ddr stands for double data rate, so the clock rate would be 2133 MHz, which is the bottom for desktop ddr4, but understandable, since power efficiency is a priority for mobile devices. Also the bandwidth does seem to correlate to a clock of 2133 MHz
Hmmm, it may actually be twice as fast. My first thought was it was 128bit, but it says 64.
Keep in mind for a desktop system ram bandwidth is ample - it doesn't really make a difference, for example quad channel shows abysmal to no gains in pretty much every software out there, prosumer stuff included.
But mobile platforms could benefit from extra bandwidth, since their GPUs always use system RAM.
What's this talk of "regular" DDR4? Are you referring to DIMMs? That's just a form factor, they use the same die, just in different packages (x4 or x8), on a separate circuit board with a connector.
Also, they do sell DDR4-4266 (2133MHz clock, you're right about that) in DIMMs, so it's not any faster than desktop RAM, it's the same. Which makes sense, since it's the same die, just packaged differently.
I don't believe any CPU memory controller exists to run DDR4 at that rate however (without overclocking), which is probably what you're referring to. No mobile controller can run at 4266 yet either, but they will get there...and so will the desktop CPUs.
From an SI perspective, it's easier to manage a single package x64 however.
But isnt desktop memory (whether ddr2, ddr3, or ddr4) always advertised with the double data rate not the effective clock rate. For example even desktop memory that is sold as ddr3 1600mhz has an actual clock of 800mhz but being that it is double data rate provides equivalent to 1600 mhz, so its advertised as such. So those desktop memory are also classified that same way as the mobile memory I thought? So if you see DDR4 2133 desktop memory its actual clock is 1066 mhz and I dont believe we have DDR4 4266 for desktop as OP mentioned.
You are correct imo. ddrivers 2133 Mhz arent. He divided the MT/s by 2 to get the Mhz, which is nonsense and probably only works in a few cases. But i might be wrong on this too ;)
Link to Newegg selling ddr4 4266? No I agree with the others, I do not think those sticks exist. It is not 2133 ram being talked about here. It seems that somehow mobile ram has significantly outpaced desktop ram speeds.
From the source: "The new 8GB LPDDR4 operates at up to 4,266 megabits per second (Mbps), which is twice as fast as DDR4 DRAM for PCs working typically at 2,133 Mbps per pin. Assuming a 64 bit (x64) wide memory bus, this can be viewed as transmitting over 34GBs of data per second."
Trace length, mostly. With the really, really short distances of PoP packging, you can crank the speeds a fair bit higher and then have the internals arranged differently to not need very different DRAM cells.
The frequency of the bus is half the rating, it is reading/writing twice for each clock: https://en.wikipedia.org/wiki/Mobile_DDR . Hence, Double Data Rate (DDR).
And 2 unbuffered DIMMs per channel only makes it worse. I wonder if that will die off for anything other than Xeons, especially after 16Gbit DDR4 comes out.
Which raises the question, why would I need such gargantian amounts of RAM in my phone, if all I do is call, SMS and maybe browse a bit. Is VR a good driver for those crazy capacities? Isn`t GPU a bottleneck right now?
Maybe KabyLake can talk to LPDDR4 and 16Gb single chip would be sweet for ultra thin laptops/whatever they call them this month. Maybe we will see them in the rumored new Macs? They where rumored to have LPDDR4 support and LPDDR3 is official, so a special flavour cpu for Apple would not surprise me.
The cheap phones have a tendency to have rather slow storage cards, so the more apps and data you can load into RAM, the faster it'll be. You can end up with it working basically off of RAM but with the storage card mirroring it.
So I can have more things in background that aren't killed (like my password manager).. For some reason, my phone usage still hits RAM cap with a 4GB phone, and that's still not an improvement over my 3GB phone :/
Because people are stupid and keep a ton of non-sense apps running in the background like they were some kind of CEO/Stock trader who need to know about many things 24/7.
Weather app, twitter, facebook, whatsapp, currency, photos, etc. Why you need to keep all of those open?
Last time I checked, NewEgg offered no LPDDR4 DIMM's. While not yet supported in announced products, Apollo Lake supports LPDDR4. This product is not just for mobile and I will be pleased if independent testing verifies that energy efficiency is doubled.
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RaichuPls - Friday, October 21, 2016 - link
So why is LPDDR4 going up to 4266MHz when normal DDR4 has been basically either 2400-3000?ddriver - Friday, October 21, 2016 - link
it is transfers, not hertzSunnyNW - Friday, October 21, 2016 - link
I thought when it came to dram memory the MT/s translated directly into mhz? For example a 3200mhz memory can also be classified as 3200 MT/s right?ddriver - Friday, October 21, 2016 - link
ddr stands for double data rate, so the clock rate would be 2133 MHz, which is the bottom for desktop ddr4, but understandable, since power efficiency is a priority for mobile devices. Also the bandwidth does seem to correlate to a clock of 2133 MHzajp_anton - Friday, October 21, 2016 - link
But "regular" DDR4 at "2400-3000MHz" does have that as the effective clock, so they are 2400-3000 MT/s (or 1200-1500 MHz clock).ddriver - Friday, October 21, 2016 - link
Hmmm, it may actually be twice as fast. My first thought was it was 128bit, but it says 64.Keep in mind for a desktop system ram bandwidth is ample - it doesn't really make a difference, for example quad channel shows abysmal to no gains in pretty much every software out there, prosumer stuff included.
But mobile platforms could benefit from extra bandwidth, since their GPUs always use system RAM.
fatpenguin - Monday, October 24, 2016 - link
What's this talk of "regular" DDR4? Are you referring to DIMMs? That's just a form factor, they use the same die, just in different packages (x4 or x8), on a separate circuit board with a connector.Also, they do sell DDR4-4266 (2133MHz clock, you're right about that) in DIMMs, so it's not any faster than desktop RAM, it's the same. Which makes sense, since it's the same die, just packaged differently.
I don't believe any CPU memory controller exists to run DDR4 at that rate however (without overclocking), which is probably what you're referring to. No mobile controller can run at 4266 yet either, but they will get there...and so will the desktop CPUs.
From an SI perspective, it's easier to manage a single package x64 however.
SunnyNW - Friday, October 21, 2016 - link
But isnt desktop memory (whether ddr2, ddr3, or ddr4) always advertised with the double data rate not the effective clock rate. For example even desktop memory that is sold as ddr3 1600mhz has an actual clock of 800mhz but being that it is double data rate provides equivalent to 1600 mhz, so its advertised as such. So those desktop memory are also classified that same way as the mobile memory I thought? So if you see DDR4 2133 desktop memory its actual clock is 1066 mhz and I dont believe we have DDR4 4266 for desktop as OP mentioned.SunnyNW - Friday, October 21, 2016 - link
Edit: I meant actual clock not effective, oops and correct me if I'm wrong about this.paulemannsen - Saturday, October 22, 2016 - link
You are correct imo. ddrivers 2133 Mhz arent. He divided the MT/s by 2 to get the Mhz, which is nonsense and probably only works in a few cases. But i might be wrong on this too ;)ddriver - Saturday, October 22, 2016 - link
It is not nonsense, DDR4266 is indeed listed to have 1133 MHz clock, and it works for all cases, because that's what "double" means - multiplied by 2https://en.wikipedia.org/wiki/Mobile_DDR
ddriver - Saturday, October 22, 2016 - link
Typo - 2133 MHzRocket321 - Monday, October 24, 2016 - link
Link to Newegg selling ddr4 4266? No I agree with the others, I do not think those sticks exist. It is not 2133 ram being talked about here.It seems that somehow mobile ram has significantly outpaced desktop ram speeds.
wolfemane - Tuesday, October 25, 2016 - link
maybe you need to look harderhttp://www.newegg.com/Product/Product.aspx?Item=N8...
wolfemane - Tuesday, October 25, 2016 - link
and anotherhttp://www.newegg.com/Product/Product.aspx?Item=N8...
wolfemane - Tuesday, October 25, 2016 - link
oh SNAP! and anotherhttp://www.newegg.com/Product/Product.aspx?Item=N8...
Rocket321 - Wednesday, November 2, 2016 - link
wolfemane - you win! I didn't realize there were DDR4 sticks running that fast.nandnandnand - Tuesday, October 25, 2016 - link
From the source: "The new 8GB LPDDR4 operates at up to 4,266 megabits per second (Mbps), which is twice as fast as DDR4 DRAM for PCs working typically at 2,133 Mbps per pin. Assuming a 64 bit (x64) wide memory bus, this can be viewed as transmitting over 34GBs of data per second."ZeDestructor - Friday, October 21, 2016 - link
Trace length, mostly. With the really, really short distances of PoP packging, you can crank the speeds a fair bit higher and then have the internals arranged differently to not need very different DRAM cells.danjw - Saturday, October 22, 2016 - link
The frequency of the bus is half the rating, it is reading/writing twice for each clock: https://en.wikipedia.org/wiki/Mobile_DDR . Hence, Double Data Rate (DDR).psychobriggsy - Saturday, October 22, 2016 - link
Because the signal lengths from memory controller to memory are so much shorter for LPDDR4.Standard DDR has to go several cm over a motherboard, and through a connector.
yuhong - Sunday, October 23, 2016 - link
And 2 unbuffered DIMMs per channel only makes it worse. I wonder if that will die off for anything other than Xeons, especially after 16Gbit DDR4 comes out.yuhong - Friday, October 21, 2016 - link
I think they are doing 16Gbit LPDDR4 instead of DDR4 this time because that can tolerate large die sizes better, right?Michael Bay - Friday, October 21, 2016 - link
Which raises the question, why would I need such gargantian amounts of RAM in my phone, if all I do is call, SMS and maybe browse a bit. Is VR a good driver for those crazy capacities? Isn`t GPU a bottleneck right now?keeepcool - Friday, October 21, 2016 - link
Maybe KabyLake can talk to LPDDR4 and 16Gb single chip would be sweet for ultra thin laptops/whatever they call them this month.Maybe we will see them in the rumored new Macs?
They where rumored to have LPDDR4 support and LPDDR3 is official, so a special flavour cpu for Apple would not surprise me.
Michael Bay - Friday, October 21, 2016 - link
You`re probably right. I got "mobile devices" and phones conflated.extide - Sunday, October 23, 2016 - link
16Gb is only 2GB so .. you would still need a few.Rocket321 - Monday, October 24, 2016 - link
They can be stacked 4 high, giving 8GB in the area of one die.stephenbrooks - Friday, October 21, 2016 - link
The cheap phones have a tendency to have rather slow storage cards, so the more apps and data you can load into RAM, the faster it'll be. You can end up with it working basically off of RAM but with the storage card mirroring it.ZeDestructor - Friday, October 21, 2016 - link
So I can have more things in background that aren't killed (like my password manager).. For some reason, my phone usage still hits RAM cap with a 4GB phone, and that's still not an improvement over my 3GB phone :/drbroom - Saturday, October 22, 2016 - link
Maybe this will make an appearance in the Nintendo Switch?prisonerX - Monday, October 24, 2016 - link
640K should be enough for anyone.Lolimaster - Monday, October 24, 2016 - link
Because people are stupid and keep a ton of non-sense apps running in the background like they were some kind of CEO/Stock trader who need to know about many things 24/7.Weather app, twitter, facebook, whatsapp, currency, photos, etc. Why you need to keep all of those open?
Pippa Loyal - Friday, October 21, 2016 - link
Did this xplode as well?Michael Bay - Friday, October 21, 2016 - link
Whatever their phone faults may be, SEC RAM is usually solid.cditty - Friday, October 21, 2016 - link
Can we give it a freaking rest? It's tiresome to see every single article about something Samsung makes have a set of explosion comments.TheinsanegamerN - Monday, October 31, 2016 - link
you seem a bit FIRED up.zeeBomb - Saturday, October 22, 2016 - link
Samsung ahead of the game with their semiconductors...I would LOVE to see this on a Tablet or a special Note version.Lolimaster - Monday, October 24, 2016 - link
So LPDDR4 for mobile devices is advancing faster than PC DRAM. Where is DDR4 4266 CL17-18?32GB sticks?
dealcorn - Monday, October 24, 2016 - link
Last time I checked, NewEgg offered no LPDDR4 DIMM's. While not yet supported in announced products, Apollo Lake supports LPDDR4. This product is not just for mobile and I will be pleased if independent testing verifies that energy efficiency is doubled.