For this AMD FSR 2 sample application tested under Linux with AMD RDNA 2 architecture specifically, the "massive performance difference" between drivers has been fixed in the application ...

While all eight of the H-series processors are 6nm and use AMD’s Zen 3+ and RDNA 2 architectures for CPU and graphics, respectively, only two of the five U-series processors—the Ryzen 7 6800U ...