For an old nvidia it might be too much energy drain.
I was also using the integrated intel for video re-encodes and I got an Arc310 for 80 bucks which is the cheapest you will get a new card with AV1 support.
Is x266 actually taking off? With all the members of AOmedia that control graphics hardware (AMD, Intel, Nvidia) together it feels like mpeg will need to gain a big partner to stay relevant.
Google is pushing av1 because of patents, but 266 is just plain better tech, even if it's harder to encode.
This same shit happened with 265 and vp9, and before that, and before that with vorbis/opus/aac.
They'll come back because it's a standard, and has higher quality.
Maybe this is the one time somehow av1 wins out on patents, but I'm encoding av1 and I'm really not impressed, it's literally just dressed up hevc, maybe a 10% improvement max.
I've seen vvc and it's really flexible, it shifts gears on a dime between high motion and deep detail, which is basically what your brain sees most, while av1 is actually kind of worse than hevc at that to me, it's sluggish at the shifts, even if it is better overall.