How far and safe can I OC non-cooled DDR4 RAM

[Jeff_120]

I have 2 Kingston RAMs
1x 8GB RAM 2133mhz
1x 8GB RAM 2400mhz
Both are ''naked'' meaning no cooling on them
I have an MSI Gaming Plus B450M board so I can OC them, but how far can I OC while staying safe?
Should I OC the 2133mhz bar so it can catch up with the 2400 one?

 

[ron2456]

2133 to 2400 should be okay I guess, but anything above 2400 will not be safe.
Do some stress test after OC to check if its stable or not. Also no need to bump the voltage

 

[Jeff_120]

2133 to 2400 should be okay I guess, but anything above 2400 will not be safe.
Do some stress test after OC to check if its stable or not. Also no need to bump the voltage

Thanks
Btw is there an "auto" OC with msi mobos for ram? I know there is one for gpu and cpu but what about ram?
And for the 2400mhz bar, should I OC it too or it's useless as it will be limited by the slower bar?