How efficient are the PSU in these chassis at low load, around 100 W or less? I ask because I think the 80+ specification lowest measuring point is at 20% load, so it does not really say how efficient the PSU is below this level.
SC743T-665B at around 100W loading, efficiency is about 85% and SC743TQ-865B-SQ at around 100W loading, efficiency is about 80%