You probably mean the 7k series which introduced the DDR5 on AMD and popularized the 6000 value, there is some true at the very beggining, meaning, lots of people who purchased the memory kit outside the QVL had serious issues to get even 6000. But EXPO certified kits worked pretty well from the get go. My G.Skill was easy to set.
If you mean the 9k Ryzen series, they can really do much better than 6000, not sure about the gains as I pull my numbers from user posting benchmarks on Youtube.
In conclusion, stability comes from several factors, not just the rated speed/mts.
There are folks who get lucky with the IMC and will get 6400 on 7k Ryzen series but gains are actually low'ish. This is why 6000 was popularized as the sweet spot.
Don't forget CAS Latency plays a good deal, and if you put 4 sticks you'll get less chances to attain higher values like 6000, as you overburden the IMC. (IMC = Integrated Memory Controller)
Then there are other options that can increase stability and decrease boot times, forcing the memory to train every boot. I use Memory Context Restore set to Disabled, 20secs is not that much and I'm crash free since I've set it that way.
Recommendations:
Always make sure you get a kit from QVL and is EXPO certified.
Good Luck
The Englishman
