If the data in our hands are correct, the most of current FM2/AM3 heatsinks will be incompatible with the next AM4 Socket, due to the mounting holes arranged differently (see the table below).
So, just the heatsinks with the clips will be compatible with the next AM4 Socket, like the new Wraith AMD cooler (our review, in Italian, here).
| Socket | Long Side | Short Side |
| AM2/AM2+/AM3/AM3+/FM1/FM2/FM2+ | 96 mm | 48 mm |
| AM4 | 90 mm | 54 mm |