Samsung's New LPDDR4 Mobile RAM Twice As Fast As Mainstream PC DDR3

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With so few devices shipping with more than 2GB RAM nearly two years after 2GB started becoming sort-of-standard, I would consider myself relatively happy if 3GB became common in 2015. I would not be surprised if Samsung ended up being the only one shipping phones and ARM-based tablets with 4GB RAM in 2015.
 
3200mbps how is this twice as fast? ddr3 1600 has maximum transfer rate of 25.6 GB/second

Names Memory Clock I/O Bus Clock Transfer Rate Theoretical Bandwidth
DDR-200, PC-1600 100 MHz 100 MHz 0.2 GT/s 1.6 GB/s
DDR2-800, PC2-6400 200 MHz 400 MHz 0.8 GT/s 6.4 GB/s
DDR3-1600, PC3-12800 200 MHz 800 MHz 1.6 GT/s 12.8 GB/s
DDR4-3200, PC4-25600 400 MHz 1600 MHz 3.2 GT/s 25.6 GB/s
 
PDDR4 and Wide I/O 2 are key new standards for memory interfaces,” said Quddus.

LPDDR4 will effectively double the data bandwidth of its predecessor LPDDR3 to achieve 4.12Gbit/s.

Wide I/O mobile DRAM is very much a high bandwidth memory interface for 3D gaming and HD video, with 1080p H.264 video, pico projection.

It uses chip-level three dimensional stacking of memory chips interconnected with through silicon via (TSV) links. Memory bandwidth is up to 17Gbyte/s.
- See more at: http://www.electronicsweekly.com/news/general/lpddr4-mobile-memory-fast-track-2014-05/#sthash.vAe9w7PM.dpuf
 

Your own table contradicts you, quoting DDR3-1600 at 12.8GB/s - your table is for single-channel (64bits) DRAM interface. To get 25.6GB/s out of DDR3-1600, you need a dual-channel (128bits) interface and if you use a dual-channel DDR4-3200, then you would get 53.2GB/s.

I would be more interested in the latencies. DDR4-2400 is typically 15-16 cycles so I would expect DDR4-3200 to be 20-22 cycles.
 
"we are contributing to the timely launch of UHD, large-screen flagship mobile devices"

I hope that doesn't happen anytime soon.
Current mobile GPUs can barely push QHD, and I doubt they'll be enough to power 4K a year from now.

Besides, I'd rather not have the GPU performance improvements wasted on pushing those extra pixels, which is exactly what's happening to the Adreno 420 currently.
 
you are missing the point. I just made a typo. The chart is correct. according to this article the new ram is going to be 400MB per second. 3,200 Mbps / 8 400MB per second is still way slower than 12.8GB/ Second. The true number for the new memory is bandwidth is up to 17Gbyte/s. The article is inaccurate.
 

Even if they did, the K1 already drains batteries in little more than two hours driving graphics-intensive stuff at 1200p. If you quadruple the K1's processing power to drive UHD, you would end up burning through the battery in little more than an hour even if you assume power efficiency will double from going 14-16nm.

The saddest part about those ultra-high resolutions that they will end up on 4-6" devices is that most people will hardly be able to tell the difference on under normal everyday viewing conditions.
 
you are missing the point. I just made a typo. The chart is correct. according to this article the new ram is going to be 400MB per second. 3,200 Mbps / 8 400MB per second is still way slower than 12.8GB/ Second. The true number for the new memory is bandwidth is up to 17Gbyte/s. The article is inaccurate.
Click to expand...

I think you are getting DDR RAM and LPDDR RAM confused as you use DDR RAM inside a desktop and laptops while LPDDR RAM is used in cameras, cellphones, tablets, etc. as LPDDR uses less power but before of the lower power requirements less data can be transfered to and from it.
While DDR4 is quick and fast LPDDR4 is about as good as DDR3 in the throughput to and from it. This is good as it means higher resulations on embedded devices but it meianly means nothing to us consumers who are not into building a computer chip by chip which btw is super expenive unless you are buying in bulk then it would be a waste to only build 1 and not a ton of computers.
 
smart phones are for the masses of sheep or are slaves to them. It will never replace my desktop computer that is literally a thousand times faster when you combine GPU and CPU compute ability. Smart phones are just a phase and will be replaced by holograms.
 


LPDDR4 Mobile RAM Twice As Fast As Mainstream PC DDR3

 

Not really since most mobile SoCs only have a 64bits-wide memory bus while desktop chips are 128bits-wide. Also, although the stock speed of most desktop CPUs might only be 1600MT/s, DDR3 pricing is relatively flat up to 2133MT/s these days. For desktop DDR4, I doubt anything below 2400MT/s will have much of a commercial life beyond (very) early adopters.
 


single chip of LPDDR4 against a single stick of DDR3 yes but mutliple sticks of LPDDR4 against dual, tri or quad channel DDR3 the bandwidth of DDR3 doubles and the LPDDR4 stays the same thus DDR3 is about the same as LPDDR4 as LPDDR4 = dual channel DDR3 which the majority of users are using in their computers. This is because the processor goes to the memory controller or has it intergrated depending on which ARM processor they choose to use of course and the memory controller is only supporting single channel memory not dual, tri, nor quad or whatever else is out there besides these standards of memory.
LPDDR4 is good for embedded devices but in that most embedded devices will only have 1 maybe 2 chips of it not the many channels of DDR3, DDR4, nor HBM which we have now ... HBM is still in the testing phase though so it is in no actual consumer device yet anyways.
 
Really great for the mobile market. I think this will have little to no effect on the overall desktop market since the bandwidth from DDR3 is sufficient and the power savings are less important there, but I would love to see this making it into laptops. Paired with upcoming 20nm and smaller CPUs and GPUs that should be coming next year, battery life is about to really jump.
 
I can see no effect for the ussual end user though for moble phones / cell phones and/or tablets this does make sense a little redesign of the ARM processor in them to support LPDDR4 and you can have a much better cam on a phone and/or on a tablet than you have now.

For the desktop this is almost meaningless unless you count the inovations that went into it and how those ideas can be used in other places for example in a SSD instead of useing DDR3 they could use LPDDR4 useing less power and higher bandwidth to transfer more data and quicker between the cache and the computer and/or the cache and the SSD ... there are probably a ton of other uses but that is the first one which came to mind for desktop uses of LPDDR4.
 

3200 mbps is the IO data rate, you have to multiply by the number of bits transferred at a time - 64 bits for single channel, 128 bits for dual channel.

For single channel that makes it 204,800 Mbps = 25,600 MB/s, which is twice what you get with single-channel DDR3-1600. And obviously exactly the same as you get with dual-channel DDR3-1600.
 
With so few devices shipping with more than 2GB RAM nearly two years after 2GB started becoming sort-of-standard, I would consider myself relatively happy if 3GB became common in 2015. I would not be surprised if Samsung ended up being the only one shipping phones and ARM-based tablets with 4GB RAM in 2015.
Click to expand...
No reason why any laptop should not have at least 8GB's of memory out of the box today, unless you are talking about a sub-400 dollar box.
As to tablets and phones? Yeah, 4GB's is about all you can expect RAM wise unless you are talking about 400 dollar + devices.
 
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