$1.$ What are the differences between Intel i$3,$ i$5,$ i$7,$ i$9,$ and Xeon?

$2.$ What are the differences between AMD Athlon, Ryzen $3,5,7,9,$ Threadripper and Threadripper PRO?

$3.$ What are the differences between DDR$,$ DDR$2,$ DDR$3$ and DDR$4?$

$4.$ What are the differences between SAS HD$,$ SATA HD and SSD HD$?$

$5.$ What is Acorn RISC Machine architecture?

$6.$ What are the differences between x$86$ architecture and ARM architecture?

$7.$What are the troubles in Intel i$9$ CPU?