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Are you really sure about that? I thought LPDDR is all about low power consumption - running at half the frequency but making up for it by twice the bus width,
by daneel_w 4y ago
Are you really sure about that? I thought LPDDR is all about low power consumption - running at half the frequency but making up for it by twice the bus width, ending up at same performance but with an emphasis on the LOW POWER part of its name.
Add.: or maybe I got it the wrong way around; smaller bus width but same performance due often being clocked faster. Either way I cannot find anything suggesting LPDDR offers practically faster performance on memory-bound operations than the DDR equivalent, but I'd love to see some tech details and numbers explaining how it works.
- wmf 4y agoIn Apple's case, it's the same width (M1/2) or much wider (Pro/Max/Ultra) and also clocked faster (6400 vs. 4800).
- pclmulqdq 4y agoLPDDR used to be about power consumption. It is not any more. DDR uses a lot of power for I/O and SERDES links to maintain a modular form factor, and LPDDR uses a lot less power by having worse signal integrity and lower swings. They run the memory cells and the I/O faster, and as of LPDDR4 it is now significantly faster than the DDR memory products available.