All the information I could find from external sources (assumptions).
-The case cannot be removed with fans, which may lead to a problem with cooling when a graphics card is added. It has enough space.
-Mainboard is relatively good Asus 570 f gaming, but "only" 2x NVMe places, furthermore "only" wifi 5.
-Only 3200 mhz, but that's ok. No brand known.
-NVMe seem to be Samsung https://www.digitec.ch/de/s1/product/samsung-pm9a1-1024-gb-ssd-14662551. If true super. (980 pro oem)
-Graphics card is an Asus Strix ROG 3090, atm about 2500- if available and you ignore the lunatic Ricardo deals that go up to 3k.
-Thor 850W PSU, if true would be great.
-Normal built-in graphics card on this model (horizontal).
-Apparently there's a good keyboard and mouse to go with it. including from here https://www.amazon.com/Desktop-GeForce-Hot-Swap-Professional-GA35DX-XB999/dp/B096VN5V7X . If this is true, https://www.digitec.ch/de/s1/product/asus-rog-chakram-core-kabelgebunden-maus-13916866
and https://www.digitec.ch/de/s1/product/asus-rog-strix-scope-ch-kabelgebunden-tastatur-11769841 for free. It's declared that way on various sites, but Digitec may have a special version.
If you can use all components:
570 CHF CPU
280 CHF Mainboard
150 CHF Ram
2600 CHF Graphics card
191 Keyboard
104 Mouse
330 SSD
230 PSU
250 Case incl fan
150 Cooling system
Chassis, case and RAM prices accepted - 4855 chf.
The first components I would replace would be the case (I find it ugly) and the RAM. Mainboard, CPU, graphics card, SSD, power supply (if no second GPU) are rock solid.
But that ultimately means the price-performance ratio, at least to the graphics card prices, is good enough to improve individual components, even if you can't use everything.
Even if the case and the RAM are replaced, one is still within the 4.8k, then simply with an attractive case and 128 MB Fury 3600 mhz, for example.
I ordered the computer today, I will make an update to help potential buyers.
Of course I would correct myself, should this be necessary.