Live data from Hacker News

LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

ifixit.com

21–30 of 171 posts

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#21
post #6

What's wrong with DIMM?

One of the biggest problems is that edge connections don't give you enough density. Edge connections are great for serves where you stack 16 channels next to each other, but in a laptop form factor, your capacity is already limited, so you can get more wires coming out of the ram by connecting to the face rather than the edge.

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#22
post #15

This is fantastic news. Hopefully the cost to manufacturers is only marginal and they find a suitable replacement for their current "each tier in RAM comes with a 5-20% price bump" pricing scheme. Too bad apple is almost guaranteed to not adopt the standard. I miss being able to upgrade the ram in macbooks.

Apple ships 128 bit, 256 bit, and 512 bit wide memory interfaces on laptops (up to 1024 bit wide on desktops). Is it feasible to fit memory bandwidth like the M3 Max (512 bits wide LPDDR5-6400) with LPCAMM2 in a thin/light laptop?

This PDF[1] suggests that an LPCAMM2 module has a 128 bit wide memory interface, so the epic memory bandwidth of the M3 max won’t be achievable with one of these memory modules. High end devices could potentially have two or more of them arranged around the CPU though?

[1] https://investors.micron.com/node/47186/pdf

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#24
post #15

This is fantastic news. Hopefully the cost to manufacturers is only marginal and they find a suitable replacement for their current "each tier in RAM comes with a 5-20% price bump" pricing scheme. Too bad apple is almost guaranteed to not adopt the standard. I miss being able to upgrade the ram in macbooks.

Apple ships 128 bit, 256 bit, and 512 bit wide memory interfaces on laptops (up to 1024 bit wide on desktops). Is it feasible to fit memory bandwidth like the M3 Max (512 bits wide LPDDR5-6400) with LPCAMM2 in a thin/light laptop?

For 512 bits you would need four LPCAMM2s. I could imagine putting two on opposite sides of the SoC but four might require a huge motherboard.

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#25
post #15

This is fantastic news. Hopefully the cost to manufacturers is only marginal and they find a suitable replacement for their current "each tier in RAM comes with a 5-20% price bump" pricing scheme. Too bad apple is almost guaranteed to not adopt the standard. I miss being able to upgrade the ram in macbooks.

Apple ships 128 bit, 256 bit, and 512 bit wide memory interfaces on laptops (up to 1024 bit wide on desktops). Is it feasible to fit memory bandwidth like the M3 Max (512 bits wide LPDDR5-6400) with LPCAMM2 in a thin/light laptop?

Hoping we see AMD Strix Halo with it's 256-bit interface crammed into an aggressively cooled fairly-thin fairly-light. But it's going to require heavy cooling to make full use of.

Heck, make it only run full tilt when on an active cooling dock. Let it run half power when unassisted.

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#26
post #9

Remember that Haswell laptops were the last to feature socketed CPUs. RAM is nice to upgrade, for sure. As well as an SSD, but CPUs are still a must. I would even suggest upgradeable GPUs but I don't think the money is there for the manufacturers. Why allow you to upgrade when you can buy a whole new laptop?

On a laptop it's not very practical.

Because you can't swap the motherboard, your options for CPUs are going to be quite limited. Generally, only higher-tier CPUs of that same generation - which draw more power and require more cooling.

Generally a laptop is built designed to provide a specific budget of power to the CPU and has a limited amount of cooling.

Even if you could swap out the CPU, it wouldn't work properly if the laptop couldn't provide the necessary power or cooling.

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#27
post #9

Remember that Haswell laptops were the last to feature socketed CPUs. RAM is nice to upgrade, for sure. As well as an SSD, but CPUs are still a must. I would even suggest upgradeable GPUs but I don't think the money is there for the manufacturers. Why allow you to upgrade when you can buy a whole new laptop?

Laptops have always been trading size for upgradeability and other factors, and soldering everything is the way to make them tiny. If you ask me they've gotten too extreme in size. The first laptops were way too bulky, but they hit a sweet spot around 2005-2010, being just thick enough to hold all those D-Sub connectors (VGA, serial, etc).

And soldering stuff to the board is the default way to make something when upgradeability isn't a feature.

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#28
On the other hand, with a reflow station everything becomes modular and repairable.

I do hope that a more widespread usage of compressed attachment gives us some development in that area where projects that were promising modular devices failed (remember those 'modular' phone concepts? available physical interconnects were one of the failures...). Sockets for BGAs have existed for a while, but were not really end-user friendly (not that LGA or PGA are that amazing), so maybe my hope is misplaced and many-contact connections will always be worse than direct attachment (be it PCB or SiP/SoC/CPU shared substrate).

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#29
post #9

Remember that Haswell laptops were the last to feature socketed CPUs. RAM is nice to upgrade, for sure. As well as an SSD, but CPUs are still a must. I would even suggest upgradeable GPUs but I don't think the money is there for the manufacturers. Why allow you to upgrade when you can buy a whole new laptop?

I'm not sure I really get much value out of a socketed CPU, particularly in a laptop, vs something like a swappable MB+CPU combo where the CPU is not socketed. RAM/Storage are great upgrades because 5 years from now you can pop in 4x the capacity at a bargain since it's the "old slow type". CPUs don't really get the same growth in a socket's lifespan.

Socket AM4 had a really good run. Maybe we just have to pressure manufacturers to make old-socket variations of modern processors.

The technical differences between sockets aren't usually huge. Upgrade the memory standard here, add or remove PCIe lanes there. Using new cores with an older memory controller may or may not be doable, but it's quite simple to not connect all the PCIe lanes the die supports.

Re: LPCAMM2 is a modular, repairable, upgradeable memory standard for laptops

#30
post #9

Remember that Haswell laptops were the last to feature socketed CPUs. RAM is nice to upgrade, for sure. As well as an SSD, but CPUs are still a must. I would even suggest upgradeable GPUs but I don't think the money is there for the manufacturers. Why allow you to upgrade when you can buy a whole new laptop?

On a laptop it's not very practical. Because you can't swap the motherboard, your options for CPUs are going to be quite limited. Generally, only higher-tier CPUs of that same generation - which draw more power and require more cooling. Generally a laptop is built designed to provide a specific budget of power to the CPU and has a limited amount of cooling. Even if you could swap out the CPU, it wouldn't work properl…

I can't say I agree. Back in 2014 a laptop was purchased with a dual-core haswell CPU. 8 years later I revive the laptop by upgrading the CPU to almost the best possible CPU, which is a 4-core 8 thread CPU or 4-core 4 threads, I am unsure which of these it was, but the speed boost was massive. This is how you keep old tech alive.

And the good thing about mobile CPUs is that they have almost the same TDP across the various dual-quad versions(or whatever is the norm today).

Post reply on HN