AMD released FidelityFX SDK 2.0 and FSR 4.0.2 a few days ago. FSR4 uses AI acceleration to achieve better image magnification effects, but actual measurement results show that although the image quality has improved, the frame rate has declined. @opinali tested FSR 4 on AMD Radeon RX 9070 XT graphics card using AMD FFX SDK version 2.0.
The test environment is to turn off frame generation and vertical synchronization. The results show that when FSR 4.0.2 is enabled, the frame rate of RX 9070 XT is 276 FPS; while in the same environment, when using FSR 3.1.5, the frame rate can reach 290 FPS.
At the same time, compared with FSR 3, the GPU utilization of FSR 4 has increased by 37%. The reason is that FSR 4 adopts more advanced AI acceleration technology, such as the use of motion vectors and time data. Although these technologies can improve image details, they also consume more computing resources on the GPU, which also leads to a decrease in frame rate.
However, this drop in frame rate is only reflected in a small portion of the rendering workload and will have little impact on the daily gaming experience for the average player.
For competitive gamers who pursue high frame rates, they may need to carefully consider whether to enable FSR 4, but if image quality is more important than frame rate, FSR 4 is undoubtedly a better choice.
