Guide a beginner to setup a silent Water Cooling system

[Abel]

you may be able to run completely passive with those components.

I guess I could!

OK selection.
Maybe not the most silent, but good overall compromise in performance/silence.

What do you think would be quieter?

Doesn't matter how they are/are not divided/where are placed in loop. Choose rads however they are simplier to mount in your case. As your hardware is rather cool as it is, no need for something more then 120x3. Maybe even 120x2 will suffice. For fans i advise scythe gentle typhoons.

I see. The most important is to do what you can with the case you have.

No need to. Mostly thrown out money for bling purposes.

So, basically CPU and GPU are the only relevant component to water cool.

Cheaper, more compact. Harder/longer to fill/bleed.
Not much difference in flow/temps, so take smaller size, eg. 3/8"ID / 5/8"OD, will be easier to route tubing in your rather compact case. Pair or so of 90° fittings won't restrict flow too much. Just don't build using only such fittings.

I read somewhere it's a good idea to fit tubes into smaller fittings. Do you know something about it? I guess I'll go with 3/8;5/8.

Best/simpliest/cheapest would be distilled water. Put somewhere in loop some silver kill coil or add pair of drops of some biocide to prevent algae growth and you should be fine.

I see. Distilled water & additive. What do you think about complete coolants like Feser One?

I've the MCP350. Runs pretty much silent if you cushion it properly. Mine sits on acoustic foam.

Did you try this product to reduce noise/vibration?

Thanks all.