@ChaliceofTears , welcome to the Community.
@ChaliceofTears wrote:
is my AMD Ryzen 5 3600 cpu compatible with my HP 8643 motherboard
Here is the Motherboard Specifications page: https://support.hp.com/us-en/product/hp-pavilion-gaming-desktop-pc-tg01-0000a/37874510/document/c064...
If you look at the section titled "Processor upgrade information" you will find a list of compatible processors. These processors have been fully tested to assure they are compatible. The Ryzen 5 3600 is not on the list. This means that it will most likely not work.
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I am not an HP Employee!!
Intelligence is God given. Wisdom is the sum of our mistakes!!