Question Pc doesn't post when switched to advertised ram speed (2666mhz)

Nov 16, 2019
Specs :
Ram : Corsair vengeance LPX 8GB DDR4 2666mhz

Motherboard : TUF H370 pro-gaming (latest bios update)

While going through bios settings I noticed that this whole time the ram has been running on 2400mhz. So I went ahead and switched it to 2666mhz in my XMP profile and after a save and exit the pc won't boot .

The only way I can boot again is if I long press power button, and then prompts to direct to bios settings where I switch it back to 2400mhz and bam it works again.

I have also tried disabling XMP and going auto but that just puts the speed to 2132mhz.

I want to know whether I would ever be able to use the speed that's I'm supposed to be able to. Maybe I haven't done it right to switch it correctly 😢