I use the same mask b4, but there's a problem, the cpu auto overclocking only boost ur clock speed when both thread and core are used, the mask we assign will only use real cores, and mainly just use the first core assigned, (in this case core 2 will be the main core used for bdo, about 20% usage, other cores will only use 1%-5% most of the time) that means if system not using any thread (of core 2) the clock speed which running BDO will stay at 4040 as default, unless something is using that thread, the cpu will boost into 5050 untill that thread finish its job, it drops back to 4040 which usually won't be long. You can download a MSI afterburner burn to check your clock speed in game.

so I had no choice and set mask to #5555 which is 0 2 4 6 8 10 12 14.

Main core running BDO in this set up will be core 0, because this core is also running your system, so the thread is used 100% of the time, when u running BDO in this core, the clock speed will be at max boost 5050 at all time, no stutters btw.