It's 400mhz actually. The max turbo of the 4790k is using all four cores is 4.2Ghz, 4.4Ghz is with a single core. Some motherboards have ways around this but that is outside the Intel spec. It is crap for overclocking though. in fact it's the worst overclocking cpu I have had since AMD's Athlon 64 days. I was hoping for significantly more as I have seen much higher clocks from the same batch as mine but mine seems to need a massive jump in voltage for anything higher and it's just not worth it.
I've never seen that, but then again I don't use auto settings so maybe somethings overriding it.