Overclock the memory as much as you can before it crashes, you get invalid shares, or your mining performance starts dropping due to memory controller error correction; and use the voltage/frequency curve in Afterburner to drop the GPU core voltage way, way down.  Assuming that you are paying for your electricity, you will be way more profitable adjusting your frequency/voltage curve completely flat so that it always runs at min voltage (or very close to it), and then raise the core frequency up as high as you can go before it crashes due to the low voltage.  Look at your Eff/Watt (if using NB miner) or enter your electricity cost in Nicehash miner's settings and enable "display net profit" and see how much you net (if you are using Phoenix miner or something else).  Adjust as necessary until you reach your peak net profit or peak eff/watt.  It will probably take a week of tweaking before you find something you are happy with.  And then, after 2 weeks, you will probably find some other adjustment to make.  At least that is how it worked for me.
 
The core should be barely breaking a sweat.  If your core is running hot, you are doing it wrong.  If you want to make money, you want to be running at minimum voltage and making a minimum amount of heat.  The memory performance is way more important than the core performance.
 
This is what my GTX 1080 is mining at:

 
When I said "set max voltage here", I meant that I set max voltage at that point (750 mV).  I wouldn't recommend the same to you since I don't have your card, I was just illustrating how it is done and illustrating what I was talking about above.  You will need to experiment.
 

 
I'm not sure if this the proper forum section for this discussion.  There used to be a mining forum section, but it is now gone.  This probably belongs in the crunching forum section.  I will ask a mod.

What ty said.

NiceHash is a greedy beast and will fry your gpu if you let it. Voltage down.... way... way... down

When under load you will see a dotted horizontal line appear on the frequency/voltage graph. Where that dotted horizontal line intersects the curve is where the current core boost is operating. What you have in your picture does not show it's current limit, you just clicked a point. You can click any point and nothing will change just by clicking the point. You have to click the point and move the point.

To set a voltage limit, you have to make the curve flat from that point all the way to right. If the curve is flat, it won't jump up to a higher voltage. If it isn't flat, it can jump up to a higher voltage. In your screenshot, you don't have any voltage limit because you haven't flattened the curve at any point.
 
For example, I would try something like this for mining:


Invalid shares: it will say in the mining console windows. What algorithm are you primarily mining? What miner are you primarily using? Look at the name of the miner in the title of the console window. For instance, my NB Miner console window periodically gives an updated summary. Right now it says Accept: 784, Reject: 6, Invalid: 0. Rejects (Stales) happen due to stale shares on the pool and cannot be completely avoided regardless of how fast your internet connection is. Someone else in the pool will sometimes find a solution before you. Invalids are what you never want to happen. An invalid share indicates a mathematical error which indicates a hardware error/instability.
 

^^ My video card is power modded, so the wattage measured is not correct, and the eff/watt is not accurate, but it is still useful for the purposes of comparison.  I make changes until the eff/watt is highest, and/or current profitability in Nicehash GUI is highest.

I am using NB Miner on my PC and one of my laptops due to NB Miner having significantly less stales for some reason compared to Phoenix miner. It seems that the Phoenix miner starts mining higher difficulty stuff (which has a higher payout), but I keep underperforming the pool with Phoenix miner and get lots of stales (around 25% stales) which reduce profit to the point that it is not an effective compromise. My other laptop, on the other hand, must have the right GPU with enough performance and efficiency which slots well into whatever pool Phoenix miner chooses for it, that I get good profitability in Phoenix miner with that laptop, with very few stales (less than 1%).  If I increase my power consumption and performance, I can get Phoenix miner to have less stales on my problematic PC and laptop, due to less underperformance in that pool, but then my profitability power-use-wise tanks.  So, I had to watch things and make these decisions based on what I observed.  You will have to do a lot of playing around and learning. Keep an eye on your profitability above all else.
 
If you are paying for your electricity (most people are), mining is all about efficiency.  You want to find the best performance at the least amount of power use.  Typically the core will be underclocked and undervolted way, way down.  Every overclocker knows that voltage/power use doesn't scale with performance.  Overclockers overclock for the thrill regardless of efficiency.  To the contrary, you want to find where the GPU is most efficient, and you will find that at the bottom end of the scale.

where do you guys mine?

Using kryptex i am getting around 53mh/s at 89 power limit in MSI Afterburner with +150 MemOC and +50 Core OC Temps average around 68-72C fan set to 70%