You'd expect HBM or GDDR6 to be used. But this is seemingly LPDDR5 that's being used.
So its still quite unusual. Its like Apple decided to take commodity phone-RAM and just make many parallel channels of it... rather than using high-speed RAM to begin with.
HBM is specifically designed to be soldered near a CPU/GPU as well. For them to be soldering commodity LPDDR6 is kinda weird to me.
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We know it isn't HBM because HBM is 1024-bits at lower clock speeds. Apple is saying they have 512-bits across 8 channels (64-bits per channel), which is near LPDDR5 / DDR kind of numbers.
200GBps is within the realm of 1x HBM channel (1024-bit at low clock speeds), and 400GBps is 2x HBM channels (2048-bit bus at low clock speeds).
So its still quite unusual. Its like Apple decided to take commodity phone-RAM and just make many parallel channels of it... rather than using high-speed RAM to begin with.
HBM is specifically designed to be soldered near a CPU/GPU as well. For them to be soldering commodity LPDDR6 is kinda weird to me.
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We know it isn't HBM because HBM is 1024-bits at lower clock speeds. Apple is saying they have 512-bits across 8 channels (64-bits per channel), which is near LPDDR5 / DDR kind of numbers.
200GBps is within the realm of 1x HBM channel (1024-bit at low clock speeds), and 400GBps is 2x HBM channels (2048-bit bus at low clock speeds).