Well, I submitted my score to Firestrike Extreme thread and 1095/1706 was absolute max, no matter how many times I tried it crashed. This one doesn't crash but shows 967/1500 frequency. Would a custom bios fix this?
Sadly, that is the GPU lottery. My previous Titan would reach 1200Mhz on stock volts but both of my new ones need 1.212V to reach 1170Mhz. A custom BIOS helps but I would seriously only do this if you know the risks and are water cooled. For gaming, it isn't worth it but it is good for benching. I can sit both my Titans at 1250Mhz with 1.25V and the clocks stay at that and do not throttle back.