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JEDEC Announces Publication of DDR4 Standard

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#1
JEDEC Solid State Technology Association, the global leader in the development of standards for the microelectronics industry, today announced the initial publication of its widely-anticipated Synchronous DDR4 (Double Data Rate 4) standard. JEDEC DDR4 (JESD79-4) has been defined to provide higher performance, with improved reliability and reduced power, thereby representing a significant achievement relative to previous DRAM memory technologies. The new DDR4 standard is available for free download from the JEDEC website at http://www.jedec.org/standards-documents/results/jesd79-4%20ddr4.

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#2
Quicker memory is always a good thing. Uh, DDR4 with GPU + CPU unified memory space which requires more bandwidth is good. Latency of course will remain the same, or will get a bit higher on first modules as always.

That stacking possibility promises good densities and the lower voltage will get our laptops more time on battery.
 
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#3
Just seemed like a bunch of marketing talk with a few numbers to me. How big of a step will ddr4 make?
 
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#4
About damn time, can't wait to get rich and build me a computer that can use it.
 
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#5
Dammit, just upgraded to DDR3
 
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#6
Basic features of DDR4:
- starting at DDR-1600, spec upto DDR-3200, extensions are likely (vs. DDR-800 to DDR-1600 and extended to DDR-1866 and finally DDR-2133)
- 1.2V operating voltage (vs. 1.5V for DDR3)
- multiple dies in a package for higher capacities.
- one DIMM per channel

That last thing will have a great impact for users. DDR4 is point-to-point in nature, meaning only one DIMM per channel is allowed. And that means most DDR4 motherboards will likely have only two DIMM slots as CPU memory controller bus widths and motherboard tracings would have to be increased beyond conventional 128bits (192bits for Nehalem). And that's not likely to happen as it would seriously drive PCB complexity (=cost) up.
 
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#7
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#9
Hell, I'm running DDR400.
 
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#10
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#11
I know it always starts this way, with a low initial spec, but it would be pretty rad if by the time we had 20nm CPUs (no, not gpus) from AMD/nvidia we had chips specced the same as lower-end gddr5. If the GPU is going to more-or-less be allocated half the bandwidth of a CPU from now on it really needs to happen, and realistically I don't see why it couldn't. Also, ddr4 could then realistically replace (g)ddr3/5 as good-enough on newer low-end discrete gpus.

Granted, while AMD embraces 1866 ddr3 and they seemed to have gone even further with encouraging memory overclocking (or rather memory profiles) with Trinity, that's because they really HAD to. While that's lovely, standards are better.

I'm not worried about Intel/nvidia, they'll finagle some cache/buffer with a smaller gpu in their cpus and be just fine. If AMD continues to shoot for the moon (ie we end up with a cpu that has similar floating point as current-to-upcoming x700 28nm gpus) without doing something similar the spec really needs to ramp, and fast.
 

adrianx

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#12
the complexity of MB will be not get high, because the memory controller this days are located in the cpu. So in the future maybe we will have a cpu (ore more) with a memory controller with 2 or more channels. that in ideea that one channel will take 64bits
 
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#13
Ok, the thread goes like that, who owns stil la Fast Page or EDO ram? :D

I have still lying in the attic a 8088 machine with socketable RAM IC's - man 64KB :D :D (I use it as dummy load for PSU to light up my halogen 12V bulbs there, quite interesting, the thing still boot ups, judging from sounds... :p
 
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#14
If no workaround is found for the one-dimm-per-channel thing, most of us will be better off sticking to DDR3. I can't see there being any significant performance difference between DDR3-1866 and DDR4-2400, or whatever the initial standard is. Just like there isn't any signifcant performance difference between dual and quad channel today. Especially if latencies are very poor to start with.
 
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#15
the complexity of MB will be not get high, because the memory controller this days are located in the cpu.
Feel free to explain why the whereabouts of the mem ctrl would make a difference?
It's the massive memory tracing requirements that cause the complexity when going higher than 128bit.
 
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#16
Feel free to explain why the whereabouts of the mem ctrl would make a difference?
It's the massive memory tracing requirements that cause the complexity when going higher than 128bit.
Tracing will increase. We may only see the additional slots on highend platforms in the first genration of mobo's using DDR4 but it will happen.
 
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#17
The standard will be 8GB sticks ie 16GB total, or for faster or lower end mem 4GB ie 8GB. That is plenty
 
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#18
CPU support

I don't think Intel Haswell will have support for DDR4, but probably Haswell-EX will have.