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.