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Guru3D.com » News » Cadence and Micron test Prototype 7nm DDR5 DRAM at 4400 MT/s

Cadence and Micron test Prototype 7nm DDR5 DRAM at 4400 MT/s

by Hilbert Hagedoorn on: 05/04/2018 05:49 PM | source: | 12 comment(s)
Cadence and Micron test Prototype 7nm DDR5 DRAM at 4400 MT/s

The DDR5 standard has not been finalized by JEDEC, but that is expected sometime this summer. Cadence created a test chip containing next-generation memory interface IP based on the discussions of what is likely to be in DDR5, and Micron produced the prototype DRAM chips. 

The test chip was fabricated in TSMC's 7nm process, and contains both the controller and PHY. The two chips work together successfully achieving 4400 megatransfers per second, 37.5% faster than the fastest commercially available DDR4 memory. As far as we can tell, this is the first demonstration of DDR5 IP working with memory chips, as reportted on the Cadence blog. 

 

 

DDR5 is mostly a capacity solution, more than performance. As die get bigger, they get slower, due to all sorts of laws of physics. As you start building a 16Gb die in 1X memory technology, the distances start to get really long, which changes a lot of core timing parameters for the worse. Then the memory can't keep up with the CPU and so has to be overdesigned, making it bigger still, and so on. But everyone wants more memory in each server, for bigger datasets, bigger databases, bigger netlists, and so on. Cloud companies charge people for the memory in their instances and so there is a direct line from memory capacity to revenue. The DDR5 standard is aimed at making 16Gb die easier and to make vertical stacking easier. The speed of the core is unchanged, but the I/O is higher speed.

DDR4 today is not up to its maximum speed. Mainstream parts today are 2400 megatransfers per second. The high end is 2667 (for example, look at what you get if you buy a Dell server). That will become mainstream this year, so we are still a couple of years from DDR4 reaching its maximum of 3200 megatransfers per second. DDR5 is expected to be 4400 megatransfers per second at first, which is what the Cadence test chip achieved. 6400 is the maximum but it will be many years before anyone gets there. As Marc kept emphasizing, DDR5 is more about capacity than performance. Memories "don't get faster very fast."

DDR5 Summary (not final)

  • supply voltage will drop from 1.2V for DDR4 to 1.1V for DDR5
  • data rates will run up to 6.4 Gbps eventually, 4.4Gbps initially
  • on-die termination (pulled-up VDDQ) will be available for address buses, not just data buses

What's Next?

Cadence plans to be first again with IP for LPDDR5 and future generations of other memory standards such as HBM. I'm sure I'll be covering them when we are ready to announce.



Cadence and Micron test Prototype 7nm DDR5 DRAM at 4400 MT/s Cadence and Micron test Prototype 7nm DDR5 DRAM at 4400 MT/s




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JamesSneed
Senior Member



Posts: 1115
Joined: 2017-02-14

#5543935 Posted on: 05/04/2018 06:25 PM
Its hard to get to excited about memory. This should be nice boost for AMD's Zen chips once they are using DDR5. Im assuming we are talking after Zen 2 before we see DDR5 in use for AMD chips.

Ricepudding
Senior Member



Posts: 750
Joined: 2017-02-17

#5543945 Posted on: 05/04/2018 06:54 PM
Wow, this would be a huge jump if these are meant to start at 4.4ghz, remember when ddr4 first came out it only went to 2133mhz at first, so wasnt a huge increase over ddr3

Can already see G.skills and corsair trying to push these to 7000mhz XD

icedman
Senior Member



Posts: 1058
Joined: 2013-02-22

#5543951 Posted on: 05/04/2018 07:12 PM
looks like this kit i got for my ryzen last year will be the only ddr4 kit I had to buy and with current prices I say bring on the new tech they cant charge much more of a premium than they already do

nosirrahx
Senior Member



Posts: 304
Joined: 2013-04-05

#5543993 Posted on: 05/04/2018 09:23 PM
CPUs need to get faster and apps need to demand more bandwidth before DDR5 will matter much.

It would be cool to see DDR5 concentrate a little more on getting CAS down a few notches.

If I am not mistaken I saw a vid where DDR4 4000 @ CAS 12 was stable on specific motherboards. It would be cool if that became normal instead of an extraordinary exception.

nevcairiel
Senior Member



Posts: 748
Joined: 2015-05-19

#5544007 Posted on: 05/04/2018 10:18 PM

It would be cool to see DDR5 concentrate a little more on getting CAS down a few notches.

Latency on performance/enthusiast memory sets has actually overall gone down in recent years - if you look at the final actual latency in nanoseconds, and not just the CAS value (since the actual latency is a product of both speed and the memory timings)
But of course we won't know yet which latencies entry-level DDR5 sets are going to use, and how those change in performance/enthusiast kits.

The biggest problems with extremely tight timings is the memory controller in the CPU, though.

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