AlmightyDoorman

The grapheneOS team has stated repeatedly that the fairphone does not meet the requirements for GrapheneOS, they are currently working with a hardware partner to bring GrapheneOS to a (supposedly) new device. This is most likely not fairphone because

1. Fairphone is not selling worldwide, the annoucement mentioned a worldwide partner
2. Fairphone does not mean the Hardware rwquirements and (arguably more importantly because it is harder to fix) the software requirements. They do not have timely enough upgrades.

So there are infinite prime numbers, there exists only one even prime number, the odds of an prime number beeing odd is 100% ((∞-1)/∞)=100%) 2 is an prime number, therefore 2 is odd and is divisble by itself aka 2. Q.e.d.

One of the advantages of CachyOS ist the compilation with the x86-64-v3, x86-64-v4 and Zen4 instruction set. If your cpu does not support any of these sets your theoretical performance gains will be smaller since you do not get the advantage of these tailored compilations. The other things Cachy does like increased swappiness etc. should still work. Check the wiki to see if your cpu supports these sets.