What are the key differences in the fan blade design between the RX 9070 XT and RX 7900 XT

RX 9070 XT Fan Design:
- The RX 9070 XT, particularly in models like the ASUS Prime series, features Axial-Tech Fans. These fans have a smaller hub, allowing for longer blades, which enhance airflow and dispersion. Additionally, a barrier ring is used to increase downward air pressure, improving cooling efficiency and reducing noise levels[1][3].
- The design also includes 0dB Technology, where fans stop when GPU temperatures are below 55°C, resuming operation when temperatures exceed 60°C. This feature helps maintain silence during less demanding tasks[3].

RX 7900 XT Fan Design:
- The RX 7900 XT models, such as those from PowerColor and ASRock, often feature traditional fan designs with multiple heatpipes for enhanced thermal dissipation. For example, the PowerColor Red Devil model uses a massive triple-slot, triple-fan cooling solution with a direct-contact copper plate for improved thermal performance[4].
- Some RX 7900 XT models, like the ASRock Steel Legend, incorporate V-shaped air vents and cuttings to improve airflow dissipation from the fans[4].

Sapphire NITRO+ RX 9070 XT Fan Design:
- Sapphire's NITRO+ RX 9070 XT series introduces the AeroCurve Fan Blade Design, which reduces air friction, allowing for higher fan RPMs while maintaining low noise levels. This design enhances airflow and static pressure, providing better cooling performance[5][7].

In summary, the RX 9070 XT models, especially those from ASUS and Sapphire, incorporate more advanced fan blade designs with features like Axial-Tech and AeroCurve, which optimize airflow and reduce noise. In contrast, the RX 7900 XT models often rely on traditional fan designs with a focus on robust heatpipe configurations for thermal management.