If anyone in this thread had watched the linked video or even read a summary, they ought to be at least talking about the DIGITS announcement.
128GB of VRAM for $3000.
Slow? Yes. It isn't meant to compete with the datacenter chips, it's just a way to stop the embarrassment of being beaten at HPC workstations by apple, but it does the job.
More tokens/sec on the dual 5090, but way bigger model on the M4.
Plus the dual 5090 might trip your breakers.