This might be its schematic.
Investigating if I can install BGA DDR4 chips to get 16GB memory instead of 8GB currently on it....

Thank you for the very good suggestions. Did not know about the Panasonic design guide. This is the first VRM I repaired (I usually repair 230V SMPS) and was not sure about the small ringing on the waveform.
"Quite warm" is indeed not the best description to use will remeber this.I have not measured with a thermometer but I estimated 45 degrees.
You are correct about the efficiency of the older VRMs, nothing seems to be wrong anymore with that VRM. The heat generated by CPU seems to slowly move through the PCB copper layers into the VRM caps and coils that are nearby....

I used these Panasonic FK seriers caps for recapping the VRM Vcore line. Hope they are the right type for the VRM needs.
[url]https://uk.farnell.com/panasonic/eeufk0j152l/cap-1500-f-6-3v-20/dp/1744873[/url]

Plan to replace the remaining two phases high side Mosfets with the higher spec STD86N3LH5 and check if any improvement.https://I used these Panasonic FK se... the remaining

This board had the initial fault in VRM with high side Mosfet from PWM1 (phase 1) getting very hot. It also had the VRM caps quicly heating up in 10-15 seconds after power on.

This board uses mext ICs and Mosfets in VRM:
- ADP3180 PWM controller - in 3 phase mode
- ADP3418 as Modfet drivers
- High side Mosfets STD38NH02L (from ST)
- Low side Mosfets STD90NH02L

Some of the symptoms were very similar with the "Dead Asus P5P800-VM" in this forum.
I had the sawtooth voltage on Vcore too this was probably the cause of the Vcore caps...