ITE (IT8689E) Sensor with Socket Sense Enabled VS Renesas (RAA229131) Readings.

[JAEMzWOLF]

On the z790 Master X, you have the option to turn on "socket sense" in the bios (they have a different name for it, but that's the colloquial term), which should give virtually any sensor reading software much closer to accurate readings of cpu voltages. On top of this, Gigabyte's BIOS also provides HWInfo with the ability to get information direct from the Renesas controller.

So, my question is - which one is considered more accurate - the ITE with sockets sense or the Renesas controller (which I would assume has its own 'socket sense').


I suppose it academic - they disagree by only ~30mv for idle/idle-ish time and about ~9mv for constant loads (ITE being higher than Renesas but those amounts).

 

[Martin]

I'm not sure how exactly Socket sense works, but I think that just changes where the Vcore is measured - internally in CPU or socket.
Generally, the VRM (Renesas) is more accurate but in this case for Vcore, the socket sense might give more precise results.

 

[JAEMzWOLF]

Thanks for the fast reply - now, stop hanging around in here and go enjoy your holiday!


PS - I would ask gigabyte, but the area of their support site for tech questions gets you delayed, useless replies.

 

[Martin]

Holidays still far away for me...
I'll ask them directly. How's the option called in the BIOS?

 

[JAEMzWOLF]

That would great!!! Much appreciated!!!

Attached is an image of the setting in bios!!!

 

[Martin]

Confirmed by GIGABYTE: the "Direct Sense" option uses the Vcore DIE sense pin directly from CPU. This is available only on higher-end models due to higher implementation cost.

 

[JAEMzWOLF]

Thank you so much for that confirmation!

So, would that (ITE, with direct sense) be more accurate or roughly as accurate as the Renesas controller's reporting?

Here are some comparisons with about 8 hours of Y Cruncher SFT and12 hours of idle:

load voltages (ITE vs Renesas):
min 1.200v vs 1.190v (Renesas is -0.010)
averages 1.200v vs 1.192v (Renesas is -0.008)
max 1.224v vs 1.269v (Renesas is +0.045)

idles/idle load voltages (ITE vs Renesas):
min 0.744 vs 0.739 (Renesas is -0.005)
averages 1.092 vs 1.118 (Renesas is +0.026)
max 1.344 vs 1.351 (Renesas is +0.007)

 

[Martin]

It should be very close. VRM Vcore is measured on the VRM side and DIE sense on CPU side, so factors like Vdroop can play a role.
Also note that the precision of sensors can be different - for the ITE IT8689E it's 12 mV and for the Renesas RAA229131 it's 1 mV.

 

[JAEMzWOLF]

so ITE is arguable more accurate, but that 12mv stepping, so to speak, kind of makes it less so. I guess it depends on when it moves up or down 12mv, or rather, how close it needs to be before jumping up or down