Comparision. The affect of Cas latency and frequency on the performance of Rams

[mclaren85]

Below you can see the comparision of two types of ram modules; one of them specified as 1600 MHZ with 11ns cas latency, the other one is 1333MHZ with 9ns cas latency. According to my test results, frequency is more important than the Cas latency, notwithstanding the performance difference merely impacting the daily process. The CPU tests were also in favour of 1600 MHZ version of ram but the difference was trivial.
As you can see the, 1600 MHZ version tests were on the left side of the panel.
Hope this information helps those who are delving into RAM specs but are struggling to decide which one to choose.
*** Many thanks to @S456 for kindly correcting me about CAS. please see : https://www.techpowerup.com/forums/...n-the-performance-of-rams.306436/post-4979032

*The two tests were carried out with the same computer (Sony Vaio sve15129cvb), with the same software. (Aida ver 6.75.6100)
**Ram modules were Kingston so-dimm DDR3

 

[P4-630]

Why not test with your desktop.

 

[ThrashZone]

Hi,
Yikes ddr3 ?
Not sure how relevant this info is unless you continue on to ddr4 and then ddr5 then everyone might get the complete picture.

 

[mclaren85]

Why not test with your desktop.

At my desktop, only one type of stick I have: ddr4 3600mhz with 18ns cas.

 

[Calenhad]

At my desktop, only one type of stick I have: ddr4 3600mhz with 18ns cas.

Your desktop can be configured with different settings in the bios. Your 3600MT/s 18ns ram can be run at slower settings for comparison tests. Heck, you can run them with and without XMP enabled for a JEDEC vs XMP settings comparison for starters.

That being said, this information is readily available on the internet. It is one search away for all of us. This horse has been properly dead for many years.

 

[Icon Charlie]

That being said, this information is readily available on the internet. It is one search away for all of us. This horse has been properly dead for many years.

There are many parts in this world that still uses old tech.

Not all of the world is on bleeding edge tech. There are plenty regions of this world STILL USING DDR3 and older tech/OS's
I mean even in the US there is STILL DIAL UP.

Yea you can get the info out there on the internet however the poster collected the information neatly and placed here in one place. He of course did not have to do that and so he wanted to share.

This of course is rather nice to have for a guy like myself that uses 20+ year old tech playing old school PC games instead of using my current "Bleeding Edge" tech for that purpose.

Who states what is obsolete or not depends on what you can get in whatever part of the world you live in. But I can tell you right now that in many parts of the world they are using...

Whatever works.

 

[lemonadesoda]

@mclaren85 , thanks for posting this up. Interesting information. Can you tell me if the CL-RCD-RP-RAS is the JEDEC/SPD profile, or what the laptop is actually running the memory at? Can you double check using the CPU-Z, and also the AIDA64 page below.

 

[TheoneandonlyMrK]

There are many parts in this world that still uses old tech.

Not all of the world is on bleeding edge tech. There are plenty regions of this world STILL USING DDR3 and older tech/OS's
I mean even in the US there is STILL DIAL UP.

Yea you can get the info out there on the internet however the poster collected the information neatly and placed here in one place. He of course did not have to do that and so he wanted to share.

This of course is rather nice to have for a guy like myself that uses 20+ year old tech playing old school PC games instead of using my current "Bleeding Edge" tech for that purpose.

Who states what is obsolete or not depends on what you can get in whatever part of the world you live in. But I can tell you right now that in many parts of the world they are using...

Whatever works.

None of that or anything else changed physics in the las 10 years though so as was said this is known, there's no need.

I'll put a fiver on it ddr3 cas v speed comparisons are on TPU done by a Tpu bench tech with many kit's.

So yes old stuff lives on but no there's no new good info here

 

[mclaren85]

@mclaren85 , thanks for posting this up. Interesting information. Can you tell me if the CL-RCD-RP-RAS is the JEDEC/SPD profile, or what the laptop is actually running the memory at? Can you double check using the CPU-Z, and also the AIDA64 page below.

View attachment 289188View attachment 289190

Here you are:

 

[S456]

The CL is not measured in nanoseconds, they are clock cycles.
1600 CL11 = 13.75ns
1333 CL9 = ~13.5ns

Edit:
11*2000/1600 = 13.75ns
9*2000/1333 = 13.50ns

 

[lemonadesoda]

@mclaren85 , The difference in your tRTR and tWTR (compared to mine) is extraordinary. I think I'd better run AIDA64 on my laptop to see how "bad" my memory speeds are, despite being a nice laptop.

OK, well given that result, I have nothing to worry about (compared to your OP tables).

 

[freeagent]

I played with this a little bit when I first got my Royals. In the end I settled on 3200 12-12-12-28 1T GDM off at 1.45v. But that speed was boring lol.. and then a mixed another set with them. The other set won’t run that tight..

On the Intel side I was running 4 sticks at 2133 8-9-8-24 with 1.725, or 2200 with loose 9-10-10-29 I think with same voltage. My 3770K didn’t seem to like high mem speeds.

I do have a 3x2 set of SuperTalent Chrome 2000C8 that are happy at 1600 6-6-6-20 1.65 and 1800 7-7-7-21 1.65v.. good ram.

 

[mclaren85]

@mclaren85 , The difference in your tRTR and tWTR is extraordinary. I think I'd better run AIDA64 on my laptop to see how "bad" it is, despite being a nice laptop.

View attachment 289197
OK, well given that result, I have nothing to worry about (compared to your OP tables).

Here is my benchmark result for my Sony Vaio

And my other laptop, Hp Pavilion G6:

And the custom built MSI desktop:

 

[delshay]

I'm more interested how the OP got DDR3 "SODIMMS" that fast. ...I own real genuine 2133 DDR3L SODIMM from Corsair, Kingston & G.Skill (8 & 16GB Kit) & I don't think it can overclock that high.
These memory stick are now starting to get very rare now including the very rare 32GB kit from G.Skill which I have here..