alt Hacker NewsYou can still buy used 3090 cards on ebay. 5 of them will give you 120GB of memory and will blow away any mac in terms of performance on LLM workloads. They have gone up in price lately and are now about $1100 each, but at one point they were $700-800 each.
I don't see how 5x 3090's is a better option than an M3 Ultra Mac studio.
The mac will just work for models as large as 100B, can go higher with quantized models. And power draw will be 1/5th as much as the 3090 setup.
You can certainly daisy chain several 3090's together but it doesn't work seamlessly.