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

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101–110 of 217 posts

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

#101
post #82

Earlier quoted context omitted.

Why would you expect better performance at a lower price?

Because the manufacturing techniques have improved? You can see the effects of better manufacturing techniques in other parts.

DRAM is not transistors. Transistors have gotten much smaller much faster than DRAM.

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

#102
post #72
post #52

Earlier quoted context omitted.

Be more excited that ECC is now part of the standard, and without a speed compromise.

Does this mean it will work on any motherboard? On the whole, I find these 20% performance memory upgrade (leading to a fraction of that in real-world performance) more obnoxious than anything, but I'd love ECC!

Yes, ECC is required because the chips themselves have so many issues.

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

#103
post #71

The unanswered question is, will it be cheaper? Price / GB of DRAM hasn't actually fallen much in the 10 years of progression.[1] LPDDR is still over $3/GB. UDIMM is still ~$3 /GB, which is about the same in 2010 / 2011. i.e Despite what you may heard about DRAM price collapse in 2019, the price floor of DRAM has been pretty much the same over the past 10 years. Every other silicon has gotten cheaper, NAND, ICs, just…

> Price / GB of DRAM hasn't actually fallen much in the 10 years of progression.[1]

It has been 10 years since the last company not known to be a party to DRAM cartels has left the market.

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

#105
post #11

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.

How does this play in with the fact that the DDR5 is clocked at 4800mHz and the DDR4 is at 3200? Would we not expect a 50% improvement with respect to transfer rates with a 50% increase in clock? I really don't know.

There are even 4800mHz DDR4 DIMMs available now, even if they are niche.

EDIT: DDR4 is 3200 not 3800.

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

#106
post #93

Earlier quoted context omitted.

Because the manufacturing techniques have improved? You can see the effects of better manufacturing techniques in other parts.

In the end price discovery is supply/demand, and it appears investment in DRAM manufacturing is focused on improving RAM performance, and just keeping up with demand, not outpacing it. Since the barrier to entry is very high, there's not so much pressure to compete further on price.

While it's true that the market ultimately determines pricing, the fact that manufacturers can stuff larger amounts of RAM into the newer equivalent SKUs means the price per GB for fast memory would still be driven down. This is even possible if new unit prices are higher, i.e. if this year's "entry-level" SKU costs a little more than last year's but now has more capacity.

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

#108
post #78

Earlier quoted context omitted.

It seems nearly impossible that they aren't back to price fixing. https://en.wikipedia.org/wiki/DRAM_price_fixing

They aren't price fixing anymore. Now it's called CapEx and water start.

You mean "wafer start" as in reducing production to keep prices high?

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

#109
post #39

Earlier quoted context omitted.

Its 2020 and you're still on a crt?

Eurogamer did write a review about playing modern games on a (very good) CRT monitor [1]. It's better than any LCD and even OLED monitors according to them: [1] https://www.eurogamer.net/articles/digitalfoundry-2019-moder...

[deleted]

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

#110
post #76

One thing I'd like to understand better about DDR5 is how well the built-in ECC is going to work to improve reliability. DDR5 comes with "chip level ECC" [1] of which the main purpose is to be able to better sell highly complicated memory chips with minor defects. But as a consequence as I understand, it will allow for the correction of single bit memory flips. With regular DDR4 or previous generations, you don't get…

I expect Intel to still cripple some aspect of DDR5 ECC on consumer chips; maybe it will correct errors but the memory controller won't report them. Or maybe it's possible to disable ECC even though it's already implemented.

I also expect servers to use two levels of ECC to provide chipkill and also to keep server RAM more expensive than consumer.

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