So, I am a tech guy and likes to fly (in sims) so, I was wondering what physical hardware powers all the 737NG's avionics and related systems (PFD, MFD, EICAS, GPWS etc). Is there an answer to this?
This wouldn't fit as a comment but doesn't get to the processor level of your question. The 737NG/Max has a large number of avionics systems as shown by Airframer. Most of these have processors, some have multiple. In which of these are you interested?