Since I got my new setup, temps have gone up like crazy and I cannot find the source of the problem. Using Prime95, my 955BE goes as high as 65-70 degrees celcius. This is at standard clock and voltage, which are 3200mHz and ~1.35v.
The cooler I use is: Arctic Freezer 7 Pro and thermal paste: Cooler Master something. Case fans are turned up to medium instead of low and the heatsink seems to be placed correctly.
With my old motherboard (M4A77) and this exact same cooler, temps would stabilize at ~54 degrees at full load.