Just creating an account to post this, since I also posted my new build on /r/sffpc. In short, the 3080 FE works great as long as you install additional spacers on the GPU riser. Below is just a copy and paste of my /r/sffpc post. Hope it helps!
Specs:
• Case: Dan A4 v4.1
• CPU: Ryzen 5600x
• CPU cooler: Noctua NH-L9a with J-HACK duct
• GPU: 3080 FE
• Mobo: Gigabyte B550i
• RAM: 16 GB Corsair Vengeance LPX 3600
• Storage: 1 TB Sabrent Rocket NVME
• PSU: Corsair SF600 Platinum with stock cables
• Case fans: 1xNF-A9x14 chromax, 1xNF-A9 chromax (both exhaust)
• Monitor: Alienware AW3420DW
I haven't seen many air-cooled-only DAN A4 builds here with the 3080 FE, so I wanted to give back to this community that helped me so much with my build. This was my first build in ~15 years and I’m upgrading from a Razer Blade 14 (970m).
1. Build was fun, but the DAN A4 manual was really lacking in detail. I'm left with a whole bag of screws that I have no idea what they're for.
2. The fan installation below the mobo was a pain. You have to install the mobo first, as it won’t fit with the fan. The PSU connector also gets in the way, so you have to force it in place. I derped and ended up scratching the inside a bit.
3. The mobo needed to be updated to the latest BIOS to run the Ryzen 5600x.
4. CPU temps are very high at idle (40-50°C). Supposedly, high idle temps are normal for Ryzen. Even with the silent fan curve in the BIOS, the fans were almost always on. I adjusted it further to only kick in once the temps hit 60°C, so now my build is essentially silent. If anyone has any tips on lowering CPU temps, please let me know!
5. At the stock configuration, the GPU runs VERY hot and loud. When running Heaven and Time Spy, the GPU was hitting 86°C and fans were about 58 dB (measured from ~1 foot away). Core clock throttled to 1710 MHz.
6. To resolve this problem, I added the extra mobo standoffs that came with the case to the GPU riser (idea from u/Maeiourk). The extra space allows the flow-through fan to exhaust hot air out, causes no alignment issues, and drastically reduces temps and noise. At stock with the mobo standoffs, max temps and noise were 80°C and 58 dB in Heaven and Time Spy at 320W.
7. After adding standoffs and adjusting voltage/core clock to 825 mv/1850 MHz, my max temps and noise were 77°C and 50 dB in Heaven and Time Spy at 290W. Heaven score was 4,586. Time Spy scores were 7,910 (CPU), 17,430 (GPU), and 14,764 (3DM).
8. I was too lazy to flip my PSU and redo my cables, so I didn't bother. Another user mentioned this caused instability anyway.
Overall, the build was a fun experience and the overall quieter system is awesome. I haven't had a chance to actually play any games yet, but hopefully soon!