Ok, I tried it. Still nothing.
Whichever bios I flash, speeds remain 700/924 :P

I checked the original bios dump and before and after flash dumps using hex editor.
Bios is definitely getting flashed as new dumps after flashing the card are identical to the bios I flashed.
Still for some reason clocks and voltages are not sticking.
I tried flashing it with stock and modified bios of evga, ASUS, Palit and MSI.

Nothing happens to clocks :@