Originally Posted by Rubers
I think so, yes. Since they underclock the CPU at various moments which drops the voltage and multipliers dramatically (at times) and this can cause instability when going form a high overclock such as 4.8, to something a lot smaller around 3GHz in moments. This is why we don't just stick a CPU into a machine and go from 3.GHz, to 4.8GHz in one go, we raise incrementally
Those C1E/C3/C6 numbers are the different sleep states of the chip.
Basically, when the chip isn't calculating, it goes into a low power state, C1, and then "deep sleep," C3, when idle for a longer period of time, and then "deeper sleep," C6, when idle for even longer.
These don't affect stability unless you have an unstable (or barely stable) overclock that you are trying to make work. Most people will witness BSOD's with those on, because as the chip comes out of sleep, there is a sudden demand for power, and they are riding the voltage too close to the edge.
In my opinion C3/C6 states should be included in the overclock, unless going for suicide runs. No one wants their processor running full bore all the time, it's a great way to build up heat and a big power bill.
This article is a little old, since it doesn't include C1E or C6, but you get the basic idea.
http://www.intel.com/support/processors/sb/CS-028739.htmEdited by SectorNine50 - 4/8/12 at 9:26am