From a person who only uses an ipad.
The most, and probably only interesting thing, in my opinion, was the new imac pro (mainly because of the inclusion of a xeon and high end spec) .
Apples also late to the party with quite alot of their new products (such as the homepod, vr, external graphics and making multitasking on ipads better).
The new watch faces were mostly awful looking or pretty useless.
The new ios control panel looks awful.
The "files" application is a weird but welcome move for ios.
The way that external graphics (through thunderbolt) seemed to be locked down to only an apple selected gpu in an apple dock was to be expected.
The fact that they're starting to support vr seemed like they were telling you to either go buy a high end end mac or buy their external gpu.
And the rest didn't gain my attention or memory.
Depending on the version of the cooler you have it just plugs in via sata power or through a 3/4pin PWM fan plug. This can be placed accordingly the CPU tot he CPU header and the GPU onto another chassis fan header on the motherboard.