I am currently running at +105 core and +530 memory voltage and power maxed with the FTW ACX 3.0 standard cooling setup.. I know if somehow there was an unlocked voltage, I could easily get 150 600 possibly. Both will run either one set but not both and not without error after maybe 20 min of hard gaming like Project Cars at 8k resolution High and ultra settings. Unbelievably, it runs any daytime track full race at 35 fps solid with slighting dipping to 30 fps. It's quite realistic as well as playable. and feels more sim like with a good wheel. Anywho Here is my time spy score that verifies my clock speed which does usually maintain 2114 mhz and higher. This timespy score reflects 2,126 mhz and the 1,385 mhz memory which is 11,080 mhz effectively.
 
Guess I cant share the link and screenshot file size exceeds the dinky 500KB file size limit.... Oh well dbLIVEdb is my 3d Mark name anyone who needs proof of the speed this card is capable of.
 

Got mine to +100 GPU and +500 memory, but backed it down to +75 GPU and keeping it at +500 memory. Running cool with MSI Afterburner at no more than 75C in games like Rainbow Six Seige, ARMA 3, Aces High 3, Need for Speed.
 
Antec 1200 V3 Tower Gaming Case
Antec 850w PSU
ASUS ROS Maximus VII  Motherboard
i7 4790k clocked to 4.6 GHZ
Corsair H80i V2 Water cooling
16g Gskill Trident X PC2400 Ram
EVGA GTX 1080 SC Video Card
Samsung EVO 850 500g SSD
Hitatchi 2T 7200rpm HDD
Dell S2716DG 1440p/ 144hz Gaming Monitor (w/Gsync)