Hey - I'll think about putting together a build log... I was a little self-conscious about hijacking Petricor's thread too much anyway. I'll try to summarize the high points here - all in all, this build is not easy at all - so go in expecting lots of issues.-PLEASE @Vaderator , teach us your ways.. do you have a build thread for this "Petricor-inspired build" please make a build thread, as I (and others) would LOVE to see a list of parts and what else we would need to make a build like this more feasible or possible for ourselves, please! Also what an amazing build, bravo! I look forward to seeing updates on it!
First, some parts recommendations:
Motherboard: Asus ROG B550i Link
Why? it has a temp sensor header which you definitely want to control the fan speed as it can sound like a jet engine and modern CPUs are expected to spike very quickly. A water temp sensor gives a much smoother fan ramp up. Also, the layout is super clean and it has 2 free M.2 slots.
Radiator: Corsair XG5 Link
Why? It is made by Hardware Labs who has arguably the best performance slim radiators, and it has slightly slimmer dimensions than the alphacool nexxxos v2 (L x W x H: 177 x 144 x 30 mm) vs XG5 (170mm x 140mm x 30mm). Every mm counts.
Power Supply: Supermicro 800w (Petricor Mod)
I just couldn't get Gury's 600w power supply to not temp out while gaming - even with mounting a waterblock to it. I and now petricor have had the same issue with the 800w psu, but it can be managed in that psu. Gury's is difficult to disassemble and requires airflow to cool and the heatsinks are difficult to reach, whereas the supermicro has a heatsink that can be leveraged to transfer thermals to the surface of the PSU, which I ended up watercool with the Corsair NVME block. I think the PSU is probably the biggest problem for a layperson to address in this build. One note is you don't need to tacho spoof the 800w supermicro - it will run with the noctua 40x10 pwm signal. I would probably recommend just going bricked and using a corsair 750w sfx as an external psu with JHack's M2426 and doing a 12V style build.
Here's a shot of the Supermicro's heatsink - I just added thermal paste between the heatsink and enclosure and replaced a section of the psu enclosure with copper Link - not sold anymore but perfect fit for max conductivity.
yes, the external paste is ugly, but it has solved the problem for good.
One other recommendation:
Use no-drip quick disconnects to allow for adding an external radiator. I know, this is SFF and we are going for smallest in the s4M. But, if this is your main pc, you can achieve silence and extreme cooling performance with just an 240mm external rad (I augmented with an external ddlt reservoir and pump to help move the water through the additional radiator(s). With the quick disconnects, draining the loop is easy and you can still bypass the external rad for portability by just connecting the two ends together. I'll post a picture to show what I mean.
Oh, and when you inevitably strip all of the threads in your S4M's threaded holes, this kit did the trick: Thread Repair Kit. Just clip off any excess in the springs you don't need.
Here's the quick disconnects (I used cheap alphacool ones, but koolance is supposedly the best)