The heatsink block looks similar to the 620 and the mounting procedure is the same on both so installation is very easy.
Testing was done with the following test setup
Intel Core i5 2500K 3,3GHz
Patriot 4GB DDR3
Crucial 64GB SSD
Ambient temperature during testing was 23 celsius (~75F). For load temperatures we ran the 32M SuperPi benchmark while idle temperatures were taken while idling in Windows without anything else running in the background.
Stock Speed, 3,3GHz:
At stock speeds the 920 outperforms the 620 without any issues, remember that all the coolers are running at low RPM in this test. The Noctua performs very well though and keeps up with the 620 without any issues.
By boosting the cpu and its vCore we increase the load on the cooler and as we can see the temperatures go up a notch but nothing horrible. Fans are at this stage running around 3000RPM.