Did a quick search and did not find anyone post about undervolting their 3090 Ti.

Anyone care to share?

Had good success undervolting - with two different profiles on ftw3 black.


Scenario 1. Low draw games with minimal benefit to mem bandwidth:

725mv @1630mhz core and 625mhz mem (which is 10ghz) = 160w. Undervolted as far as she’ll go- not much power draw benefit by dropping more core speed. There is a voltage / frequency threshold for the memory - anything under the curve throttles the vram to 625mhz - unless you boost lock in px1.

(((((Draw gets really low here - when the vram drops to 625mhz (which is basically idle 2d mode I think) as the voltage : FBVdd (that you’d typically only be able to manually change with classified tool on a kingpin) - drops memory voltage as well as memory controller voltage in 2d mode - and takes about 60w off the total.)))). With normal speed memory - it sits in and around 220w.

Scenario 2. Power savings but still the most performant gpu for anything else mode:

875mv @1995mhz and +999 memory = 280-300w. Needs boost lock in px1 - or vram will throttle to 625mhz - as here again it is below threshold.

Haven't witnessed this mem threshold behaviour in prior ga102’s. For example on my KP - best I can manage is 200w at 725mv (1630mhz -250mem, classified sliders all to the left save nvvdd on auto) - and mem will not run in 2d mode without taking core speed with it (very much not worth the energy savings - TBPD runs 50w though).

Indeed. The quality of the 3090ti silicon is quite good. This one will hit 2160 fairly steady at 1050 - so it’s not a super high clocker compared to some - but it matches volts with my 3090kp at 1995mhz.

I have my FTW3 Ultra undervolted to 2130 MHz @ 1v.

Where can I find an undervolting guide to PX1? I know how to do Afterburner, type in a negative core you want boosted, curve edit drag voltage up to target core speed, +MHz is indicated, click checkmark. PX1 I don't understand, and YouTube is of no help. I would use Afterburner, but I need the custom fan curves of PX1 because the FTW3 I just bought has a defragging HDD on fan #2 that needs to stay above 80% to not make me commit suicide.
 
Paul

Can I set the undervolt in Afterburner, then PX1 will see it, click save in PX1 and then disable Afterburner and it will stick as a PX1 profile?
 
UPDATE
 
Apparently yes. I saved the curve in PX1 and it is working fine.
 
RTX 3090 Ti FTW3, stock "aggressive" fan curve, locked at 2100 core, +500 memory, 0.95v, maintaining 65c at 350 watts.
 
My RTX 3080 Ti XC3 at 100% fans, locked at 1920 core and +500 memory, 0.862v maintained 75c at 350 watts, and was much, muCH, MUCH LOUDER.
 
Paul