Is it possible to travel from Son La to Dien Bien Phu by motorbike?

I have a question that is very similar to "Hanoi to Mai Chau by motorbike" & "Mai Chau to Son La by motorbike" but for Son La to Dien Bien Phu.

A friend and I plan to go from Son La to Dien Bien Phu by motorbike (around 150km). Each of us will drive a Honda Win 110cc. As for the other related questions I have only found a couple of articles mentioning this route so I'd just like to get feedback from more travellers.

The QL6 national road followed by the Quốc lộ 279 national road seem to be the simplest way to do this journey, however I wonder if there is more convenient route (e.g. less traffic, or better scenery)?

© OpenStreetMap contributors

Resources

http://hanoieasyrider.com/vietnam-motorcycle-tours/motorcycle-tours-hanoi-mai-chau-son-la-dien-bien-phu-sa-pa-hanoi-8-days/s25

http://www.fodors.com/community/asia/vietnam-motorcycle-itinerary-feedback-pleeease.cfm

I ended up taking the QL6 national road followed by the Quốc lộ 279 national road.

It took around 5h in total.

Other resources

I bumped into a Spanish blog having an article about the Son La to Dien Bien Phu route. The nice part is, they shared the GPS tracking for the journey at the bottom of the article. You can also directly find this "Son La to Dien Bien Phu" GPS track on Wikiloc.