so for those noctua 'fans' out there,since the fan is moving such a low volume,you should probably seal everything you can on the path between fans and cpu cooler(careful around power stage to keep air flowing there a bit maybe),and that means mainly:space under board,space under cooler,space around those 2 aluminium rails(mainly below,big holes),i have 4590t(also does not reboot well,with v6 bios,thanks for the mod btw!)
i have similar/same machine(lanner was busy:) )
i think(early testing) it is making massive difference on silent mode,since it is not pulling air through the gaps
i also tried updating microcode in bios,but i did it wrong,or it did not work (you don't actually need bios update for microcode update),but still locked on reboot..no clue why it freezes