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Non-binary DDR5 memory could be a game-changer for businesses everywhere

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Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#41
post #4

This is a short article about allowing RAM sizes that aren't powers of 2, like 24 GB or 48 GB instead of just the steps 8 GB, 16 GB, 32 GB. I initially thought this was going to be about using multiple states on the data pins to encode more bits per clock.

I thought it was going to be about non-binary RAM: RAM cells that store information in one of 3+ states.

[deleted]

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#43
post #21

Earlier quoted context omitted.

Can’t you use ternary internally but exposed binary to the system?

That's what PAM-4 signaling does. Quaternary signals can be easily broken up to binary ones on the other end because the bits divide cleanly. For the same reason why hexadecimal encodes binary very well. Signalling systems that don't divide cleanly into a number of bits are more complicated to work with; you need to group bits together into another group of terts[0] and assign states to each. It's less like "picking…

RAM works on a wide set of bits per transfer so if you're using ternary the mapping will waste very little. Encoding 64 bits in ternary only wastes half a bit in the mapping for example which is less than 1% waste and thus irrelevant. It would even be a good moment to do a mapping that includes ECC by default as ternary signal integrity may very well be trickier and all RAM should have ECC anyway.

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#45
post #4

This is a short article about allowing RAM sizes that aren't powers of 2, like 24 GB or 48 GB instead of just the steps 8 GB, 16 GB, 32 GB. I initially thought this was going to be about using multiple states on the data pins to encode more bits per clock.

GDDR6X uses PAM-4 - I think it's the first memory technology to do so.

There is some talk of PAM-3 or PAM-4 for DDR6, too, but it has nothing to do with array size or how data is stored - it's just the transfer format.

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#46
post #8

Can't wait to get my 1TB RAM that's actually only 931GB

This is because of the units used. Advertising/sales uses units with factors of 1000 (KB, MB, TB), while computers use factors of 1024 (KiB, MiB, TiB).

So your 1TB is definitely 1000GB. But it's 931 GiB.

Some claim it was easier for consumers to understand factors of 1000 rather than 1024. But conveniently it also makes the number look bigger for no extra cost, so eh. I'd put my money on the later.

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#47
post #8

Can't wait to get my 1TB RAM that's actually only 931GB

Ah yes, the "advertiser's gigabyte". Sort of like a "baker's dozen" but in reverse.

They are honest in how many terabytes/gigabytes.

But the computer doesn't report gigabytes (GB). It reports Gibibytes, GiB. Different units.

Not saying it's not a dumb situation, just why it's happening.

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#48
post #4

This is a short article about allowing RAM sizes that aren't powers of 2, like 24 GB or 48 GB instead of just the steps 8 GB, 16 GB, 32 GB. I initially thought this was going to be about using multiple states on the data pins to encode more bits per clock.

I thought it was going to be about non-binary RAM: RAM cells that store information in one of 3+ states.

While it's possible to implement either of these, it made more sense to me that it would be both.

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#49

This reads like an AI generated nonsense article.

No kidding, the last paragraph in particular sounds written by GPT:

> Overall, the release of the non-binary DDR5 RAM is a major milestone in the tech industry and is expected to have a significant impact on the way that devices are designed and used. It is likely that we will see a wide range of devices adopting the new memory technology in the coming years, as businesses look to take advantage of its many benefits.

https://openai-openai-detector.hf.space/ rates the article as 99.98% fake; I wonder if it is in fact an AI-generated summary of the Register article it links to.

(Edit to add: the same tool rates the source Register article as 99.98% real.)

Re: Non-binary DDR5 memory could be a game-changer for businesses everywhere

#50
post #8

Can't wait to get my 1TB RAM that's actually only 931GB

Ah yes, the "advertiser's gigabyte". Sort of like a "baker's dozen" but in reverse.

Most of my data structures exist in powers of two memory space. All of my calculations of complexity are also represented in powers of two. If I double the data I'm dealing once, twice, ten times, I expect to have to increase my storage by the same amount, not by 103% for each interval.
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