The root cause is architectural. FSR 4 was designed from the ground up for RDNA 4's dedicated AI hardware, which includes native FP8 matrix acceleration. Back-porting it to RDNA 3 forces the driver to fall back on general-purpose shader instructions (INT8 compute) that are less efficient for neural network workloads, incurring that measurable penalty .
The Adrenalin 26.6.2 driver that enabled FSR 4.1 on RX 7000 cards also triggered stability problems in specific titles.
The most disruptive launch issue was a critical bug in Adrenalin 26.6.2 (released June 22, 2026): it failed to install properly on Windows 10 systems with RX 7000-series and RX 9000-series GPUs. Affected users saw a yellow-bang error (Code 43) in Device Manager, rendering the driver non-functional and Radeon Software unable to launch .
FSR 4.1 is not yet available on RX 6000-series cards, and the wait is longer than expected.
The good news is that the same INT8 model powering FSR 4.1 on RDNA 3 will eventually arrive on RDNA 2, but owners of RX 6000 cards will need to wait until at least early 2027 for an official release.