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1600mhz faster than 1866mhz, x 4 questions PLEASE!

post #1 of 7
Thread Starter 
Hi folks,
When it comes to understanding RAM settings and interpretations, I'll be the first to admit that I'm at a loss. Also, I am aware that the noticeable difference in speeds may be negligible. But that’s not what this question is about; it’s about trying to understand this comparison.

I know that 1866 MHz is faster than 1600 MHz BUT, when I change the speed of my RAM and then compare the results of the two in Memtweakit, my interpretation, (flawed that it may be), of what I see tends to lean toward the 1600 MHz RAM speed being faster in pretty many all resulting categories.

Below are screenshots of the Memtweakit panel, (an Asus product), and the corresponding CPU-Z panels. Please keep in mind that I have an Asrock motherboard and Memtweakit will only give me the results of the changes I make in the UEFI, it can't actually make changes.

You'll notice that there are two sets of screenshots referencing the 1866 MHz speed. One set display the 1866 MHz with a 2T command rate any other with a 1T command rate. (I noticed that the DFS is lower on the 2T setting).

In the end, what I'd really like to know after looking at the screenshots below is which RAM settings would be the fastest? But I made that the last question in hopes that you would break it down a little for me by answering the other 3 first. So here they are:

A] How important is the "Dram Frequency Score", (DFS), and is it better to be lower or higher in that score?

B] Should I be more concerned with the resulting breakdown of response speeds in the rest of the panel than with the Dram Frequency Score?

C] Is a command rate better with lower numbers followed by lower letters, and why do I see some people show a command rate ending in the letter "N" when more often than not mine end in a letter "T"?

D] Of the three groups of settings in the screenshots below, which would be the fastest?

Thank you, Rich

1600mhz RAM



1866mhz 1T CR



1866mhz 2T CR


Edited by wingclip - 7/4/13 at 10:44am
post #2 of 7
Couldn't find screen shots, hmmm.
Anyway, here's some examples;

DDR3 1600 9-9-9-24 1T will generally bench better than
DDR3 1866 11-11-11-28 2T or 1T.

DDR3 1866 9-9-9-24 1T will normally bench better than
DDR3 1600 9-9-9-24 1T.

You get the idea, a lower CAS number with similar speed RAM, like you're comparing, will normally bench better.

However,
DDR3 2133 11-11-11-28 1T or 2T will normally bench better than
DDR3 1600 9-9-9-24 1T.

BTW, none of this matters in everyday usage, LOL!
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post #3 of 7
Thread Starter 
Thanks but I had screwed up the post and you were too fast for me. Could you please go look at that again and then answer accordingly?
Rich
post #4 of 7
Thread Starter 
Quote:
Originally Posted by OS-Wiz View Post

Couldn't find screen shots, hmmm.
Anyway, here's some examples;

DDR3 1600 9-9-9-24 1T will generally bench better than
DDR3 1866 11-11-11-28 2T or 1T.

DDR3 1866 9-9-9-24 1T will normally bench better than
DDR3 1600 9-9-9-24 1T.

You get the idea, a lower CAS number with similar speed RAM, like you're comparing, will normally bench better.

However,
DDR3 2133 11-11-11-28 1T or 2T will normally bench better than
DDR3 1600 9-9-9-24 1T.

BTW, none of this matters in everyday usage, LOL!

Oh and, though the answer you gave me before seeing my screenshots was definitely helpful, answering those more specific questions based on the screenshots is what I'm really after. And I was aware the differences in speed between the two would likely be negligible, but then I don't know if that would be the case in my particular uses.

I'm a technical writer and I design the manuals I write as well. At any one time, I can have at least four memory intensive programs open and running. Programs like Dragon Naturally Speaking Premium 12, Photoshop CS 6 Extended, Adobe Acrobat XI Pro, Microsoft Office 2010 Pro, and at least four browser pages opened all simultaneously and that's not all of them.

In fact, I just upgraded my RAM from 8 GB of Corsair Vengeance Low Pro 1600mhz 2x4, to 16 GB Crucial Ballistix Tactical 1600mhz 2x8. I would've went the whole 32gb if I could have afforded it.

Anyway, if you happen to know the answers to those four questions, I would appreciate it if you take a moment to address them.
Thanks again, Rich
post #5 of 7
A] How important is the "Dram Frequency Score", (DFS), and is it better to be lower or higher in that score? Higher is better according to ASUS. See: http://rog.asus.com/117152012/maximus-v-motherboards/how-to-use-memtweakit/ However, see next response.

B] Should I be more concerned with the resulting breakdown of response speeds in the rest of the panel than with the Dram Frequency Score? I'd test with MaxxMem2 http://www.majorgeeks.com/files/details/maxxmem2.html with different DFS's. Sometimes lower latency will be better, other times mem speed will be better. If you have AIDA 64 it has the best memory benchmark right now.

C] Is a command rate better with lower numbers followed by lower letters, and why do I see some people show a command rate ending in the letter "N" when more often than not mine end in a letter "T"? Command Rate (CR) 1 is better than CR 2. Basically, there's no difference between the "N" and the "T". CR1 indicates the memory can be ready for the next fetch in one cycle, CR is 2 cycles. See: http://computer.howstuffworks.com/computer-memory.htm

D] Of the three groups of settings in the screenshots below, which would be the fastest? According to MemTweakit the one with the highest DFS: HOWEVER, its really unknown until you benchmark with MaxxMem2 or AIDA 64 mem bench or some other memory benchmarking software.

I'm a technical writer and I design the manuals I write as well. At any one time, I can have at least four memory intensive programs open and running. Programs like Dragon Naturally Speaking Premium 12, Photoshop CS 6 Extended, Adobe Acrobat XI Pro, Microsoft Office 2010 Pro, and at least four browser pages opened all simultaneously and that's not all of them. Do you have something like AIDA 64 that can measure memory in use so you can determine if you're out of memory and are paging out memory blocks to the swap file? It might turn out, due to running many apps at the same time, that 32GB of memory, even at a lower speed/DFS/bench score would be better.
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post #6 of 7
Thread Starter 
OUTSTANDING, OS-WIZ!!

I really appreciate it. I just got back in town and was able to address this. Your help has gone a long way and I feel a lot better about what I'm looking at. At this time, I have no RAM Benchmark software but I'm going to refer to your suggestions for some. I just want to do a few tests out of nothing but curiosity and see how things come together.

I can't say that I've experienced and lag, hesitation or unusual loading times in the programs I' typically have open since I went to 16GB. But I'm the kind of guy that likes to have some headroom and not run up againts the bumpers, sort of speak.

Thanks again, and you can count on the REP+.thumb.gif
Rich
post #7 of 7
Thanks for the REP+ -- glad I could help.
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The Money Trap
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