In layman's terms, let's say you have a 4-core, 2.66 GHz CPU. If you're running something that only uses one core, but needs all the power it can get, you have no benefit over a 2.66 GHz dual-core CPU or even a theoretical single core version of the same. These are already maximum speeds, with the CPUs running at lower speeds when performance isn't needed. What this system will do is transparently to the user allow a single core to go faster than the rated maximum while reducing maximum speed on the remaining cores. No word yet on if this will work on a system that's already overclocked. I hope to have more info as this leaks out into the English language press.
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