I first set it up with a Ryzen 5 3600 and Radeon HD 6750, running Ubuntu 20.04 LTS, because I thought I didn’t really need that much processing power. After un-blacklisting the driver for such an old GPU, I discovered I was using upwards of 80% CPU and dropping frames while streaming at 1440p, so I decided to upgrade.
Then, I tried a Ryzen 7 5700g with integrated Vega 8. First, I needed to upgrade to Ubuntu 21.10 for such a new GPU, and then OBS Studio was randomly crashing while switching between scenes. Also, hardware video encoding wasn’t working well, so it was still taking upwards of 80% CPU while streaming at 1440p. And the video outputs were finicky, sending windows to the wrong screen on power up. Random crashing is unusable, so I switched to Windows.
With Windows 11 on the Ryzen 7 5700g, the hardware video encoding works well, so the same scenes are taking less than 50% CPU while streaming at 4K (2160p) and not dropping any frames. Now I can do other things on the stream.
I used OBS when I was on Linux and it worked exactly as I wanted it to, but I’ll concede that I 1) wasn’t gaming and b) was using software encoding.