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Why do different BIOS version change CPU temps?

DELTAprime
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I'm hoping someone with a bit of computer engineering knowledge can answer this question. I upgraded my Maximus IX Hero last month to the newest BIOS version, re-entered my overclock and found my 7700k ran about 5c -8c hotter at idle than on the previous BIOS. I've now downgraded back to the older version and my CPU is running cooler again. What is it about a motherboard BIOS that can make the exact same CPU hotten even with the same clocks and voltages entered?

OBSIDIAN: CPU AMD Ryzen 9 3900X | MB ASUS ROG Crosshair VIII Hero Wifi | RAM Corsair Dominator RGB 32gb 3600 | GPU ASUS ROG Strix RTX 2080 Ti OC |

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PSU Corsair HX750 | Cablemod Cables | Monitor Asus PG35VQ | Asus PG279Q | HID Corsair K70 Rapidfire RGB low profile | Corsair Dark Core Pro RGB SE | Xbox One Elite Controller Series 2

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I cannot answer your question but I have similar experience on AMD FX platform. The temps show about 3-4 degrees C hotter in the bios. When I land on desktop and launch HW monitor, it shoots down few degrees.

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