The maximum memory configuration for the M3 Max MBP was also128GB.
That's my whole point. M3 Max 128GB -> M3 Ultra 512GB. M5 Max 128GB -> M5 Ultra 512GB. But if M5 Max 192GB -> M5 Ultra 768GB, i.e. Ultra having 4x the memory of Max.
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That's my whole point. M3 Max 128GB -> M3 Ultra 512GB. M5 Max 128GB -> M5 Ultra 512GB. But if M5 Max 192GB -> M5 Ultra 768GB, i.e. Ultra having 4x the memory of Max.