I've been playing around with the voltage and clocks on my V64 for a while now but I think I've finally found the sweet settings.
I always seemed to have very little luck undervolting the core or overclocking the memory on my card so I had been using the auto undervolt settings (which were 1207mV for P7@1750Mhz, which is the default on the liquid BIOS) and setting the power limit to +20% or so to keep it at about 300W total with the HBM@ 1000MHz/1000mV. Anyway it was getting pretty hot in the room so I figured I would try and adjust some of the settings to keep the power draw down.
Turns out knocking the P7 target down to 1700MHz and dropping the voltage to 1100mV will allow me to actually overclock my memory to 1100Mhz and even with the power slider set to +50% the total consumption is down to ~240W. A quick and dirty timespy before and after yields a marginal performance gain whilst taking 60W less. With the fan speed set to 50%, my sustained temperatures are down from 62C to about 52C which is pretty nice, I have a feeling the 120mm rad gets a bit overwhelmed above 250W or so.
I also guess I had little luck overclocking my memory because having the core bouncing about the 1750MHz point was too much for my chip to handle at the same time as a memory overclock, it would always result in a blackscreen lockup pretty quickly setting the memory about 1000MHz, even at stock 1250mV on the core.
Just confirms my suspicion that memory overclocks have greater fps gains than core clocks, especially if your core is already at about 1650MHz+
