how much can you undervolt an i7 7500u in a stealth?

Interesting; I haven't noticed that. I did not know about the ring/core voltage, either. I will try decreasing my ring undervolt and increase the core undervolt.

 

Use same values for CPU, cache, Analog IO and System Agent, so if undervolt causes instability you can decrease everything for easier diagnostic/troubleshooting.

 

core/cache can do at least 50mv

analog/sa is +10mv compared to core/cache

igpu at least 45


Undervolted on an i5 7300U

 

I was able to get -80mV on all parts with i5 7300.

 

In my case (i7-7500U) I've managed to go -80 mV on the CPU, going under that threshold gives me an almost instant BSOD.
For GPU I've gone for -60 mV, as I read that GPU should not be undervolted that much (so it's possible I could go lower). Though the ThrottleStop guide says the values for CPU and GPU should be the same... And earlier in this thread someone said that GPU should not be undervolted at all.

 

Undervolting the GPU should be harmless - if you go too low you'll just crash and need to reset.

 

My i7 7500, stable at -90 mV, the difference is noticeable when playing with the core setting CPU intensive games like AC Origins, without it the game would crash due thermal that goes over 90 that bring unstable FPS (stuttering because throttling) in my guess, with that uV value I keep the thermal under 89 and finished the game. On other games like OW, destiny 2 I don’t need uVing.