The server motherboards normally have zero options for oc... So it may be true that the E5s are locked or it maybe that you are talking about the server board it self that does not support it.. The asrock boards that I am speaking off will offer these settings. Anyone try this that can tell me definitively that these chips are fully locked.... The 3820 has setting for bclk.. 3 if i can recall the review correctly...
"On the Socket LGA 2011 X79 platform, Intel has given enthusiasts a tool that allows the CPU bclock to be adjusted up via a series of Gear Ratios that start at 100 MHz, all the way to 250 MHz. To get the most out of the Core i7 3820, I will have to use the bclock, Gear Ratios, and adjustments of the multiplier to levels lower than 43x. In my first run, I intended to see what kind of bclock tolerance the chip had. Eventually, I was able to push the bclock from 100 MHz to 107 MHz; a pretty decent bclock increase that allowed the chip to scale to 4.6 GHz." From OCC's recent review of the 3820..