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You should be able to enable all cores via the mobo BIOS options. Depending on what O/S you are using there may be other options. Win 7-8 has a known core parking issue which can be corrected with a Windows hot fix. (See below). Win10 adjusts the active cores based on the Power Plan that you select. To enable all cores in Win10 you need to use the Performance Power Plan.
This second Windows hotfix is to prevent the PC from going into the C6 standby mode which also causes core parking issues. This second hotfix can not be removed but it's unlikely anyone would desire to remove it anyway unless the C6 standby power option is important to them.