4 ms·

Wild guess but if the base chip has 3 channels and the higher binned chip has 4 channels: 3x6GB = 18GB 3x12GB = 36GB 3x32GB = 96GB 4x12GB = 48GB 4x16GB = 6

• jxy 3y ago
  But the bandwidth goes like, 100 GB/s, 150 GB/s, 300 GB/s, 400 GB/s. Given either CPU or GPU alone can't saturate bandwidth (assuming M3 the same as M1 and M2), perhaps the memory controller or the chip layout is to blame.
  • stetrain 3y ago
    Right, the two M3 Max SKUs being discussed above are the ones with 300GB/s and 400GB/s memory bandwidth. That sounds like 3 memory controllers vs 4 memory controllers, likely due to chip binning. TSMC's 3nm processes supposedly still has relatively low yields.