I'm using the bios with 160/500 in 2D, but I had to increase the voltage to 0,99V, because it had some artifacts in 2d, with 0,94V.
In 3D it is not stable at 750 mhz (watercooled)
725 Mhz is ok, I didn't try anything else.

for memory 1150 is too much, there are some minor artifacts
and I cant set 1125 in RBE, because there is some checksum error.
sor I can run my card at 725/1100, with only bios Volt mod.