I found some posts here stating "the card needs to be in an upright position" to fix the -Vapor Chamber- issue.
If that doesn't work and heat is still high ...
Would water cooling solve that?
-- How much of the problematic heat is from the memory chips? from the GPU chip?
-- Can the usual 'CPU thermal compound' be used on the GPU? Or is that a different compound?
-- Would the memory chips need any additional cooling besides a ( free airflow / open case )?
Note : I have a ( spare / not in current use ) GPU water cooling block handy.