DDR4 Cas rates higher then expected.

[ViruZ_HUN]

Some bad news about DDR4, we hope they can lower the CAS but seems like a no.

 

Information:

 

source: http://www.anandtech.com/show/8167/computex-2014-geil-shows-ddr4-with-suggested-cas-latencies

 

 

 

 

 

One of the big launches this year will be the Haswell-E platform.  It is pretty much common knowledge in hardware discussions that this means Haswell-E, X99 and DDR4 will effectively launch to the consumer on the same day.  One element of that link that we have the fewest leaks and information from is the DRAM side.  I explicitly asked the DRAM manufacturers I have most contact with if they would be showing any DDR4 – either modules, specifications or in action.  Many of them obliged – it helps that a fair number also make SSDs and so Kristian was able to get a few snapshots.  But talking to GeIL at Computex also revealed something a little more interesting: CAS Latencies.

Memory, as I attempt to convey in reviews, is more than just the frequency stated.  There are several sets of subtimings associated with the memory, often divided up into primary subtimings, secondary and tertiary.  The primary ones are the most important, and arguably one of the most important of those is called the CAS Latency, or CL for short.  Memory is usually quoted as a combination of frequency and CL, and in the past it has been easy to compare kits by comparing the results of Frequency divided by CL, such that the kit with the higher result is often the better performing.

Moving from DDR3 to DDR4 means a move from 280-pin to 288-pin connections.  The layout of the modules is slightly different, with the pins being different lengths (notice in the image above how the pins in the middle are longer than those at the edge) in order to help installing memory.  Voltage moves down from 1.5 V to 1.2 V, and processors are expected to support DDR4-2133 by default.

Most manufacturers on the Computex show floor were coy with what sub-timings they will aim for their modules, whereas GeIL had a handy list:

So when GeIL offers below 2133 MHz, I am a little taken aback, because their answer is ‘because some people will use it’.  I hope that the reason they will use it is because the processor will not support above 1600 MHz.  But this list gives that clear indication of CAS Latency between 1600 Mhz and 2400 MHz, with indications that 2666 MHz and 3200 MHz might be more common than we think.

CAS Latency for DDR4 does seem a little down compared to DDR3, though this might be due to the initial batches of ICs coming through.  I remember 2133 C11 being the first 2133 MHz DRAM off of the shelf, but now we can buy 2133 C8 very easily.

[ericlee30]

Yeah, I kind of already figured that, but still X99 FTW

[JLCitadel]

Wow

[Recon-UK]

DDR3 FTW.

[ViruZ_HUN]

Yeah, I kind of already figured that, but still X99 FTW

X99 for the win!

 

[IG-88]

Everybody already knew the CL was going to go up compared to DDR3. Its a side effect of increasing the frequency. Also remember this is the first consumer DDR4, the specs will get better with time.

[ZetZet]

Everybody already knew the CL was going to go up compared to DDR3. Its a side effect of increasing the frequency. Also remember this is the first consumer DDR4, the specs will get better with time.

but but 1600mhz exists in cl8 already

[ViruZ_HUN]

@wng_kingsley7

 

(dat naim)

[Recon-UK]

but but 1600mhz exists in cl8 already

We even have CL7 1600mhz, my GEIL Black Dragon set does CL7 LOL.

[IG-88]

but but 1600mhz exists in cl8 already

but 128GB DDR4 on x99 vs 32GB DDR3 on z97

[ZetZet]

but 128GB DDR4 on x99 vs 32GB DDR3 on z97

but who needs that amount of ram. period? You can't fully use 32gb unless you're doing something insane. Using 128GB is just impossible unless RAMdisk.

[Wildlord12]

but 128GB DDR4 on x99 vs 32GB DDR3 on z97

who needs 128gb anyways?

 

edit: unless someone doing something insane or/and ramdisk 

[ViruZ_HUN]

but 128GB DDR4 on x99 vs 32GB DDR3 on z97

I module is 128 Gb

 

8 x 128 = 1024 GB ram on X99 vs Z97s 32 Gb:D LOL

[IG-88]

content creators and people that cache with their ram to run programs faster.

[jezza39]

Lol even less reason to be excited. It's gonna have a huge fat early adopters premium and almost negligibly faster. Yawn.

[ViruZ_HUN]

who needs 128gb anyways?

Linus...

[Wildlord12]

Linus...

 

unless someone doing something insane or/and ramdisk

[bluedyguard]

Linus...

 Everybody keeps telling him to open less Chrome tabs, but he just won't listen. In order to help him, we must do a fund-raiser. Every call at 0800-NOTASCAM will donate a paltry sum (only $3,50).  Stop RAM abuse today.

[Sauron]

So the bottom line is that we can stick with ddr3...

[Legion]

Some bad news about DDR4, we hope they can lower the CAS but seems like a no.

 

Information:

 

source: http://www.anandtech...d-cas-latencies

 

 

 

 

 

snip

 

One of the big launches this year will be the Haswell-E platform.  It is pretty much common knowledge in hardware discussions that this means Haswell-E, X99 and DDR4 will effectively launch to the consumer on the same day.  One element of that link that we have the fewest leaks and information from is the DRAM side.  I explicitly asked the DRAM manufacturers I have most contact with if they would be showing any DDR4 – either modules, specifications or in action.  Many of them obliged – it helps that a fair number also make SSDs and so Kristian was able to get a few snapshots.  But talking to GeIL at Computex also revealed something a little more interesting: CAS Latencies.

snip

 

Memory, as I attempt to convey in reviews, is more than just the frequency stated.  There are several sets of subtimings associated with the memory, often divided up into primary subtimings, secondary and tertiary.  The primary ones are the most important, and arguably one of the most important of those is called the CAS Latency, or CL for short.  Memory is usually quoted as a combination of frequency and CL, and in the past it has been easy to compare kits by comparing the results of Frequency divided by CL, such that the kit with the higher result is often the better performing.

Moving from DDR3 to DDR4 means a move from 280-pin to 288-pin connections.  The layout of the modules is slightly different, with the pins being different lengths (notice in the image above how the pins in the middle are longer than those at the edge) in order to help installing memory.  Voltage moves down from 1.5 V to 1.2 V, and processors are expected to support DDR4-2133 by default.

Most manufacturers on the Computex show floor were coy with what sub-timings they will aim for their modules, whereas GeIL had a handy list:

snip

 

So when GeIL offers below 2133 MHz, I am a little taken aback, because their answer is ‘because some people will use it’.  I hope that the reason they will use it is because the processor will not support above 1600 MHz.  But this list gives that clear indication of CAS Latency between 1600 Mhz and 2400 MHz, with indications that 2666 MHz and 3200 MHz might be more common than we think.

CAS Latency for DDR4 does seem a little down compared to DDR3, though this might be due to the initial batches of ICs coming through.  I remember 2133 C11 being the first 2133 MHz DRAM off of the shelf, but now we can buy 2133 C8 very easily.

snip

 

 

 

 

Fixed for dark theme -.-

Now I can read :L

Op when you paste from an article can you please use CTRL SHIFT V

[IG-88]

So the bottom line is that we can stick with ddr3...

Unless you're switching to x99 when it releases, you will have to stick with ddr 3.

[LukaP]

who needs 128gb anyways?

rendering, content creation... you know, the stuff x99 is meant for

 

i would love as much ram as possible, as it means more and more unique textures, more detailed meshes, better light tracing, accuracy...

[Sauron]

Unless you're switching to x99 when it releases, you will have to stick with ddr 3.

Well yes, I was just saying it's not worth it upgrading because of ddr4.

[IG-88]

Well yes, I was just saying it's not worth it upgrading because of ddr4.

If your only use for a pc is gaming or web browsing, then no its not worth it.

[Wildlord12]

rendering, content creation... you know, the stuff x99 is meant for

 

i would love as much ram as possible, as it means more and more unique textures, more detailed meshes, better light tracing, accuracy...

true