Question / Help Vega 64 encoder vs gtx 1080 encoder

[ScaryRage]

Hey,
I want to ask if someone knows if it makes a diffrence if I stream with a Vega64 encoder compared to a gtx 1080 encoder?
All I know is that the 1080 is using NVENC but i dont have any experience with vega graphic cards. Do they perform like the nvenc encoder? Or even better?
Because currently i can buy either a 1080 or a Vega 64 for the exact same price. So I want to decide with which one i get depens on thebetter Streaming quality streaming with my GPU. Also do I lose more or less GPU usage with the Vega? I saw streaming with NVENC only takes like 7% gpu usage. Does the Vega64 also just take that tiny bit?
Im streaming with 8.000Bitrate btw.

 

[koala]

The amd encoder is inferior to nvenc, especially for Pascal chipset (gtx 10x0) and above (rtx). it is also consuming GPU resources if active, while nvenc doesn't consume GPU resources, because it is a dedicated circuit on the gpu. The video quality isn't as great for amd as it is for nvenc. You see this by looking at the "indistinguishable" kind of quality you can use for recording: With nvenc, you really cannot see any artifacts and cannot tell if you have a lossless original or the nvenc-encoded video. With amd, you always see a small bit of grain, regardless how high you set bitrate or quality parameters.

tl;dr:
About streaming: Nvenc is about the same quality as x264 with the veryfast preset. The Amd encoder is not reaching the quality of veryfast.

A comparison by video might be handy: https://obsproject.com/forum/threads/comparison-of-x264-nvenc-quicksync-vce.57358/page-3#post-252221 (also see the first post of that thread)

 

[Zidakuh]

Qualitywise, both NVENC and VCE will look almost the same. You'd hardly notice a difference unless you search frame-by-frame.
As for GPU usage, all encoding done on the GPU is done through a dedicated chip, and should theoretically not hurt performance. However, make sure to not go above 90% GPU usage overall, or OBS won't have enough power to compose the scene.