On RTX 4080 Voltage

[WhoDecidedThat]

AD103 in RTX 4080 (above) doesn't go below 935 millivolts. And it idles at 945 millivolts!! How interesting!! This is in stark contrast with Ampere (below; source = 3070 Ti) which went as low as 762 millivolts (V-Sync) or 662 millivolts (Idle).

Any idea what could have changed?

I wonder what consequences this has for those who want to undervolt their 4080s.

 

[Taraquin]

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AD103 in RTX 4080 (above) doesn't go below 935 millivolts. And it idles at 945 millivolts!! How interesting!! This is in stark contrast with Ampere (below; source = 3070 Ti) which went as low as 762 millivolts (V-Sync) or 662 millivolts (Idle).

View attachment 274233


Any idea what could have changed?

I wonder what consequences this has for those who want to undervolt their 4080s.

New arcitecture With 40-series it seems voltagefloor is anywhere from 870-940mv. A 4070 I tested had 910mv as lowest which allowed for a 2680@910mv giving 90-95% of stock perf at 35% less power, not bad. Ampere can run 700mv but get vram downclock to 10GHz. Some Amperecards at high temps can run vram at full speed at 712mv (my 3060ti TUF does that at 65C+), at 45C it does 731, at 51C it does 725mv. Powersavings on Ampere is more impressive, but also perf-drop i higher. Running my 3060ti at 1620@725mv gives me close to 85% of stock perf at about 40% lower consumption.