jlp209

Phoenix864
I do also get some random downclocking, even though temps are under 40c, and my power is not maxed.

That's GPU Boost 3.0 for you. My experience with the 1080 FTW Hybrid and my current Classified has been interesting. My Hybrid would downclock down to 2012mhz when gaming, when it wasn't black screening, from a max OC of 2050mhz. Likely hit voltage or power limit. My Classified max stable is 2088mhz and stays at 2088mhz when gaming and 3dmark. Drops to 2076mhz during Heaven runs. I don't know if it has something to do with the power phases or higher power draw of the Classified, but it was weird to me that the Hybrid would downclock more than the Classified. Regardless, that's impressive for the reference Hybrid card. You got a winner. 

Phoenix864
I'm not the kind of person to spend hours tinkering with a OC. I just like to how high I can get before instability. I tried the OC scanner a while ago, hoping to get a good, easy OC. But after letting it run for 30min or so there was no change. Let it run for 1h or so. Next time I checked in, my computer was frozen. Hard power down, restart. Come back to desktop. I disabled the auto start of XOC, but it still starts automatically. Within seconds of it loading my screen locks up again. Had to do a hard restart. Once at the desktop I had to open task manager and kill XOC before it could lock up my computer again. Never used the OC scanner since. My last overclocking session got me stable at 2150mhz, 150 on core and 500 on memory. Good enough for me. I will post some benchmark results later, if anyone else has a similar OC and wants to compare. In short, don't use the OC scanner.

Sajin
Curve is best. You can lock your voltage in the curve editor. 

Phoenix864
Great, I will use the curve. Is one curve better then the other?
Thanks for all the helpful responses.

Phoenix864

nautics889

Phoenix864
Great, I will use the curve. Is one curve better then the other?
Thanks for all the helpful responses.

Using the Manual custom curve option is the best i believe on precision ocx because you can change each point. or you can you the basic curve editor that moves the whole curve up with whatever point you pick on the graph. i use MSI afterburner for custom Curves because its a little more easier IMO to modify and easily pinpoint what Clock you're aiming for on each voltage point. Hope all i said made sense. 

So, if my max stable offset is 150 (175 seems to crash in-game), what would you recommend for a curve? My two best options for offsets are 140/150 core and 400/500 memory. What would be good to keep clock stability while mantling total in-game stability? Lowering the voltage too much while sustain high offsets will crash, so I have lower the offset very often. When I am done, it ends up looking like the stranded curve, so I end up not using it.
Thanks for the advice.    

Phoenix864
Volts are right on. You could push an extra 50mhz on the top volts using the voltage curve? I have the voltage slider maxed and I sometimes see my volts coming up to 1.93v. The rest of my day is busy, so I many not be able to test until tomorrow. I will do a voltage curve with the top 3 voltage adding an extra 50mhz, and everything else looking like the stranded 150/500 curve. A benchmark run of Valley, Firestrike, Time Spy, and some gaming should be enough to test for stability. Just checking, artifacting/locking up cannot cause damage to the card, right? Just checking, as this is my first build and I am extra careful with my stuff.
Thanks. 

Phoenix864
Well, the voltage curve does not even go over 1.62v, so it probably uses the same offset from there up. I did not notice any higher temps after maxing the voltage, but I am under water. I will try adding 50 on the top voltages and see if it is stable. Any artifacting/freezing up that happens won't damage the GPU, right? Just checking, as I am very (too) careful with my hardware.
Thanks for all the helpful responses.