I think it depends on various things like:
- what memory chips they are using e.g. Samsung B-die, Hynix M-die, Hynix A-die, etc.
- how many sticks of RAM e.g. 2 sticks or 4 sticks, and did you buy a single kit or did you buy 2 kits and try to join them together (not recommended).
- whether they are single rank or dual rank.
- what options you have available in your Bios.
First, find out your exact part number for all your memory and check what is written on the memory sticks regarding rated frequency, primary timings and DRAM voltage.
You can use tools like CPU-Z and Thaiphoon Burner to get some more useful information about the RAM. I think corsair also come with different versions printed on the sticks where I have seen v4.31 is usually Samsung B-die and v5.39 is Hynix. Thaiphoon Burner will be able to tell you type of memory chips they use.
You could check the motherboard QVL list and check if you RAM is on there. It might give you a clue what settings to pick in the Bios.
Some RAM have XMP profiles which tell the Bios what settings to use for that RAM overclock profile but my understanding is XMP is more for Intel platform and AMD use DOCP. The DOCP option in Bios may or may not work for you. You will probably have to try various settings until it works or drop down to a lower frequency or relax the timings. Usually you can start by manually inputting your frequency, primary timings and DRAM voltage and see if that works. You may also need to set the SOC voltage and some other Bios settings may be useful depends on your memory and motherboard e.g. Command rate 2T CR can be very beneficial for stability with high memory clocks, or for 4-DIMM configurations.
Another option could be to search forums with your exact Memory part number and motherboard and try to find some suggestions. Or find information based on similar kit, check they are using the same memory chips (Samsung B-die, Hynix M-die, Hynix A-die), same number of Dimms, and same rank e.g. single rank or dual rank.
Once you have successfully booted you might want to run some memory stabillity tests to confirm they are good, some examples:
- HCI Memtest (An instance needs to be opened for each individual thread, covering a total of 90-95% of memory giving the OS a little breathing room.)
- GSAT (google stress app test)
some useful info about memory testing here:
http://www.overclock.net/t/1628751/official-amd-ryzen-ddr4-24-7-memory-stability-thread
Some other resources regarding memory I found useful:
How to overclock RAM and CPU by Robert Hallock
https://www.youtube.com/watch?v=vZgpHTaQ10k
AMD article: Community Update #4: Let's Talk DRAM!
https://community.amd.com/community/gaming/blog/2017/05/25/community-update-4-lets-talk-dram
and this is a good resource for Ryzen in general:
Ryzen Essential Info with link to owners info DB
http://www.overclock.net/t/1625015/ryzen-essential-info-with-link-to-owners-info-db
Edit: this was also a good video
ASUS B350 & X370 Ryzen Overclocking Walkthrough
https://www.youtube.com/watch?v=pBmVf0S4UDs
Something to note is the motherboard will sometimes go through what is know as "memory training". It usually trys 3 attempts to boot with the RAM settings and if it fails it falls back to default 2133Mhz frequency.
