Locked at 40x multi with i7-6700k and Maximus VIII Hero?

[visionviper]

I'm working on overclocking a new build but for some reason I seem to be locked at a 40x multiplier. I've disabled (at least so I think) all speedstep and any power reduction features. TPU is set to "Keep Current Settings" and CPU core ratio is set to "Sync All Cores" followed by a ratio limit of 47. Throwing the system under load does nothing and everything stays at 40,

I'm obviously missing something obvious here but I'm just not seeing it.