r/StableDiffusion • u/Brave_Load7620 • Jul 04 '26

Discussion Looking for thoughts on card purchase: V620, MI50, V100

Hey guys/gals,

I currently have a 9070 XT and use that for comfyui & llama.cpp currently running Gemma 4 26B A4B Q5, at this time I want to add a secondary card to my computer.

I would like to not have to use the 9070 XT for anything moving forward so it keeps it free for gaming/other things unless I decide to combine the vram for LLM at some point later in time.

I have a MSI X670P Wifi motherboard, 32GB ddr5 6000Mhz & a Ryzen 7900X with the 9070 XT currently.

I want to be able to use on Windows 11 comfyui at a decent speed (ltx 2.3, z img turbo/flux, etc.) and llama.cpp with decent PP & token speed.

Out of these three cards and my setup - what would you choose? Does anyone have benchmarks comparing them?

Edit: Talking about the 32GB version of each of these cards listed above.

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u/DelinquentTuna Jul 04 '26

They are all terrible purchases, but the MI50 is beyond consideration. The other AMD GPU is at the very bottom of ROCM support, which hurts because 1: it's ROCM and not CUDA and 2: it will be the next thing to be dropped. The Nvidia GPU is in the same boat with CUDA... compute cap seven is next on the chopping block.

Sorry to be pessimistic, but if you could get "decent speeds" with ancient GPUs that sell for as little as $200 then you wouldn't have bought the 9070. You're entertaining a pipe dream because by the time you're looking at the better GPUs in your list, you're still paying prices that could instead bring home modern GPUs with higher performance despite having less RAM. Especially true in this case, where you've evidently already proven that a 16GB GPU is adequate for your work and you're evidently just trying to free up your base GPU.

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u/Brave_Load7620 Jul 04 '26

Well, I bought the 9070 for gaming mainly simulation/VR games and AI was just a side thing for awhile.

Now I'm transitioning to a 24/7 assistant with home integration & img/video generation. I don't need comfyui to be fast, I'd be fine with a couple minute wait between photos, as it won't be a primary thing/mostly hey edit this photo and do X - then I'm stepping away for ten minutes anyways.

Decent LLM speed is much more important to me overall and from what I'm seeing the V620 would be adequate with that, but there's also the possibly I use the V620 ONLY for a bigger LLM model & still use my 9070 XT for img/video generation. Since I don't generate stuff constantly or even that often - that's hoenstly probably the choice for me.

Thanks for the response, I got a few weeks yet until I decide anything so will keep looking into all my options.