We did run vLLM on the 3090s — measured ~3 tok/s slower on generation for our single-to-few-user pattern, plus less flexibility on quant and slower startup (actual minutes vs single digit seconds). We may do more with it again in the future - there isn't unlimited time for us to tinker, I'm sharing our journey (so far) and reasoning.

It's the right call for concurrent batched serving (barrkel's point downthread is spot on), but for how we use it llama.cpp is still better for us.

The Spark/GX10 route is a genuinely different bet though and appreciate you sharing your numbers. At the time (several months ago) the consensus was that GX10s were for fine-tuning only, and the numbers were severely low.

..and the card was never about replacing a Claude Max sub. For the workloads we actually bought it for, it's giving us 140-200 tok/s (which matters).