I didn't test it with the AIO in place, but with two Phanteks T30 fans as exhaust instead. In that config under GPU benchmarking for ~10 mins, the 4090 runs at

I didn't test it with the AIO in place, but with two Phanteks T30 fans as exhaust instead. In that config under GPU benchmarking for ~10 mins, the 4090 runs at about 70°C for the GPU and 80°C for the VRAM