It’s not all rosy with Nehalem. We've learned that in spite of its 4GHz+ overclocking potential on air, that there are some limitations. You simply cannot get more than 1.65V to the chip which might be a limiting factor for high-end overclocking.

Its gets better, as the CPU and memory voltage have to be synchronous which implies that not all DDR3 memory will run with Nehalem. At this time you can forget all DDR3 2000 modules with voltages over 1.65V, as they simply won’t work on current Nehalem motherboards.

We know that Intel is aware of the issue, but we don’t know if it can actually fix it. Memory people most certainly won’t like it if it stays that way.