Cool.
Precision Boost 2
Enter the BIOS by restarting the computer and hitting the DEL (Delete) key on your keyboard rapidly as it boots. Might take a few goes if you're not used to it. Be careful in there. Don't accidentally enter values in the wrong place or voltages could spiral for example.
Pic 1 (above): See Advanced CPU Configuration which is highlighted in red? That's what you want to click on to access the Precision Boost options. But before you click that, click A-XMP and set it to Enabled, so that your memory runs at the proper speed. Ignore the rest of the changes to settings in that pic as I was overclocking the RAM a little.
Pic 2 (above): Now you can see the Precision Boost Overdrive option. Ignore what I have it set to and just choose the "Enabled" option (instead of Advanced or the other options).
That's it, now hit escape a couple of times and go to the Settings tab (left of the image, above the OC tab), and find the Save and Exit option. PC will restart and you'll have Precision Boost enabled as well as your memory running at proper speed.
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Wraith Prism Software
Turn the PC off. Make sure the RGB cable from the Prism cooler is plugged into an RGB header on the motherboard (see pic below marked in green, easiest to connect will be the header on the top-right):
Then go to MSI's webpage for the B450 Tomahawk MAX and download Mystic Light 3 -
https://download.msi.com/uti_exe/mb/Mystic_Light_3.zip
Unpack the downloaded folder by right-clicking it and choosing Extract. Then open the 3.0.0.66 folder inside it, and double-click Mystic Light to install. Have a play with it, hopefully it will work for you.