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In addition to what others said about idling in windows instead of the BIOS, did you check your CPU fan curve? The ASRock B450 itx has a very configurable fan curve for all the motherboard headers, you can ask the fan to spin up if you would like it to idle lower. That should be a plenty powerful heatsink for your CPU.Let's see some pics of your build too!
In addition to what others said about idling in windows instead of the BIOS, did you check your CPU fan curve? The ASRock B450 itx has a very configurable fan curve for all the motherboard headers, you can ask the fan to spin up if you would like it to idle lower. That should be a plenty powerful heatsink for your CPU.
Let's see some pics of your build too!