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As it stands the AMD code has restricted RAM tuning options which means many RAM kits at launch will not be compatible. This is the same for our competitors also.
What we recommend is the following:
If fully populating a system with 4 DIMMs (2DPC), use memory up to a max of 2400MHz.
If using 1DPC (2 DIMMs) ensure they are installed in A2/B2 and use memory up to max of 3200MHz.
The indication I have received from HQ is that AMD has focused all their efforts on CPU performance so far and will release updated code in 1~2 months when we expect improved DDR4 compatibility and performance."
In short if filling all 4 DIMM's set your speed to 2400MHz and work up from there.
If using 2 DIMM's put them in the A2/B2 slots and a max of 3200MHz should be possible.
Samasta lähteestä:
UPDATE: For clarification, the issues are reportedly more prevalent on the lower-end and mainstream Socket AM4 motherboards but even flagship boards have issues with DDR4-3600. Officially, Ryzen supports up to DDR4-3600 but at the moment you may need to run the memory below the rated speed. As such, ASUS recommends users to start at 3200MHz and work your way up from there if you use two memory modules. If you use four DIMMs the issue is more grave, in that case you're recommended to start at 2400MHz.
The issue is not vendor specific and the wording of the ASUS statement indicates the solution will involve a CPU microcode update from AMD so it is a fixable and relatively minor problem with the processor.
AMD Ryzen has issues with high-frequency DDR4, fix expected in 1-2 months (updated)
Eli ongelmaa on, mutta ei niin vakavaa kuin aluksi on annetty ymmärtää.