[AnandTech] SK Hynix: Up to DDR5-8400 at 1.1 Volts - Overclock.net - An Overclocking Community
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[AnandTech] SK Hynix: Up to DDR5-8400 at 1.1 Volts

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post #1 of 114 (permalink) Old 04-03-2020, 10:50 AM - Thread Starter
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[AnandTech] SK Hynix: Up to DDR5-8400 at 1.1 Volts

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As we've already mentioned, SK Hynix already has DDR5-6400 in its sights which are built upon its second-generation 10nm class fabrication node. SK Hynix has now listed that it plans to develop up to DDR5-8400. Similar in methodology to its DDR5-6400 DRAM, DDR5-8400 requires much more forethought and application. What's interesting about SK Hynix's DDR5-8400 is the jump in memory banks, with DDR5-8400 using 32 banks, with 8 bank groups.

Not just content at increasing overall memory bandwidth and access performance over DDR4, the new DDR5 will run with an operating voltage of 1.1 V. This marks a 9% reduction in DDR4 operating voltage which is designed to make DDR5 more power-efficient, with SK Hynix reporting that it aims to reduce power consumption per bandwidth by over 20% over DDR4.

To improve performance and increase reliability in server scenarios, DDR4-8400 will use on-die ECC (Error Correction) and ECS (Error Check and Scrub) which is a milestone in the production of DDR5. This is expected to reduce overall cost reduction, with ECS recording any defects present and counts the error count to the host. This is designed to improve transparency with the aim of providing enhanced reliability and serviceability within a server system. Also integrated into the design of the DDR5-8400 DRAM is Decision Feedback Equalization (DFE), which is designed to eliminate reflective noise when running at high speeds. SK Hynix notes that this increases the speed per pin by a large amount.

https://www.anandtech.com/show/15699/sk-hynix-ddr5-8400

The 8700K's memory controller goes up to 8533
https://www.kitguru.net/components/m...oard-review/4/
1 / (0.91v x 0.91v ) = 1.20x
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post #2 of 114 (permalink) Old 04-03-2020, 03:20 PM
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So does this mean all development on faster DDR4 parts has ceased?

The 8700k's IMC might allow for 8533Mhz. speeds but I'd bet it won't function at anything near 8533Mhz speeds.
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post #3 of 114 (permalink) Old 04-03-2020, 04:03 PM
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Hi,
Unless they can do it on quad channel

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post #4 of 114 (permalink) Old 04-03-2020, 08:23 PM
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It is a big number. Hard to put in context without a platform to test on.

As enthusiasts, we usually benefit more from lower latency than higher bandwidth.
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post #5 of 114 (permalink) Old 04-03-2020, 10:04 PM
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Quote: Originally Posted by ThrashZone View Post
Hi,
Unless they can do it on quad channel
DDR5 will change the way RAM channels work; each stick will be dual channel, thus a single stick of DDR5 RAM will be dual channel and two sticks will increase it to quad channels.

Sadly as consumers we won't see any benefit from this increase in RAM.

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post #6 of 114 (permalink) Old 04-03-2020, 11:11 PM
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post #7 of 114 (permalink) Old 04-03-2020, 11:43 PM
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Id like to see an i5 8400 running ddr5 8400.

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post #8 of 114 (permalink) Old 04-04-2020, 01:46 AM - Thread Starter
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AMD's cpus run at 1:2 ratio for the 3800mhz/1900mhz with DDR4.
With DDR5, AMD cpus would run 7600mhz/1900mhz for a 1:4 ratio?
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post #9 of 114 (permalink) Old 04-04-2020, 02:03 AM
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Quote: Originally Posted by Kana Chan View Post
AMD's cpus run at 1:2 ratio for the 3800mhz/1900mhz with DDR4.
With DDR5, AMD cpus would run 7600mhz/1900mhz for a 1:4 ratio?
hopefully zen4 and above will increase infininty fabric speed to cope with this memory..we really need better memory latency for high hz monitors.

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post #10 of 114 (permalink) Old 04-04-2020, 02:19 AM
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DDR5 looking more promising, hopefully enabling ECC and ECS for consumer sticks by default as well.

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