I have not yet managed to complete the 16 GB ... I return to 4GB 800MHz. The difference is most qu'énorme! With that, everything is faster. 4 * 4GB is a good compromise compared to 2 * 8 (for example), particularly quality / price ratio.
The heat sinks are particularly effective, no need for additional fan.
The design is nice, and fits very well with the rest of my PC.