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One possible reason is that an interface in Windows has been used to fix the number of processors (threads) at 20. This facility does not auto-update on a change of CPU and you need to turn it off which should the give you the correct number of threads.
To access this interface press the Windows key + R to bring up a Run box. Type msconfig into the Run box and then press OK. This will take you to the System Configuration screen, select the Boot tab and then press the Advanced options button. See graphic below.
This will take you to the BOOT Advanced Options screen. In the top left of this screen you should find the Number of Processors option is selected and number of processors (threads) set to 20. See graphic below.
To turn this facility off, untick the Number of processors box. This will not change it from 20 immediately. Then click on OK.
This will bring up the System Configuration screen again. See graphic below. Click on Apply first and then OK.
This will then bring up the final screen where you should select the Restart option. See graphic below.
After restarting your system the full 24 threads should be available on your new processor.
