News Samsung extends LPDDR5 to 12.7 GT/s: Next-gen devices enjoy a nice speed boost

[Admin]

Samsung unveils 16Gb LPDDR5-Ultra-Pro DRAM at 12,700 MT/s with 4-phase self-calibration and AC-coupled transceiver equalization.

Samsung extends LPDDR5 to 12.7 GT/s: Next-gen devices enjoy a nice speed boost : Read more

 

[bit_user]

Cool. So, at 128 bits, that'd be a nominal data rate of 203.2 MB/s?

Also...

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What's "Shmoo"?
: D

Lastly, is LPDDR5 memory stackable? I sort of assumed it must be, or else I don't see how they can possibly fit so much on package. If so, is it all stackable or just specific dies?

 

[usertests]

Are there some benefits to avoiding moving to LPDDR6? Maybe less complexity and initial cost-per-bit?

 

[bit_user]

Are there some benefits to avoiding moving to LPDDR6? Maybe less complexity and initial cost-per-bit?

First, is the spec even finalized?

Second, CPU makers and DRAM makers need to synchronize their launch of products supporting it. So, by releasing faster LPDDR5X, Samsung is possibly getting out ahead of the LPDDR6 transition and perhaps helping CPU makers to do the same.

There are also possibly interesting implications for AI and some server applications. For instance, Nvidia opted to use LPDDR5 with their Grace CPUs, because they said it was 1/3rd the cost of HBM and I think also lower power per bit. I expect their Digits device is using LPDDR5X, as well. Finally, they have that new SOCAMM standard they're working on, and presumably that would use LPDDR5X.

 

[Notton]

Slap this RAM onto a Ryzen 395+ (Strix halo) and, assuming it works, the memory bandwidth hits 406GB/s.
That will easily surpass a RX7600 at 288GB/s, and nip at the heels of a RX7700 at 432GB/s.
Apple M4 Max 14-core hits 410GB/s, while the 16-core version hits 526GB/s.
That is properly fast, and sounds justifiable in a $2800 tablet.

 

[bit_user]

Slap this RAM onto a Ryzen 395+ (Strix halo) and, assuming it works, the memory bandwidth hits 406GB/s.
That will easily surpass a RX7600 at 288GB/s, and nip at the heels of a RX7700 at 432GB/s.

By my calculations, the GPU of the Ryzen 395+ is close to that of the PS5, which has a memory bandwidth of 448 GB/s. Furthermore, although it's higher than regular DDR5, I'd bet the latency of LPDDR5X is lower than GDDR6 and we know games tend to be rather sensitive to memory latency.