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*Official* Intel DDR4 24/7 Memory Stability Thread - Page 214

post #2131 of 5714
Quote:
Originally Posted by vibraslap View Post

Quote:
Originally Posted by stargate125645 View Post

unless you mean people bought faster kits and clocked them down for the better timings?

Exactly biggrin.gif
Well, that makes me feel a little better. I'll have to try 2T when I find the time to test again, which sadly may be a while.
Quote:
Originally Posted by sexpot View Post

When you say stock settings, did you bump your ram voltage up approximately 25mv to get 1T stable? That set should be 14-14-14-34-2T at 1.35V stock. To get 1T, you need to tweak ram voltage to about 1.37~1.38. VCCSA about .96 ~ 1.05
I had it at 1.42V for CL13 with 1T like was suggested by another user, but that wasn't good enough. The stock timings were used with only 1.35V, but that was at 1T so I'll have to try it at 2T.
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post #2132 of 5714
Quote:
Originally Posted by vibraslap View Post

Exactly biggrin.gif

FWIW, the actual chips in these DIMM's are rated at 2133 by the actual manufacturer(Samsung), and then they are binned by G-skill and sold at whatever speed they could get reliably stable.

But, in the end, the performance index (MHz / CL) is pretty similar across all the high-end kits, right? Nobody's selling 3600MHz @ CL13, I mean, haha. Or, are you saying, DRAM binned at a higher frequency will be able to run lower & tighter than a chip binned at the lower frequency? OK, wait, that makes sense.

All the sticks are sold at 1.35V; they reach their binned frequencies at that voltage. So, a chip that can do 3733 @ 1.35V is obviously better binned than a chip that can 3200 @ 1.35V, even if we ignore the timings.


Regarding CR1/2 (1T/2T), I found this article (but it's on DDR3 on AMD IMC): apparently, CL & CR & tRFC & tREF have the largest impacts, about 1% each.



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post #2133 of 5714
Quote:
Originally Posted by ikjadoon View Post


Regarding CR1/2 (1T/2T), I found this article (but it's on DDR3 on AMD IMC): apparently, CL & CR & tRFC & tREF have the largest impacts, about 1% each.
Thank you. I would suspect that is difference is reduced further for DDR4 since it operates significantly faster than DDR3, but I obviously don't have any tests to back that up.
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post #2134 of 5714
Quote:
Originally Posted by Praz View Post

Hello

I purchase the kits and then tune as needed. Seems that method is not for everyone though.

Praz, you once mentioned "tuning" vs. "timing tweaking". I was wondering if you could elaborate on the two approaches for at least my enlightenment, though probably others could benefit too smile.gif.
post #2135 of 5714
Well, I stayed up late to test the RAM with a 2T command rate and 1.35V. No go, still get errors. So now is my kit bad such that I should file for replacement from G.Skill? Or perhaps I should test with a lower cache frequency? I went all the way down to 3.8GHz and still got errors.

Edit: Stock settings with a higher voltage also didn't work.
Edited by stargate125645 - 7/19/16 at 10:18pm
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post #2136 of 5714
Quote:
Originally Posted by Silent Scone View Post

Large majority of kits on the market are binned at 2T, as per what is specified on the serial label and packaging

I think mine was binned at 4T with 2T being an overclock. redface.gif
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post #2137 of 5714
Quote:
Originally Posted by Jpmboy View Post

I think mine was binned at 4T with 2T being an overclock. redface.gif
4T? What sort of madness is that? I would challenge them to a duel.
post #2138 of 5714
Quote:
Originally Posted by stargate125645 View Post

Well, I stayed up late to test the RAM with a 2T command rate and 1.35V. No go, still get errors. So now is my kit bad such that I should file for replacement from G.Skill? Or perhaps I should test with a lower cache frequency? I went all the way down to 3.8GHz and still got errors.

Edit: Stock settings with a higher voltage also didn't work.

I had to set DRAM voltage to 1.45 to get it without errors on HCI memtest at 3200 MHz. Even 0.01 lower would cause errors.
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post #2139 of 5714
Quote:
Originally Posted by greg1184 View Post

Quote:
Originally Posted by stargate125645 View Post

Well, I stayed up late to test the RAM with a 2T command rate and 1.35V. No go, still get errors. So now is my kit bad such that I should file for replacement from G.Skill? Or perhaps I should test with a lower cache frequency? I went all the way down to 3.8GHz and still got errors.

Edit: Stock settings with a higher voltage also didn't work.

I had to set DRAM voltage to 1.45 to get it without errors on HCI memtest at 3200 MHz. Even 0.01 lower would cause errors.
Seems to me the RAM is not operating at its stated specifications, then, like mine.
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post #2140 of 5714
Quote:
Originally Posted by Jpmboy View Post

I think mine was binned at 4T with 2T being an overclock. redface.gif
4T? What sort of madness is that... I would challenge them to a duel.
Quote:
Originally Posted by stargate125645 View Post

Seems to me the RAM is not operating at its stated specifications, then, like mine.
Takes 2 to tango, compensating for the HWE IMC's limitations at these speeds is the norm.
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