Just some info to look at the hotspot temps from another perspective; eventhough my GPU is watercooled, when put to work it still has a delta-T of about 30 ~ 35 degrees Celsius between GPU & hotspot.
This is only under load only, when idle or low usage the delta-T is max 5 degrees Celsius.
Because of the fact that my GPU is watercooled, the temps are still well within an acceptable range, with aircooling it could be a little higher of course depending on the quality of the cooling device and the airflow.
Picture below, I tickled the settings in Adrenalin to the max to get some serious power usage on my RX 6700 XT (>
240W). These numbers are recorded with ambient temp 29 degrees Celsius and cooling liquid temp fluctuating around 33 degrees Celsius.
View attachment 355951
As soon as I stop the load, temps return to a few degrees over ambient within about 10 seconds and the delta-T between GPU and hotspot to about 5 degrees Celsius. So there is excellent heat transfer even for the hotspot.
View attachment 355952
So my point is, I know the contact of the sillicon with the cold plate is good in my case, but still the high delta-T occurs. This seems to have another reason.
For example I don't know where these sensors are physically located and how much thermal resistance there is between them induvidually and the cooling solution, but that might have some influence. For all I know, this may vary chip by chip as this occurs on a macro scale.
I'm not saying it can't be the TIM, but repasting is not always or the only solution as far as I'm concerned, you have to keep an open mind.
And yes, everything exceeding the 90 degrees Celsius threshold is a no go in my book, I prefer it much cooler.
To the OP, airflow at the front of the GPU alone is nice, but don't forget a proper airflow on the backside/backplate also. A lot of heat is emitting from there as well. In a small case that could quickly lead to undesired results due to the overcrowded cramp space in shuch a small volumetric area creating a plethora of restrictions. There may be less airflow on the desired places as you expect, despite the overall airflow should be sufficient.