The chip is like 8 years old now and the mother board is...okNo compatibility issues what so ever.
Nvidia works just as well with both intel and AMD.
AMD CPU with AMD GPU have some additional perks especially if your running low spec gpu and an APU.
But otherwise those things are meaningless and dont benefit 99.9% of customers.
Whats happening with your i5?
The 2550K is still a fairly good chip especially in single threaded performance. Even better if you OC it a bit.
Youll definitely benefit a bit by going with a new chip but thats mostly gonna be benefits from more cores for multithreaded applications and updated chipset (ie more PCIE lanes).
an i5 2550K with a gtx 970 is still fairly decent, especially for 1080p gaming.
DD3 1600--16GB Ram
Idk i just cant run assassins creed odyssey on it without significant delays and like..medium setting only getting 20-24 fps.