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*Official* Intel DDR4 24/7 Memory Stability Thread - Page 181

post #1801 of 5605
Quote:
Originally Posted by Silent Scone View Post

Nice chip! No but I can lend you a DVD to install Linux distro tongue.gif

Lol! Might try one of these days. wink.gif
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post #1802 of 5605
Quote:
Originally Posted by skmanu View Post

Would you be kind enough to lend me your shredder?
I have a very nice Aurora shredder. E-mail me anything you want shredded and I'll be happy to take care of it for you biggrin.gif

Nice chip BTW thumb.gif
post #1803 of 5605
Thanks!
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post #1804 of 5605
Quote:
Originally Posted by Silent Scone View Post

Thanks again GRABibus smile.gif. You're scrutinous with your coverage

Yep, 12 hours OCCT and 12 hours HCI Memtest are my validation overclock rules wink.gif
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post #1805 of 5605
Thread Starter 
Honestly 1 to 2 hours of GSAT is sufficient!
post #1806 of 5605
Quote:
Originally Posted by Raja@ASUS View Post

Anyone that understands memory should never talk about timings as if they are a separate entity to frequency.
I think you are misinterpreting my statement and I was admittedly vague...

We have to consider frequency, cycle counts and voltage not independently or even linearly related but as a matrix solution to the problem.

Using the absolute time of ((1/freq) * #cycles) as a "guideline" for what the DIMM/Kit can do, but not an absolute. The lousy cooling DIMMs get alone adds another huge fudge factor as you push the envelope here. The manufacturer bins according to meeting some threshold they believe they can price at any given time relative to overall order book needs. They only care that it can do what they say it can do. If it could do more or more with slightly more than 1.35v, then you _might_ get that for free or you might get nothing more than promised.

I was speaking both about my current kit(s) and their scaling as well as future kits that might provide improved ratio of clock:CAS. There are now 3200CAS14 kits where 3000CAS14 was as good as I could do when I bought my 128G kit. Even worse is the 2800CAS15 32G kit I have in another machine or a 3000/15 kit in still another. Bigger kits empirically and logically put more strain on the IMC and thus a given kit might have better characteristics as individual or fewer than included dimms than they do as a kit (I've seen this repeatedly).

Then there is the matter that the CPU/IMC were designed with various assumptions and sweet-spots of frequency of each component (CPU, Cache, DDR) which affect their fifo depths, settings and pipe-line depth assumptions. These are ratios to which we have little to no information other than empirical. BIOS writers have some and Intel even more about this, but to us lowly users its a black box.

Of course they are not independent. When I raise frequency, I should expect any given timing to be more at risk of violating my sample's requirements than they would at a lower frequency because I am asking the DRAM's internal components to do the work of address, refresh, charge, discharge, etc... in less absolute time ((1/freq) * #cycles)).

For those playing the home game:
14cycles @ 3000 (1500) => 0.00000000933338 or 9.33nS
12cycles @ 2800 (1400) => 0.00000000857148 or 8.57nS

So, I sped up memory frequency by ~7%, but now the Column Address Strobe sequence takes ~8% LONGER in absolute time.

Let's go even more ridiculous and look at a 4266/19 kit on the `egg:
19cycles @ 4266MHz (2133) => 0.00000000890758 or 8.91nS

Which one will produce the best overall system performance? Dr WaitState decides... ;-) (well he and the IMC's ability to gang together page reads and writes and some large number of other factors that are chip architecture, OS architecture and even application dependent).

So, put all that together and the "best" performance of your system that is possible may very well not be the highest clock rate your IMC/DIMM will tolerate, so I will reserve my hunger for 4GHz memory until or unless I see that they can actually improve my system performance or prices make it a moot point.
Edited by cekim - 7/4/16 at 4:57pm
post #1807 of 5605
Quote:
Originally Posted by skmanu View Post

Thanks! Warning: Spoiler! (Click to show)

That's the one - works like magic! biggrin.gif
post #1808 of 5605
Quote:
Originally Posted by Silent Scone View Post

Honestly 1 to 2 hours of GSAT is sufficient!

tongue.gif
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MICROSOFT Windows 10 Professional 64-bit ASUS ROG Swift PG278Q LOGITECH G810 Orion Spectrum COOLER MASTER Silent Pro M2 1000W 
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ANTEC Nine Hundred Two V3 (Opened side panel) LOGITECH G402 Hyperion Fury RAZER Goliathus Control (Small) SOUND CARD REALTEK ALC1150 on-board 
AudioAudioOtherOther
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post #1809 of 5605
Quote:
Originally Posted by cekim View Post

So, put all that together and the "best" performance of your system that is possible may very well not be the highest clock rate your IMC/DIMM will tolerate

Hello

This has always been the case so nothing new here.
post #1810 of 5605
Quote:
Originally Posted by Praz View Post

Hello

This has always been the case so nothing new here.
Which is why I didn't bother elaborating in the first place...
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