I also had this squealing problem with a Gigabyte X58 UD4P motherboard when I had an i7 920. It was worse on that board because it would also squeal while moving the mouse if I had any of the C-state options enabled in the BIOS with Vcore on Auto or Normal setting. I returned that board and bought the same one at a different store location and it still had the same squealing problem so I decided to just disable all the C-states options in the BIOS as a workaround to that problem. I tried a different brand board and it would not boot up.
Disabling C1E does not cripple the turbo boost. Disabling C3 and C6 states cripple the turbo boost but not totally disable the turbo boost.
Anyways I called Asus about the problem with my P9X79 Pro, got an Case#, and now I'm waiting for email from Asus to get the RMA started. They said they could do an advanced RMA. I hope I'm not wasting my time and money (shipping) RMA'ing the board.
To be honest I stayed ignorant to what C1E and other C states actually did other than knowing it was something to do with power management. I read up on it last night after posting.
It seems it effects turbo mode only in single threaded apps in that the other CPU cores will not down clock enough in order for the turbo mode to hit its peak for one core only, if that makes any sense.
This morning I enabled all the states again, the sqealing was not nearly as bad as it was when I first built the system - I upgraded to Win 7 from Vista, new SSD, sound card and video card since I built this back in May 2009. I tested Arma 2: OA and it made shit all difference to performance, CPUz reported CPU clock running at 2.8GHz. So I disabled C states and tried Arma 2 again, CPU clock still running at 2.8GHz and no difference in performance in Arma 2. I know this chips max turbo mode is 2.9Ghz in single threaded apps, but 100Mhz is nothing.
The PC felt less snappy with C states enabled as well, there was a slight delay when opening Windows explorer objects. In fact my motherboard had the 'C State Tech' (C2, C3, C4) option in BIOS disabled by default. I read on the ASUS forums it is reccomended to keep this disabled for the home user but keep C1E enabled.
How did the 2600K handle C states? I take it this CPU was silent?
Have you benchmarked any games with your 3930K, with and without C states enabled? Your activity in this thread has been very useful for me as I am considering upgrading to the LGA2011 platform myself.
I was thinking of maybe downgrading to an i7 3820 from an i7 3930k because MC has the i7 3820 on sale for $249.99 right now. I don't really seem to being taking advantage of all 6 cores except in FSX where I get a little shorter load times and a little quicker texture loading, but that's all I'm seeing in terms of gaming. Even if I decided to sell my i7 3930 and replacement motherboard (if it doesn't have the squealing problem), I would be out lots of money, and barely anything to show for after losing all the money. I'd guess I would lose around $260-$300 after shipping, Ebay, and Paypal fees. Used motherboards don't seem to have as good resale value as used processors based on what I see.
Sounds like you are a bit of a perfectionist like me, you want everything working correctly, having to disable features, even with minimum performance impact still feels like a destitute on the overall build. More so if you have come from something which performed the same and but cost you more money to build.
The thing is the 3930K is a very good chip, and you might not see any increase in performance now but you do not know what is round the corner.
I heard BF3 does take advantage of more than 8 threads, and people on this forum who have upgraded from a 2600K to a 3930K have said the overall smoothness has increased in 64 player BF3.
It reminds me of back end 2007 when the Q6600 could be had for about £250, everyone was reccomending higher clocked dual cores as they were "faster for gaming" and only quad core chips should be considered if you was doing rendering or such like. Look how that turned out...
I upgraded from a E8500 C2D to the i7 920 and some of the older games I played at the time (mostly Red Orchestra) felt less smooth on the 920 than the E8500. In todays apps there is no way the E8500 would have been a better solution than the 920 if I had based my perception of performance just on those older games at that time.
Ivy will no doubt be faster in current games than the six core 2011 chips, but I think the performance will be negligible when it comes down to actually been able to tell a difference. At the end of the day you have some serious professional grade kit with the LGA 2011 platform and I think the 2011 6 core chips will have a longer lifespan overall.
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