Buildapc

I can’t speak to the mini computer side of things, but I just got my AMD full stack to post the other day and I booted bazzite (only bazzite) on it, so if there’s anything I can help with on that front let me know

To address your questions directly:

• Those parts aren't particularly i) high TDP or ii) large in the case of your GPU so with both of the main considerations for ITX builds being more consideration for 1) cooling performance and/or parts that run cooler and 2) space constraints you should be OK as is. The Cooler Master NP200 (not the V2) is commonly touted as a solid starter ITX case for being easily available, very affordable with good features for the price, and is fairly forgiving for an ITX case not being the most compact. Sites like https://caseend.com/ or the Google sheets linked to the SFFPC subreddit are great resources to check case features, sizes and part compatibility. In terms of layout, it's worth familiarising yourself with cases in sandwich configuration which are more common in SFF than larger form factors. This essentially splits the case into two down the longer length, with one side dedicated to the GPU and the other to the CPU/mobo at one and the PSU at the other. As well as the traditional configuation, some cases also support an inverted layout where you can locate the GPU at the top of the case, and CPU/mobo/PSU below it. In terms of performance, it very much depends on the particular case

• CPU cooling all depends on the CPU in question, and a willingness to tweak (undervolt, turn off boost, etc) if necessary. Space is another consideration, so CPU clearance both in terms of height and overhang i.e. whether the motherboard heatsink and/or RAM could be impacted should also be considered

• I'm very much generalising, but the mid or higher end boards are safer bets if you want to add high end CPU upgrades into the equation. Though the benefits of PCI-E gen 5.0 haven't yet really been realised yet, and looks to need more powerful cooling like gen 4.0 vs earlier generations

• Fans: choice of fans is as important as airflow and the number, both fan support and airflow depends on the exact case. An example is the Phanteks P30, which are considered one of the best fans on the market, but also reflect that in the price! I use some Arctic P12s just as I had them lying around from an old desktop build. See caseend and similar resources for fan support details

• I'm terrible at cable management so am not best placed to answer, but cable length (both too short or too long!) can become an issue in SFF builds. Some builders buy custom cables to suit their exact case and layout, and is certainly an option. I prefer to stick to the cables that come with the PSU mainly due to paranoia admittedly. For PSU size, whilst some ITX cases do support larger form factors like ATX or SFX-L, after going down to a certain case size it just becomes so much easier to work with SFX cases in terms of being able to maneuver parts around or have more space to hide cables. But YMMV on the case in particular!

The SFF discord connected to the sub was pretty helpful for me when building my living room gaming PC, could be worth checking out. I can't speak for Bazzite but I'm using EndeavourOS on mine and love it, tbh it's made me an Arch fan

Fractal Designs Define series comes with good build quality, good sound dampening and dustfilters. Their M-ITX version is large for an M-ITX case though. I have no problem air cooling it with a Ryzen 7600 and an RX 6650 XT in it. https://www.fractal-design.com/products/cases/define/define-7-nano/black-solid/