The 5600G had 7 graphics compute units, the 8500G only has 4; if it performs within 10% of the 5600G, the compute units are almost 60% faster than 3 years ago.
They had better be; 5000G chips are based on old GCN Vega stuff, while these are based on the latest RDNA3 architecture. They're also clocked MUCH higher, as AMD focused a lot on clock speeds when developing RDNA2.
In fact, pretty much all of the performance gain going from a 5700 XT to a 6700 XT is based on the latter's higher clock speed, as their specs are very similar otherwise (although a 6700 XT has 12 GB 192bit memory and a heap of cache, whereas the 5700 XT has 8GB 256bit memory that runs a small bit slower, and crucially, way less cache).
