Overclocking Tests
Our regular method of overclocking Ryzen processors is to raise the voltage to 1.3825V - a safe limit for our air cooling - and increase the all-core multiplier in 25MHz steps until the chips cannot complete the Blender test that lasts around eight minutes on the 3800XT.
We achieved an all-core 4.4GHz for the 3900XT and 4.425GHz for the 3800XT. Those figures don't tell you much in isolation, so we put the original 3900X and 3800X back in and overclocked in exactly the same way. The older chips both managed 4.35GHz, indicating there is more frequency headroom in the new process.
There is more of a benefit for 3900XT because while it overclocks to a lower level than 3800XT, there's more of a difference between the OC (4.4GHz) and non-OC (4.051GHz) frequencies.
Handy jumps for both in Cinbench muliti-thread.
Yet oveclocking on all cores alone negates the benefits of a few cores boosting to higher frequencies still. Our approach is not immediately beneficial for gaming.