Question about Sapphire AMD RADEON RX 7900 XT MBA

At the moment it looks like only the 7900 XTX MBA is affected, the 7900 XT MBA is not (MBA = Reference Design).

With my 7900 XT, the T-junction is usually between 80-90, which is absolutely feasible for the chip. With undervolting you can bring the T-junction to max 80 and the GPU temp to approx. 61, with the corresponding fan curve.

So it's not a thermal twit.