Recommended GPU

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I can't DM because that's disabled, better to have the discussion here. The RTX will outperform, say an A380 in a few ways, but cost vs. performance might not be there. Additionally, quality vs. performance I would say QuickSync outperforms NVENC, though that gap has been narrowed significantly.

Getting good info on these cards is difficult since benchmarks are not easy to come by. With an A380, which was a $150 card when I bought it, seems the consensus is ~4x 4K transcodes. I doubt you'll find something capable of around ten. So you could hedge your bets in a few ways: find a good deal on the RTX 2000, assume you won't be transcoding that many streams simultaneously (probably true) and go with a money-saving A310 or 380, or you could compare pricing between the RTX and an ARC B580 which has 12 GB VRAM, which is a huge bump from the 6 GB on the A380. I like the ARC cards for a media center and they're pretty aggresively priced, so that makes them attractive.

That said, my personal inkling would be whichever I can get cheaper between the RTX and a B580.

As for the question you asked in your DM: what else would you be running? Well...AI mostly. With an RTX 2000 Ada you'd be positioned fairly well in the AI market. While my A380 is semi-capable (and great for the cost), it can't tap into most of the hardware-accelerated models out there, which NVIDIA cornered the market on early.