This is a update to my previous build but felt enough changed I should create a new build for it. I could've built two or three air cooled pc's in the time it takes to take this apart and put it back together.

9900k delidded/lapped die/direct die cooling @ 5.2ghz
RTX 3090 XC3 Ultra (Kingpin bios @ 500w) @+150core/+650mem

Temps @ 20c ambient

Cpu idle 24c/load 60c
Gpu idle 24c/ load 45c

I modified the upper portion of the O11D XL to fit a 420x45mm rad. I poured over the dimensions of the case and knew it could work just had to remove a few things. But as it stands now the cooling loop consists of a 420x45, 360x60, 360x30, D5 pump, Magnitude cpu block with flat cold plate, 3090 block and backplate. Fittings are all nickel but a mix of EK stuff I had on hand and Alphacool for the brass tubing.

In total there's 13 fans and a little over a liter of coolant, which is EK's cloud white. I've been using the cloud white for over a year now with changes every 6mn with no issues of color fallout or buildup in my previous blocks. I can see on some of the fittings there's a little film from it but nothing like the horror stories of people running early primo chill opaque fluids.

I sourced stainless steel hardware for all the mobo and fan screws to match the build colors as well.

After having done soft tubing, PETG, then glass I can honestly say aside from soft tubing brass tubing is very easy to work with especially with pre bent tubes. The only piece of advice I would give is to apply a bevel edge on the ends of any pieces you cut. I went through a handful of torn orings trying to get the tubes to fit correctly. That along with a safe food grade oil to lube the tubing and orings when assembling will help you out immensely. Just be sure to flush the system afterwards to get any oil residue out.