undervolt & underclock - GTX 1080ti Voltage/Frequency curve question

[xeon_fan]

Hi,
As my both WS CPU's bottleneck a bit 1080ti Gaming OC I decided to undervolt and underclock GPU as it does not make sense to overachieve on GPU side.

I got 1900mhz @ .893 V so it's ok I guess (nothing fancy) - now I wanted to go down with the clock (under 1900 mhz) but each time I get something like that on the curve:

it's like 1900 is getting 1200 mV in that case scenario ...

Is it ok?

 

[13thmonkey]

I seriously would not bother, the GPU will be utilising a percentage of it's capacity at a given speed. So you might be running at 60% @2000Mhz, or 100% at 1600Mhz. The effect would be the same from a power consumption point of view. However were anything to happen on screen that needs more computational power, then the first scenario could hit 65%@2000, the second scenario would stutter as it has no where to go.

Cards and CPU's these days are very very conservative on power use, if they don't need the power they don't pull the power, they have a very fine grained approach. It will probably run at a lower frequency anyway, with reduced voltage. It will be a lot better at this than you.

 

[xeon_fan]

Well it make sense and I have already achieved like 5 degree less .... so just leave it 1900mhz @ 893 mV ?

btw what this "spike" in the curve do?

 

[Serinox]

The spike you can see on the end of the voltage curve is normal. I witnessed the same on my 1080ti. However my card never reached this voltage. It will stay on the lowest voltage needed you set for a frequency which is inside it's "working range". 1.2v is way above anywhere a non modded 1080ti can go, so you are fine.

 

[xeon_fan]

Sad you cannot choose two answers as solution :|