For our temperature testing, we measure steady-state GPU temperatures under load. A reading under load comes from running A Plague Tale: Requiem for 30 minutes.
We don’t yet have comparisons for thermal performance, but the 5070 FE delivers decent results out of the box, hitting just over 70C on the GPU and 74C on the memory. For reference, I've added in the results of the other 50 series cards – they're not a direct comparison as the power demand various hugely compared to the 5070, but it gives you an idea.