Originally Posted by davidm71
Thanks for all the replies. Sorry to get back you late. Wasn’t getting notifications there were replies. Anyhow I soon realized that grafting a Z390 bios onto Z270 is not possible and would never work. So gave up on that and stuck with just modding the Z270-WS stock ver 701 bios using the Easy Coffee Lake mod tool at Win-Raid. Got it working nice except for example if I set 1.325v I get 1.280v being reported or less according to a CPU-Z. Got Speedstep, EIST, and C-States turned on though so I guess the voltage can fluctuate.
At first I played with DC load line values going as high as 50 to see the effect and then reset it back down after a reboot. Didnt know at the time that literally 1.6 value is the max. Asus bios engineers should have been more clear in their descriptions. Thank god I got extended warranty on the 9700k but it seems stable.
Anyhow my board has two different ways it calculates vid values. First one is through Asus multi core enhancement setting. Disabling that sets the cpu to use Intel standard settings. I didn’t notice much difference. Going to have to use a voltmeter I guess to make sure voltages are accurate. Not sure how else to get the voltages close to its actual setting.
DC Loadline is irrelevant and does absolutely nothing as far as the VRM is concerned.
It's used for power measurements only, nothing more.
DC Loadline only affects CPU Package Power (VID * Amps), and VID reported to the operating system by the CPU. It's not used for operating voltages at all.
DC Loadline affects the "Boosted" (AC Loadline) VID by "Vdrooping" the loadline by the value of DC Loadline mOhms * Amps (Current).
Setting a DC loadline of 62.49 vs 0.01 does nothing as far as operating voltages are concerned.
Operating voltages are controlled by AC loadline (when NOT On manual voltages; on manual voltages AC loadline is ignored also).
CPU pre-programmed default VID is biased upwards by AC Loadline in mOhms (1.6 mOhms is max spec for 8 core CPU's), and is boosted up to a MAXIMUM Of the CPU's max VID (1.520v). It is boosted up differently at idle than at load, and also depends on the type of load as well. It's not a clear formula either. I used to think that very high values of AC Loadline would destroy the motherboard, but it "seems" like the CPU VID (and thus the voltage sent to the VRM) can NOT exceed 1.52v regardless of the value of AC Loadline, and only with offset capability (SVID) can the VID exceed 1.52v.
This voltage is then sent to the VRM as "target voltage" (which again will change depending on type of load or idle).
Then the "Loadline calibration" will then affect this target voltage (that's why if you are using 1.6 mOhms AC Loadline with auto voltages, you should keep LLC at Standard or Normal).
DC Loadline affects the VID *AFTER* the VRM receives the voltage signal (that was boosted by AC Loadline). Not before.
But that's why if DC Loadline= VRM Loadline (both are in mOhms), the CPU VID will be 100% accurate to your actual cpu voltage (if no offsets are used). VRM Loadline=loadline calibration (LLC).