Have you noticed any trends yet Kaapstad?
I've noticed that my 980Ti's are of the lowest ASIC % but of the highest volts (custom BIOS), and certainly not the highest max boost clock.
I think later I'll put the original BIOS back on the cards and record what happens. Before I flashed them I noticed that although they are "identical" cards they had different max VDDC which did affect their clocks a small amount.
It is a little to early for treads to start standing out but there are hints there. We are starting to see the things that we would expect like Higher ASIC is better for boost, high temps are bad and some evidence that high ASIC needs less voltage for the same clocks.
One thing I will be following is GPUs from the same family and how the size of the active silicon effecting ASIC. For example the TitanXs as a group seem to have a lower ASIC than GTX 980 Ti's as a group and 290Xs again seem to be slightly lower than 290Ps as a group. Could it be that GPUs with bigger cores do on average have slightly lower ASICs than GPUs with smaller cores within the same family. At the moment it is too difficult to come to any conclusions but the more results we get the clearer things will become.