Hi BAGZZlash !
After tests, it seems that it is the histeresis threshold (5°c) which is coded in the bios, and not the fan speed decreasing temperatures thresholds.
That means that increasing the 25%->31% temperature threshold from 50° to 55° also leads to an increase of the 31%->25% threshold from 45°->50°.
Which sounds really good ! So you don't have any work to do on this side, 5°c for the histeresis is ok.
Amazing tool this RBE !! Our HD2900 are no more noisy
t h a n k y o u B A G Z Z l a s h ! !