Some mbs will get Turbo multipliers fixed with updated/downgraded ME9.x FW versions.
Latest F4 bios has the 9.0.30.1482 and can be upgraded to latest ME 9.1 1.5MB v9.1.40.1000 or user choice sticking in same range of the 9.0, with the ME 9.0 1.5MB v9.0.31.1487
cpu mCodes may also have impact on OC features besides Intel Turbo specs.
EDIT: Latest 306C3 is 28.
MMtool or HEX editor can change the desired mcode to whatever version you want.
Flashing the mod should be only with Q-Flash.
Before you procede, the latest bios has the mcodes 12 and 19 for the 306C3, if you block/rename/delete the mcupdate_genuineintel.dll in windows sys (it loads mcode 27) the OS will use the bios mcodes and not the Windows mcode. See how it goes.
If you want to try the mod with old mcodes 06/07, at YOUR OWN RISK, here’s the file:
b85hd32F4_oldMcode.rar (2.8 MB)
All mods are a risky operation, DO NOT engage if this your main system and you don’t have any skills to recover the mainboard bios if anything fails.