Decimator

That is because your processor supports DDR4 memory only upto 2400MHz, so the system automatically reduces the ram speed to a speed compatible with your processor. Upgrading the processor will help! But there will be no noticeable difference at higher speeds because 2400 MHz is fast enough. Hope I could help! Check supported ram type at Intel

As I've learnt, one can use higher frequency ram on a motherboard with lower compatibility with the only downside that the ram will run at the frequency of the motherboard. But what about the processor? 4th gen core i3 supports only upto 1600 MHz. But all the good Kingston ram available in my country is mostly 1866 Mhz. Can I use 8 gb 1866 MHz ram with a processor that supports only upto 1600 MHz?