Jaz11 wrote:
When looking into load line calibration i have noticed motherboards do it 2 different ways
1: voltage is lower in idle and boosted up under load eg 1.3v idle - 1.37 load
2: voltage is higher and droops under load eg 1.37v idle - drops to 1.3v under load.
Why is this? Can you change this in bios? I have example 2 but would prefer the lower voltage then extra under load...
This is extremely complicated, but having a voltage of 1.3 idle and 1.37v load when on MANUAL (not automatic or adaptive) voltages is completely impossible.
This would imply a NEGATIVE loadline, and loadlines are based on resistance. Resistances can only go down to 0 mOhms (no vdroop). it's not possible with any controller to have a negative resistance. A 0 mOhm loadline will have a flat slope (but with high (possibly dangerous at higher voltages) transient overshoots you MUST use an oscilloscope to pick up), meaning the idle vcore and load vcore will be exactly the same.
Sensors however CAN be affected by resistances, causing the reported voltage value to rise under load at higher loadline calibration levels. How much this rises depends on where the voltage read points are. Even a digital multimeter can show vrise if it is reading from a point affected by resistance.
The maximus XI line has the SIO voltage sensors recalibrated to match the CPU on-die sense, which is the true voltage reading. So you will see a lot more vdroop at lower LLC levels because the real voltage will be reported, and no voltage rise (<16mv) at the highest LLC level (0 mOhm loadline).
Read this by an Asus employee who knows what he's talking about
🙂https://www.overclock.net/forum/27686004-post2664.html
