5 ms·GPUs use 4-6 stacks of HBM2 which is 1,840-2,760 GB/s. It's 2x-3x the bandwidth of M1/M2 Ultra.by wmf 3y agoGPUs use 4-6 stacks of HBM2 which is 1,840-2,760 GB/s. It's 2x-3x the bandwidth of M1/M2 Ultra.