120 GB/s memory bandwidth. The M4 Max will probably top out at 4x that and the M4 Ultra at 2x that again. The M4 Ultra will be very close to 1TB/s of bandwidth.

120 GB/s memory bandwidth. The M4 Max will probably top out at 4x that and the M4 Ultra at 2x that again. The M4 Ultra will be very close to 1TB/s of bandwidth. That would put the M4 Ultra in line with the 4090. Rumours are that the Mac Studio and Mac Pro will skip M3 and go straight to M4 at WWDC this summer, which would be very interesting. There has also been some talk about an M4 Extreme, but we've heard rumours about the M1 Extreme and M2 Extreme without any of those showing up.