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AMD Strix Halo, to be launched in early 2025, will have a 256-bit memory interface for LPDDR5x of 8 or 8.5 GHz, so it will match M1 Pro. However, Strix Halo, w

AMD Strix Halo, to be launched in early 2025, will have a 256-bit memory interface for LPDDR5x of 8 or 8.5 GHz, so it will match M1 Pro. However, Strix Halo, which has a much bigger GPU, is designed for a maximum power consumption for CPU+GPU of 55 W or more (up to 120 W), while Lunar Lake is designed for 17 W, which explains the choices for the memory interfaces.

Dylan16807 2y ago
That's good. And better than match, that's 30% faster, at least until the M4 Pro launches with a RAM frequency upgrade. On the other hand, I do think it's fair to compare to the Max too, and it loses by a lot to that 512 bit bus.
kvemkon 2y ago
> LPDDR5x of 8 or 8.5 GHz Not 8000 or 8500 MT/s and thus the frequency is halved?
- adrian_b 2y ago
  Sorry, I meant the frequency of the transfers, not that of some synchronization signal, so 8000 or 8500 MT/s, as you say. However that should have been obvious, because there will be no LPDDR5x of 16000 MT/s. That throughput might be reached in the future, but a different memory standard will be needed, perhaps a derivative of the MRDIMMs that are beginning to be used in servers (with multiplexed ranks). MHz and MT/s is really the same unit. What differs is the quantity that is measured, e.g. the frequency of oscillations and the frequency of transfers. I do not agree with the method of giving multiple names to a unit of measurement in order to suggest what kind of quantity has been measured. The number of different quantities that can be measured with the same unit is very large. If the method of giving multiple unit names had been applied consistently, there would have been a huge number of unit names. I believe that the right way is to use a unique unit name, but to always specify separately what kind of quantity had been measured, because having only a numeric value and the unit is never sufficient information, without having also which quantity has been measured.

Dylan16807 2y ago

That's good. And better than match, that's 30% faster, at least until the M4 Pro launches with a RAM frequency upgrade. On the other hand, I do think it's fair to compare to the Max too, and it loses by a lot to that 512 bit bus.

kvemkon 2y ago

> LPDDR5x of 8 or 8.5 GHz Not 8000 or 8500 MT/s and thus the frequency is halved?

adrian_b 2y ago
Sorry, I meant the frequency of the transfers, not that of some synchronization signal, so 8000 or 8500 MT/s, as you say. However that should have been obvious, because there will be no LPDDR5x of 16000 MT/s. That throughput might be reached in the future, but a different memory standard will be needed, perhaps a derivative of the MRDIMMs that are beginning to be used in servers (with multiplexed ranks). MHz and MT/s is really the same unit. What differs is the quantity that is measured, e.g. the frequency of oscillations and the frequency of transfers. I do not agree with the method of giving multiple names to a unit of measurement in order to suggest what kind of quantity has been measured. The number of different quantities that can be measured with the same unit is very large. If the method of giving multiple unit names had been applied consistently, there would have been a huge number of unit names. I believe that the right way is to use a unique unit name, but to always specify separately what kind of quantity had been measured, because having only a numeric value and the unit is never sufficient information, without having also which quantity has been measured.