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NVIDIA

NVIDIA graphic cards support hardware accelerated encoding on Windows and Linux
NVIDIA GPUs since GeForce GTX 600 (2012) have the hardware accelerated video encoder called NVENC. At first it was just supporting H.264/AVC, but H.265/HEVC is also supported since GTX 750 (2015).
The NVENC encoder is well supported in Gyroflow and offers fast video render times on Windows and Linux.
Important! Always make sure you have the latest driver installed from the official NVIDIA Drivers page. As long as your GPU has the hardware encoder, most acceleration issues are solved by installing the latest driver.

Supported graphic cards

Refer to the official Support Matrix at nvidia.com.
Make sure you are checking the correct codec (H.264 or H.265) and video bit-depth.
Read more about NVENC on Wikipedia.

10-bit support

Hardware accelerated encoding of 10-bit videos is supported only by the latest video cards. Refer to the official Support Matrix to check if your GPU supports 10-bit video encoding.

ProRes/DNxHD support

NVIDIA's NVENC supports only H.264 and H.265. No other codec is hardware accelerated on NVIDIA cards.

Maximum supported resolution

8192x8192 is the maximum supported resolution on modern cards, and 4096x4096 on older. Check the Wikipedia article to learn more.