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JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
51–60 of 184 posts
Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
#52Earlier quoted context omitted.
And potentially opens a whole new family of side channels.
I mean nobody really believes there aren’t already countless side channels in existing hardware, right? No reason to give up performance for nothing.
Things are bad, so make no attempt to better or even avoid worsening them?
Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
#53I'm always a fan of bigger numbers, but I wish more time/money/whatever was put into letting DDR5 run at those XMP/EXPO speeds when using 4 DIMMs.
How do you expect that to happen? By sharing memory channels you are no longer using a point to point connection and are now prone to reflections in the PCB traces where you have split the signal. There is no "money" that can be put into this, that won't also improve the performance of the single DIMM per channel setup disproportionately. I don't even understand what your point is. Quad channel support would be a muc…
What if you give each slot independent command pins but not a complete memory channel?
What if you use a similar technology to registered or load-reduced memory, but put the register on the system board instead of the DIMM so it's in front of multiple DIMMs that then share the channel into the processor but not the traces on the system board? This may also allow higher capacity DIMMs in consumer systems.
Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
#54The article doesn't mention much about chip-to-controller distance or path length, presumably this suffers from the same issues we currently see where low power devices (and in some desktop configurations as well) can't really ever get those speeds unless the DRAM chips are near or on top of the CPU substrate.
It's nearly impossible to do those numbers in modern mobile form factors, even CAMM is having a hard time getting there with modularised memory.
Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
#55Earlier quoted context omitted.
I mean nobody really believes there aren’t already countless side channels in existing hardware, right? No reason to give up performance for nothing.
Things are bad, so make no attempt to better or even avoid worsening them?
The front door is already open. Let’s open the bedroom window if we want more fresh air there.
Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
#56Please make ECC mandatory.
Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
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Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
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Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
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Re: JEDEC Extends DDR5 Memory Spec to 8800 MT/S, Adds Anti-Rowhammer Features
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