Hi there, I've got the Redmibook Pro 15 by Xiaomi with the Ryzen 7 6800H. There's no need to overclock the Ryzen 7 6800H. There are two reasons - first, because it's got just enough cooling to sustain a Ryzen 7 6800H at stock temperatures and its VRMs (which are also cooled by a separate piece of the heatsink, but it's more like passive cooling, and it's kinda insufficient when you push the TDP higher) at 65W for 10 seconds and then at 54W for 10 minutes, which are the stock PL1 and PL2 TDP limits for Ryzen 7 6800H, and pushing the TDP higher will make the CPU go past the safe 85C temperature (at 54W of sustained CPU-only workload, it hovers at 84C), which will drastically increase the CPU degradation over time with sustained workloads the higher the temperature is.
And the second reason is because overclocking brings very little performance improvement. AMD's Ryzen 4000, 5000 and 6000 laptop APUs were all designed to run at 45-54W, and by increasing the maximum TDP to 60-65W you will only be looking at a small 3% uplift in performance, and that is only if you use all 6 or 8 cores that your laptop has, which is quite uncommon.
Though there are methods from third parties that allow you to tweak the maximum TDP values, like an app called UXTU, it's actually useful to sometimes decrease the TDP with this app to get a much cooler and quieter experience while using the laptop. If you're going to use third party software, you should make sure to limit the CPU temperature to 77-80C while gaming. And overclocking your iGPU will also bring just 3% more performance at best, at the cost of much higher power consumption, less safe temperatures and even damage to the APU, so you should forget about overclocking your Ryzen 7 6800H APU altogether.
Why don't you instead tweak the TDP values and decrease the TDP to around 15W so as to be able to play videogames on battery power instead? You could get around 3 hours of play time at very respectable framerates and settings that way.
