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DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

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Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#11

Post by brixon »

nullifidian wrote: post #3

Will we get performance increases, and how big will they be in the average case, not for some specific codes with low cache hit ratio on large datasets, and attributed solely to bandwidth increases and not architecture IPC improvements?

"For bandwidth, other memory manufacturers have quoted that for the theoretical 38.4 GB/s that each module of DDR5-4800 can bring, they are already seeing effective numbers in the 32 GB/s range. This is above the effective 20-25 GB/s per channel that we are seeing on DDR4-3200 today."

That looks like a 20%+ improvement IF you are bottle-necking on DDR4.

Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#13

Post by TuringNYC »

orliesaurus wrote: post #6

Yeah, but to the casual user like me, that's going to help with load times... go from 2 seconds to 1 second.

Often the initial consumers would be enterprises instead of casual users. There are numerous enterprise use cases where higher bandwidth and lower latency would be worth the cost. Some that come to mind are in financial services and ML inferencing. I can imagine high-mem compute instances of cloud service providers being an obvious place for these.

Also, going for 2 to 1 seconds is pretty huge if you're doing some operation hundreds or thousands of times a day.

Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#14

Post by Retric »

speeder wrote: post #8
morceauxdebois wrote: post #2

I'm happy that I put off upgrading my pc long enough to skip a RAM generation.

I have a 4690K and my RAM is a 32GB EVGA DDR3 ram that I suspect was made by hynix or the other manufacturer of fast rams, that runs at speed up to par with the slowest DDR4 but with DDR3 latency, it is very awesome. I wonder if DDR5 will be fast enough to compensate for the slower latency (or maybe they improved latency this time?) To be honest I didn't felt yet any need to move off my current machine, I would only…

Latency is significantly impacted by the physical distance between RAM and CPU’s. Which combined with modern cache sizes means they get diminishing returns trying to minimize it and thus make different tradeoffs.

Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#15

Post by Macha »

nullifidian wrote: post #3

Will we get performance increases, and how big will they be in the average case, not for some specific codes with low cache hit ratio on large datasets, and attributed solely to bandwidth increases and not architecture IPC improvements?

Depends a lot on your CPU's architecture as well as workloads, how far ahead it prefetches vs how often it's stalled on large memory reads. So it's hard to know. e.g. Zen+ (Ryzen 2000) was seeing 10% in some gaming workloads going from DDR4-2400 to DDR4-3600, but it's much less drastic on Intel CPUs or even Zen 2 (Ryzen 3000) because the memory controller is smarter so the slower RAM is less of a detriment. And then if you go above 3600mhz (or 3800mhz if overclocked) on zen 2 you start getting negative returns for a bit because the CPU memory controller can no longer run at the same clock as the memory and that induces overhead. But maybe a 4800mhz if it can be stable easier gets far enough ahead of that penalty that the improvement goes positive again. Or maybe Zen 4/DDR5-lake just works with memory entirely differently and the performance gains are massive or neglible.

The short of it is it's very hard to make predictions here.

Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#17

Post by melling »

nullifidian wrote: post #9
orliesaurus wrote: post #6

Yeah, but to the casual user like me, that's going to help with load times... go from 2 seconds to 1 second.

Load times? I doubt it. Load times are more about cpu and nvme.

However, all those people who complained that the Atom editor took too much memory are about to experience a new world when they buy their next computer.

I used Emacs back when people joked “Eight Megs and Constantly Swapping”

Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#18

Post by mirsadm »

orliesaurus wrote: post #6

Yeah, but to the casual user like me, that's going to help with load times... go from 2 seconds to 1 second.

Would you rather wait an hour or 30 minutes?

(putting aside the the fact that faster RAM does not generally result in faster load times)

Re: DDR5 Is Coming: First 64GB DDR5-4800 Modules from SK Hynix

#19

Post by [deleted] »

melling wrote: post #17
nullifidian wrote: post #9

Earlier quoted context omitted.

Load times? I doubt it. Load times are more about cpu and nvme.

However, all those people who complained that the Atom editor took too much memory are about to experience a new world when they buy their next computer. I used Emacs back when people joked “Eight Megs and Constantly Swapping”

[deleted]
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