Rumors on AMDs upcoming Carrizo APUs have surfaced. The Carrizo series should succeed Kaveri in 2015. The APU should be able to support both DDR3 and DDR4 memory according to a leaked slide. APUs for laptops will also get integrated IO connectivity. With Carrizo AMD will transfer from Steamroller CPU cores towards Excavator-cores.

The Excavator-cores will get the same extensions that Intel's haswell already have like AVX2, bmi2, movbe en rdrand.  Interesting to see is that Carrizo will still be baked on a 28nm fabrication node. The GPU part of the APU will be based on Volcanic islands GCN 2.0 just like Kaveri. As stated the memory controller will be able to support both DDR3 and DDR4 memory. With the soldered SoC versions for laptops the APUs will get an integrated FCH that will provide IO with two SATA 6Gbit ports, four USB 3.0 ports and eight USB 2.0 ports. On desktops the Carrizo-chips will find thay way to FM2+ sockets. The internal FCH will then be disabled allowing a Southbridge chip to gain more sata ports etc.

It isn't clear if motherboard / desktop based Carrizo APUs also will support DDR4, but it would be highly unlikely. Interesting to see is that the number of PCI Express lanes has been reduced from 24 towards 16.