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AlbinoRhino View Drop Down
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    Posted: 15 Jul 2017 at 12:48am
Here's an interesting read on when Single Rank is better than Dual Rank, when Gear Down Mode should/shouldn't be enabled, and Tighter lower timings vs looser higher timings:

https://community.amd.com/community/gaming/blog/2017/07/14/memory-oc-showdown-frequency-vs-memory-timings
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wardog View Drop Down
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Finally. What I have been preaching here.

Quote

The ancient debate: frequency or timings?

 

Last, but not least, Sami set out to find whether it was tighter timings or higher clockspeeds that mattered most on the AMD Ryzen??processor. Sami pushed this combination of hardware up to DDR4-3520, DDR4-3466 with tighter timings, and DDR4-3200 with the tightest timings that could be achieved while maintaining stability with Memtest.

 

The verdict: tighter timings won. DDR4-3200 with aggressive timing adjustments outperformed the looser timings needed to hit DDR4-3520, while 3466 clearly split the difference with the right balance of timings and frequency.

...................

............

Conclusion #3: Chasing the highest possible clockspeed required timings so relaxed that real world performance suffered versus lower frequencies with tighter timings. This is a fine balance, however, so testing on your platform is always helpful.



Edited by wardog - 15 Jul 2017 at 2:45am
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AlbinoRhino View Drop Down
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Originally posted by wardog wardog wrote:

[URL=][/URL]Finally. What I have been preaching here.

Quote
<h1>The ancient debate: frequency or timings?</h1><p style="min-height: 8pt; padding: 0px;">?

Last,
but not least, Sami set out to find whether it was tighter timings or
higher clockspeeds that mattered most on the AMD Ryzen??processor. Sami
pushed this combination of hardware up to DDR4-3520, DDR4-3466 with
tighter timings, and DDR4-3200 with the tightest timings that could be
achieved while maintaining stability with Memtest.

<p style="min-height: 8pt; padding: 0px;">?

The
verdict: tighter timings won. DDR4-3200 with aggressive timing
adjustments outperformed the looser timings needed to hit DDR4-3520,
while 3466 clearly split the difference with the right balance of
timings and frequency.

...................

............

Conclusion #3: Chasing the highest possible clockspeed
required timings so relaxed that real world performance suffered versus
lower frequencies with tighter timings. This is a fine balance, however,
so testing on your platform is always helpful.




This is why I won't compromise my timings at higher clock speeds. I'd rather have tighter timings at a lower clock than loose timings at a higher clock. Now if I could find some literature on PROC Ohms I'd be happy. How high is reasonable on Ram Ohms?
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wardog View Drop Down
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There will be no "reasonable' value.

procODT is derived from many variables(mem to CPU traces, CPU, Memory, "noise' levels over traces, voltages etc) and thus EACH Users computer will be different.

Consider procODT to be a tolerance level, in laymans terms.

Two old skool, and now outdated with the settings/options, for reference ONLY.

http://www.bit-tech.net/reviews/tech/memory/the_secrets_of_pc_memory_part_3/8/

http://archive.techarp.com/showFreeBOG9847.html?lang=0


Those two pages have great background/info on procODT. But again, since both are rather dated now, the #'s themselves are ....... not up to date. Fortunately, their desc of the function IS applicable to today.


HTH
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Drain_Bamaged View Drop Down
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A adjustment to procODT was absolutely necessary for my RAM.
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AlbinoRhino View Drop Down
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Originally posted by Drain_Bamaged Drain_Bamaged wrote:

<span style=": rgb43, 43, 43;">A adjustment to procODT was absolutely necessary for my RAM.</span>


Yeah I'm at 53.3 Ohms@3066MHz, but am looking for a ballpark Ohm for 3200MHz.

I have no idea how high you can go with it still being considered safe. I tried 60 Ohms for 3200, but haven't tried higher.

At 2933 I was at 48 Ohms.
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