400 GB/s is insane memory bandwidth. I think a m5.24xlarge for instance has something around 250 GB/s (hard to find exact number). Curious if anyone knows more details about how this compares.
I think Anandtech showed a M1 P-core could max out 50+GB/s on it's own, so 8 P-cores alone likely can use 400GB/s. With both the CPU+GPU, they'd be sharing the BW. A 3060/6700XT have ~360-384 GB/s, so game benchmarks should be interesting to see at high res.
Additionally, do the 24-core GPU and 32/64 GB RAM variants of the M1 Max all have 4 128-bit memory controllers enabled? The slide seems to just say 400GB/s (Not "up to"), so probably all Max variants will have this BW available.
The value is in the power efficiency here (N5P?+), and if you can afford a $3k+ laptop.
