Basically you will have 20+ all be the same along your flatline, then you should have an optimized curve from lowest point to your max flatline. You can start to work on left of the flatline, just make sure you record voltage for your max somewhere then same process of next tick on graph find what is the lowest voltage it will run at top speed then move from there. Once you have found your comfortable max GPU clock and flatlined everything to the right of the graph. I proceed to undervolt GPU by similar to what you stated found a high gpu clock that the system seems to settle on and tweak undervoltage from there for GPU. What I found was after undervolting CPU till I was happy, and finding good turbo all clocks that give me comfortable temp. Should allow the GPU to run at a higher clock more frequently. Now, supposedly after some updates, I found myself locked out from editing 'processor graphics voltage offset' and 'core voltage offset'. The caveat here is because the CPU and GPU cooler are shared and thermal headroom gained is somewhat lost by the tendencies to run at higher clock speed, the solution I found was somewhat limit cpu clock so it doesn't eat up all that thermal headroom you made. Undervolting has been my go to tool on Dell with 7700hq to keep the temperatures under control. So what I found if say you undervolt cpu and it generates less heat but will also run at a higher clock a greater percentage of the time due to thermal headroom. I know I'm a little late to this thread but I've done a lot of testing with undervolting etc.
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