AMD RDNA 3  Architechure VS AMD RDNA 2 Architechure 

COMPUTE UNITS

Both architechtures has Compute Units(CU).

Raytracing

Both architechtures has Raytracing, but RDNA 3 has 2nd Gen Raytracing.

AMD INFINITY CACHE

Both architechtures has Infinity Cache, but RDNA 3 has 2nd Gen AMD Infinity Cache.

AI ACCELERATION

Only RDNA 3 has AI Acceleration.

DISPLAY ENGINE

Only RDNA 3 has AMD  Radiance Display Engine.

CHIPLET DESIGN

Only RDNA 3 has Chiplet Design.

PERFORMANCE-PER-WATT

RDNA 3 features 50% greater Performance-per-watt in comparison with RDNA 2.