Question Problems with RAM. ASRock b450M pro4

[Kixyyyy]

RAM is causing slow startup times, sometimes not booting at all, sometimes quick as lightining. Sometimes freezes my pc up.

Ryzen 5 3600
Hyperx trident 2666Mhz 2x4Gb
Asrock b450m pro4

 

[jojesa]

How do you know is the RAM?