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I bought and installed the Thermalright contact frame -- IT DOES WONDERS!! Big difference even if it only shaves off 6-12 deg (this depends on how much I undervolt). The added thermal headroom allows me to tame the mighty 13900K just a little bit more. Also, I do see that the heat build-up as more steady than sudden spikes. Thus stability and performance is improved. CR23 now at 40,712 -- https://ibb.co/j4t6M9Y
Hey, I am running a 13900k, 90 Degrees Celsius max, around 38k points in Cinebench. Have a Roq Strix Z690 Mainboard and did undervolting with the load line calibration. LLC is 4, DC_LL 0.98, AC_LL 0.18 (check how low you can go) and MCE Disabled.
Looking good, how are temps?
When using a negative offset, this also affects idle voltage. So when you start to get BSOD's at idle, you know you've reached the limit.
Continue what you're doing and see how much of an offset it will let you go.
I don't have the 13900k but hitting 100c with an offset could be showing your coolers weakness, you could check the water block is mounted properly.
What thermal paste did you use?
If you used the pre applied thermal paste, using a better thermal paste such as thermal grizzly kryonaut will make a significant difference.