You will actually need to reduce voltages. My 960T unlocked runs on 1.2 volts stable at stock speeds with the stock cooler. You could get 3.3GHz at 1.25volts possibly stable without running into high temperatures. I suggest you stay below 55c as more will reduce the CPU's life span. At 3.2GHz with 1.25 volts it should be stable. To overclock much more you will need an after market cooler. I suggest you buy a Cooler Master Hyper 212+
and some ASAA
. You will need to work the thermal past in between the heat pipes and aluminum base good and a very thin layer all the way across.
My setup gets 3.72 GHz at 15.5X multiplier with the FSB at 240 and PCI at 80. I used 240 as my RAM is 1600 which matches up great. My voltages are CPU vid 1.3625, NB vid 1.1250, and another voltage change ill have to get from bios. It can go 16X on the multiplier but temps go a little past 50c and will force me to increase my heat sink fan past level 8. I like it on the quieter setting.
I have the same motherboard also and you will need a lower side mounted fan. The ASRock 970 extreme3's chipset really gets hot even at stock settings.