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I think some of this can be guessed from the SoC codenames https://en.wikipedia.org/wiki/List_of_Apple_codenames https://en.wikipedia.org/wiki/List_of_Apple_co
by cehrlich 5y ago
I think some of this can be guessed from the SoC codenames
https://en.wikipedia.org/wiki/List_of_Apple_codenames https://en.wikipedia.org/wiki/List_of_Apple_codenames
M1 Max is Jade C-Die => 64GB
M1 Ultra is Jade 2C-Die => 128GB
There is a still unreleased SoC called Jade 4C-Die =>256GB
So I think that's the most we'll see this generation, unless they somehow add (much slower) slotted RAM
If they were to double the max RAM on M2 Pro/Max (Rhodes Chop / Rhodes 1C), which doesn't seem unreasonable, that would mean 512GB RAM on the 4C-Die version, which would be enough for _most_ Mac Pro users.
Perhaps Apple is thinking that anyone who needs more than half a Terabyte of RAM should just offload the work to some other computer somewhere else for the time being.
I do think it's a shame that in some ways the absolute high-end will be worse than before, but I also wonder how many 1.5TB Mac Pros they actually sold.
- funny_falcon 5y agoI believe using Optane as fast swap could be great way to increase RAM capacity. Not completely fair, but enough for most usages. It is strange Apple didn't cooperate with Intel in this area.
- rowanG077 5y agoHow is slotted RAM slower? 6400Mhz DIMM exists. This would match the specs of the RAM on the M1 Max. Even octa-channel has been done before so the memory bus would have the exact same width, latency and clock frequency.
- fastball 5y agoThe memory bandwidth of the M1 Max is 400 GB/s with 64GB of RAM, where as the memory bandwidth of Corsair's 6400MHz DDR5 32GB RAM module is 51GB/s per stick, or 102GB/s for the M1 Max equivalent.
- rowanG077 5y ago51GB/s * 8 (octa-channel, not dual channel as you are calculating) is 408 GB/s. Basically the same as the M1 Max. It's not fair to use an off the shelf product since even if the RAM is slotted Apple wouldn't use an off the shelf product. Whether they use slotted RAM or not has nothing to do with performance. It's a design choice. For the mobile processors it makes total sense to save space. But for the Mac pro they might as well use slotted RAM. Unless they go for HBM which does offer superior performance.
- my123 5y agoNote that those are overclocked out of spec configurations today. https://ark.intel.com/content/www/us/en/ark/products/134599/intel-core-i912900k-processor-30m-cache-up-to-5-20-ghz.html https://ark.intel.com/content/www/us/en/ark/products/134599/... 4800 MT/s is the actual maximum spec, anything beyond that is OC.
- mnholt 5y agoAgreed, I think they will use the 4C config to debut M2 and make a slash. They said in the keynote that M1 Ultra completes the M1 family. Timing works out well for November launch with the 2 year apple silicon transition timeline they gave themselves. Not sure what they are going to call it and if it will be A15 or A16 based. A16 would give great performance, and I think it’s safe for them to have a two year iteration time on laptop/desktops vs one year for phone/tablet.
- johnwalkr 5y agoHard to believe it’s already been almost 1.5 years!