Question Ram Frequency

[Cursed Puppet]

Hello, am using H310M-K Motherboard which supports 2133/2400/2666 Mhz. And I having i3-8100 which supports 2400 mhz and got RAM 2x 8GB 3200mhz. When I first rime launch MB Ram speed was on 2133, I Increased speed without XMP and set to 2400, so I want to ask if it's right way? Or I should turn on XMP? And also in DRAM status it still shows that is on 2133 but in information tab its on 2400 and also when checking in task manager it showes 2400 also.

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[CountMike]

That's what XMP is for, those are presets for best performance and stability.