I have a feeling Expert is just like this board in terms of TCCD overclocking, the NF4 first gen we all love was purely tuned to clock TCCD and it really does show, this RDX and i bet the Expert is tuned to clock all dimms well with the exception of hynix which seems to have issues. The only issue is that TCCD clocks have come down a little.

Remember 270x10 2.5-3-3- can be faster than 300x9 2.5-4-3- with the right tweaks, all is not lost with either of these new boards from DFI, you just need to overclock in a slightly different way.