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6400 MHz * 64 bit = 51.2 GBps. Apple's laptops memory bandwidth varies between 100-400 GBps. Regardless, I'd want Apple to have two additional LPDDR5 slots. Th
by vardump 2y ago
6400 MHz * 64 bit = 51.2 GBps. Apple's laptops memory bandwidth varies between 100-400 GBps.
Regardless, I'd want Apple to have two additional LPDDR5 slots. The system could swap there or have a tiered memory.
- Dylan16807 2y agoWhere did you get 64 bits though? That's a single stick, and normal devices use two sticks in parallel. They are in the range of 100GB/s.
- vardump 2y agoSure, although we were talking about $10. And again as a reminder, we agree that Apple's RAM pricing is ridiculous.
- Dylan16807 2y agoWe were talking about $10 for Apple to buy raw RAM chips. I showed that a company can buy those chips, put them on boards, package them, ship them in tiny quantities, market them, and support them for a total cost of $20. How much do you think those things cost? They all need to be subtracted from the $20, and also Apple can probably get a better wholesale deal than the brand I was looking at. I'm not saying $10 is definitely right, but I think it's a pretty good guess.
- vardump 2y agoI'm not sure what they cost to Apple (can they use standard parts?), but I'm also pretty sure other laptops don't have up to 400 GBps memory bandwidth like Apple's Max laptop lineup. So there's something they're doing pretty differently. That said 8->16 GB should be more like $50, not $200.
- Dylan16807 2y agoThey're getting more bandwidth by having more chips in parallel. It makes their CPUs more expensive but it doesn't affect the price per gigabyte of memory at all. They do use LPDDR5, which was harder for me to find a price on, but so do lots of other laptops, and I don't know if it's more or less expensive than DDR5.