im using corsair vengeance rgb pro 3000 mhz ram, my cpu is a ryzen 5 2600 overclocked to 4.2 ghz 1.4v stable, motherboard is a b450 tomahawk. first question is the ram is rated at cas latency 15, but it wont go lower than 16, i overclocked the ram to 3200 mhz and i had it down to 15, then i tried to overclock the ram to 3400 mhz which wasnt stable even with higher voltage. then i set the ram back to 3200 mhz and tried cas 15 again but i cant get it out of cas 16. also whats weird is in the bios it says its set to cas 15, but its actually at cas 16, any suggestions?