1x 3090 would be faster than the mac, cheaper than the mac, and run on a normal residential circuit. How many breakers would you need for a cluster of 20 macs running at full throttle to match the perf of OP's build?
A single 3090 won’t even fit the model. OP is talking about running a 405B model, it needs close to 200gb of memory just to open it which is why we’re talking about mac studio and it’s 192gb unified memory.
This is exactly like when the AMD fanboys got a burr up their ass about the “$50k Mac Pro” with 2tb of memory… when you could the same thing with a threadripper with 256gb of memory for $5k, and it’s just as fast in Cinebench!
