GPU starts throttling at 85C(Starts reducing voltage and since one of the boost clock reasons is Vrel, it reduces boost clock) . You can make custom FAN curves using the MSI Dragon Center, however, maximum RPMs are 6000.
I am using stock vBIOS overclocked by MSI afterburner
+135mhz CORE only (click "load full resolution" to see clocks and temps)
+135mhz CORE / +250 Mhz Memory. (click "load full resolution" to see clocks and temps)
You are getting nearly the same results but 10C higher temps.
The problem with overclocking is that you are getting really small % increase in the exchange of high temps and voltage. I gave up overclocking mobile GPUs.