Originally Posted by jempalmer
Sometimes the new heatsink requires that you remove the motherboard to change the baseplate. I had to when installing my Corsair watercooling setup.
This pretty much sums it up. That said, a lot of cases now have a cutout on the back of the case so you can install a cooler without removing the motherboard which is nice.
Using a coolermaster 212 here - has helped a lot to get low temperatures.
To give an idea, I have a Core i5-2500k overclocked to 4.6Ghz.
With case fans set to low - idling at 36C.
With case fans set to low - with Prime95 running CPU package temp is 72c.
One thing I'd be interested to know about if anyone here knows is why the ASUS software reports much lower temps than CPUID hardware monitor, which reports what I suspect are accurate readings. For example when CPUID Hardware Monitor reports 72c, the official ASUS software reports around 45c.