Couldnt possibly disagree more, in fact im already running this same system albeit with a inno3d 4070 ti super in a Midori 5L. A 9800x3D can run without any pbo offset under a AXP90-x47 FC, Im currently running mine on a L9A and only with a -20 offsetPutting a rtx5090 fe inside a U-ITX remains a poor idea for gaming for 2 reasons, at least :
For gaming, aim for the rtx 5080 max inside the U-ITX.
- Poor thermal that will force important power reduction (-30% as it the max)
- With the arrival of DLSS4, rendering résolution would be moré and more 1080p that could lead to cpu bottleneck, especially as you have to reduce the cpu tdp inside the U
the entire point of going console with a 5090 would be to isolate the gpu and cpu intakes. By simply flipping the gpu the riser doesnt block the exhaust, you’d easily be able to run the card at its full 575w.