According to Intel
https://newsroom.intel.com/wp-content/uploads/sites/11/2018/01/microcode-update-guidance.pdf We should not apply this BIOS update as it may introduce instability ... But they say that we should apply updates as recommended by vendors.
If anyone at EVGA could give us some advice here it would be appreciated. I'm sure we all understand that EVGA is doing an excellent job here, in dealing with errors made upstream. (In other words, let's keep showing EVGA some love because this mess is not their fault)
While many others have confirmed it since, it was myself who discovered that power monitoring was causing stuttering in games. However, even with power monitoring disabled, some (much lesser) stuttering is still present. And, while Intel mostly refer to the issues with these processors as being the sporadic reboots and longer reboot times, they have also referred to general instability. Since the minor stuttering (and we are talking in the region of 0.2ms difference in frametimes for over 99.9% of the frames, so many people don't even notice them) are present in older drivers, this suggests that the stuttering may in fact be triggered by the new microcode and/or windows updates.
Accordingly, I will be downgrading the BIOS to the pre-spectre patches and see how I go. I've been performing extensive tests so it will take me some time to return with results.