He seems to imply that running the chip at 1600 MHz is somehow preventing the chip from going into C6, and that running an offset is also preventing the chip from going to C6. But I am doing both of those things and my chip is in C3 and C6 a lot. So I'm not sure his argument hangs together. It applies for guys who disable C3 and C6, I guess, but that's really only recommended when someone has a problem in offset mode (in which case it may be better to run a fixed voltage with C3/C6 enabled). But there is no reason why you shouldn't run offset, power saving enabled, and C3/C6 enabled all at the same time, as long as it works.
When using C6, there is no reason to run your CPU slow. Intel has put a lot of thought into their CPUs and especially into the various C States so their CPUs can quickly change states with zero lag or loss of stability. Even when significantly overclocked, a CPU should still be stable when C6 is enabled.
If Intel put so much thought into it, then why do they make the chip idle down to 1600? The stock out of the box behavior is basically offset/all power saving enabled/C3C6 enabled. Which is kind of what he is saying don't do.
I think he needs to be clearer that what he is advocating is leaving C3/C6 enabled even if it means running a fixed voltage instead of offset (in case of problems). I don't see what the multiplier has to do with anything.
This part also makes no sense:
Here's a comparison. Suppose you have a calculation that takes one of your CPU's cores 10 seconds to compute at 4000 MHz. This same task is going to take 2.5 times longer if you are running your CPU at 1600 MHz so at that speed it will take 25 seconds.
At 1600 MHz, your CPU spent 25 seconds at perhaps 0.80 volts (if you can get your CPU down that low so your average voltage is 0.80 volts).
At 4000 MHz, your CPU was at 1.10 volts for 10 seconds and it was at virtually zero volts in C6 for the other 15 seconds. Your average voltage is:
( 1.10 v X 10 seconds ) / 25 seconds = 0.44 volts
Quite a difference. Every time you allow your CPU to "save" power by running it at 1600 MHz, you are doing the exact opposite when C6 is enabled. You need to avoid 1600 MHz and you need to avoid decreasing the core voltage.
No one is forcing their chip to run at 1600 all the time, that's crazy. The chip will always speed up to do the calculation, no matter what the idle behavior is.Edited by Forceman - 2/16/13 at 12:21am