Bonjour, Les socket AM4 sont-il rétrocompatible avec les processeur AM3+ ?
Need to post your answer in English since this is a English Only AMD Forum.
No, you can't install a AM3+ CPU on a AM4 Socket. It is not compatible.
Here is an answer from Tom's Hardware: AM3+ CPU in AM4 Board - [Solved] - CPUs - Tom's Hardware
BEST ANSWER
No Ryzen CPUs only work in a AM4 socket because of the pin count difference.
Also a AM3+ socket only supports DDR3 RAM while the Ryzen CPU requires DDR4 RAM.
Socket AM4
1331 pins (Socket)
Socket AM3
941 pins (Socket)
938 pins (CPU)
Socket AM3+
942 pins (Socket)
938 pins (Socket AM3 CPU)
940 pins (Bulldozer Based CPU)