Picked up a trick with power limited or temperature (cooling) limited Pascal cards (my power limited EVGA GTX 1070 SC and more recently a temperature limited little Zotac GTX 1060 I've been undervolting and overclocking for someone) which might work for Turing as well if anyone wants to try. Did it through OC Scanner on Afterburner 4.6.0.14315 BETA 12 (29-01-2019).
As Agnes already said, don't touch the voltage. But for this method - lower the Power Limit to 90% and set fan RPM manually to the maximum you're going to want them for 24/7. Then start OC Scanner.
OC Scanner will then recommend an undervolt/overclock better suited for the card, possibly with surprising results. When the scan is complete, do not apply it. Start up Heaven (for example) in windowed mode so you can have Afterburner and the OC Scanner curve window on top of it. Let the card get as hot as it's going to get*. Two runs of Heaven should do it. Then do the following:
* This is so that when you do actually apply later on, the recommended curve won't change as much as if you apply it with drastically different temps.
In OC Scanner curve window, select a voltage/frequency point in the curve of slightly lesser voltage than stock max voltage. For GTX 1060/1070, max stock voltage was 1.05v I think, so I chose 0.983v and 1.0v respectively. Once you've highlighted a point by clicking it, hit L on keyboard to lock it to that. Now go to Afterburner and increase Power Limit to 105% (or more if you want, doesn't matter). Only then hit apply in Afterburner to apply the recommended curve. You can then also change the fan profile to 1:1 or thereabouts.
Now watch the benchmark for a while. Is it sticking to the voltage and frequency you chose? Does Power usage stay below the limit you set (105% or more) even when it spikes? If it's not doing it, you need to choose a point with slightly less voltage. If it's fine, continue:
Lower all the points to the right of it, doesn't matter how much lower, just lower than your chosen point. Then hit L on keyboard again, to unlock. And apply in Afterburner again, and you'll see all the points to the right smoothed out. Now you've set a max voltage that is also unlocked to allow the card to use lower frequencies and less voltages when there's no need for much power.
What happens this way is that not only can OC Scanner recommend a higher frequency at less voltage, but the card will be stable once in games because you've increased the Power Limit for some headroom, afterwards. YMMV with each card. The better the card's power design and implementation, and the better its cooling, the less this will probably apply to it.
Note: in Afterburner 4.6.0 Beta, the Profile "lock" icon must be unlocked, if you wish Afterburner to apply your profile every startup.
