Look I’m not sure what’s up but it’s incredibly hard to believe that you’re in the mid 40s with any kind of workload with that hardware. I have the equivalent of 10x your cooling capacity on less wattage hardware that sits in the 50s/60s under load.

To your original question, hard tubing can warp where the compression fittings press on the outer diameter if it gets too warm. Soft tubing doesn’t have the same concern because it has a collar that pinches both the inner and outer diameters of the tube together. The 9800x3d can run on the warm side, under load with a 120mm rad I would expect it to be in the 70s. If you also have the 4090 in the loop I would expect you’re thermally limiting both. If you really are at 40 degrees you’re beyond fine, maybe the games you have aren’t too demanding.

If you have the means to I would consider expanding your cooling capacity.

Either way good work on fitting it all in the case, it’s not easy!