Do you have a specific guide on how to set OC?
It is much easier with Windows since you can watch memory errors in HWinfo, but you can watch for GPU errors and stability in Linux and change the memory OC depend on this.
Mattthev Yes for best Mod Bios OC Windows is better but HiveOS is not bad at all.
GPU error can be found in GUI so it is possible to modify OC to find the weak spot of the GPU and find the best OC settings.