Overvolting SA isn't possible. Negative loadlines do not exist.Solved my problem! For XMPII of the Royal 4000CL17 2x16GB kit, I need 1.37 IO voltage set in BIOS to be stable and the board overvolts up to 1.408v according to HWiNFO. Luckily it's also good for 4400CL18. Also set in BIOS is 1.375v SA, 1.35v vCore LLC7, 1.45v vDIMM, 52x multi, 49 cache, RTL INIT 71, Offsets 16-15, and all other RTL\IOL settings auto.
Passed Karhu for 14 hours. 0707 BIOS with default tXP and PPD. Maybe 10850K's have worse IMC's and is why such high vccio is needed.
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Voltage increase at load is caused by power plane impedance on the Super I/O, the exact same thing that causes Vcore to be higher at load than idle at higher LLC levels (and the SA draws way way WAY fewer amps than core/vcore). So the reading is inaccurate.
You set 1.37, you get 1.37. Try probing it with a multimeter directly on the VCCSA controller chip.