*Official* Intel DDR4 24/7 Memory Stability Thread - Page 784 - Overclock.net - An Overclocking Community
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*Official* Intel DDR4 24/7 Memory Stability Thread

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post #7831 of 12490 (permalink) Old 01-01-2019, 11:38 AM
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Quote: Originally Posted by Nephalem89 View Post
HI! @encrypted11 I have a problem... I have the same memories and the same plate that you... But I put the profile of Raja and it is impossible to use it always gives me blue screenshots all the time and I can not do OC to ram I'm using the latest version of the gene BIOS but not if it goes well thanks a lot!
MCH Full check disabled, MRC Fastboot disabled, Realtime Memory training disabled, try a manual toggle between maximus tweak mode 1 and 2.

Set a manual SA/IO voltage. Defaults are approximately 1.35V SA/IO at 4133MHz. Try VDIMM 1.45 before you begin optimising voltages and timing.

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post #7832 of 12490 (permalink) Old 01-01-2019, 11:55 AM
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Quote: Originally Posted by encrypted11 View Post
Quote: Originally Posted by Nephalem89 View Post
HI! @encrypted11 I have a problem... I have the same memories and the same plate that you... But I put the profile of Raja and it is impossible to use it always gives me blue screenshots all the time and I can not do OC to ram I'm using the latest version of the gene BIOS but not if it goes well thanks a lot!
MCH Full check disabled, MRC Fastboot disabled, Realtime Memory training disabled, try a manual toggle between maximus tweak mode 1 and 2.

Set a manual SA/IO voltage. Defaults are approximately 1.35V SA/IO at 4133MHz. Try VDIMM 1.45 before you begin optimising voltages and timing.
Thanks for you fast response one more question what is your bios version? Thanks and happy new year!
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post #7833 of 12490 (permalink) Old 01-01-2019, 01:25 PM
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Maybe this will be useful for someone, I rarely see 2x16GB here. Dual rank Samsung B-Die, two sticks from a retired X99 system (4x16GB F4-3200C14Q-64GTZSW (2016 Aug)). Decent results, voltages are conservative, but I'm out of time to experiment further.

Also, anyone else find AIDA64 to be inconsistent? Varies a lot from one boot to the next, especially latency (+/- 1 ns).
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post #7834 of 12490 (permalink) Old 01-01-2019, 02:43 PM
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Quote: Originally Posted by sdch View Post
Maybe this will be useful for someone, I rarely see 2x16GB here. Dual rank Samsung B-Die, two sticks from a retired X99 system (4x16GB F4-3200C14Q-64GTZSW (2016 Aug)). Decent results, voltages are conservative, but I'm out of time to experiment further.

Also, anyone else find AIDA64 to be inconsistent? Varies a lot from one boot to the next, especially latency (+/- 1 ns).
Pretty nice memory benchmark numbers. I'm curious which of the secondary timings you tweaked yourself vs. the BIOS set automatically? I'm working on optimizing a 16-16-16-35 4x8 G.Skill set at 4700 right now and trying to figure out which secondary timings will make a meaningful difference if I tweak them?
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post #7835 of 12490 (permalink) Old 01-01-2019, 04:47 PM
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Quote: Originally Posted by Nephalem89 View Post
Thanks for you fast response one more question what is your bios version? Thanks and happy new year!
0057 mirrored by [email protected] on hwbot. It's better in memory compared to the stable release that hasn't been updated for awhile.

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post #7836 of 12490 (permalink) Old 01-01-2019, 06:26 PM
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Intel Memory Overclocking Quick Reference

Quick Gains:
  1. Raise frequency, but not to the detriment of CL. Target a frequency/CL combination that makes sense for both transfer rate and latency.
  2. Lower CL (drives RTLs lower), and set tRCD/tRP accordingly.
  3. Lower CR if possible (drives RTLs lower), but not to the detriment of other timings.
  4. Lower tRFC.
  5. Lower tFAW (and tRRD_S with it, see below).
  6. Raise tREFI.
Then work on the other timings. Tight 2nd/3rd timings can have meaningful results.

Voltages:

Timings and "Rules":

Primary Timings:
  • CL: Start with a safe frequency/CL combination and adjust from there.
  • tRCD/tRP: Try 0-2 above CL (Samsung B-die) or 1-5 above CL (other ICs).
  • tRAS: CL + tRCD + tRTP (Source) or CL + tRCD + 2 (Source and Diagram). Min: 28. (Source: ASRock UEFI description)
  • CR: Try 1, otherwise leave at 2.

Secondary Timings:
  • tWR: Leave on Auto and control by tWRPRE until desired value reached. Manually set after that. (Raja: 16, Try: 9-16)
  • tRFC: Lower as much as possible. JEDEC default for 8Gb ICs: 0.350*XXXX/2 for DDR4-XXXX. (Raja: 350-360, Try: <=default)
  • tRRD_L: Min spacing is 6. (Raja: 6, Try: 6-8)
  • tRRD_S: Min spacing is 4. (Raja: 4, Try: 4-6)
  • tWTR: Min spacing is possibly 4. (Raja: 4, Try: 1-4)
  • tWTR_L: Leave on Auto and control by tWRRD_sg until desired value reached. Manually set after that. (Raja: 8, Try: 6-8)
  • tWTR_S: Leave on Auto and control by tWRRD_dg until desired value reached. Manually set after that. (Raja: 6, Try: 1-6)
  • tRTP: Min spacing is supposed to be 4, but this seems to actually be 6 with modern systems due to memory densities. (Raja: 8, Try: 6-8)
  • tFAW: Min is 4*tRRD_S. (Raja: 16-24, Try: 16-28)
  • tCWL/tWL: Set to 0-3 lower than CL. (Raja: tCWL = CL, Try: 9-16)

Third Timings:
  • tREFI: Raise as much as possible. JEDEC default: 7.8*XXXX/2 for DDR4-XXXX. (Raja: 11400-16667, Try: default, 2*default, or max it out)
  • tCKE: JEDEC sets this to 5-7. (Raja: 6-7, Try: Auto or 6-7)
For all the remaining third timings, I just start with Raja's values and adjust from there. Remember that tWTR_L/tWTR_S are controlled by tWRRD_sg/tWRRD_dg. Raja's values (and ranges to try in parenthesis):
  • tRDRD_sg: 6 (6-7)
  • tRDRD_dg: 4 (4)
  • tRDRD_dr: 6 (5-6)
  • tRDRD_dd: 6 (5-6)
  • tRDWR_sg: 15 (12-16)
  • tRDWR_dg: 15 (12-16)
  • tRDWR_dr: 16 (12-16)
  • tRDWR_dd: 16 (12-16)
  • tWRRD_sg: 35 (<35) (drives tWTR_L)
  • tWRRD_dg: 29-35 (<35) (drives tWTR_S)
  • tWRRD_dr: 8 (5-8)
  • tWRRD_dd: 8 (5-8)
  • tWRWR_sg: 6 (6-7)
  • tWRWR_dg: 4 (4)
  • tWRWR_dr: 8 (5-8)
  • tWRWR_dd: 8 (5-8)

Misc. Timings:
  • tWRPRE: 4 + tWR + tCWL. Min: 23, Max: 96. (Source) (Raja: 31)
  • tRC: tRAS + tRP. (only on some UEFIs, e.g. Gigabyte)

General:
Another trick is to see what the default/JEDEC timings are for DDR4-2133/DDR4-2400/DDR4-2666/etc. by setting everything to Auto (except frequency) and taking some notes. Many of the values end up being the same as the above and it gives insight to what can be adjusted further.

RTLs/IOLs:
RTLs/IOLs should align on their own, if not it's a training issue. If VDIMM/VCCIO/VCCSA adjustments don't help, you can also try the following, in order, one at a time:
  1. Manually set IOL Offsets, then save and reboot and inspect RTLs/IOLs
  2. Manually set IOLs, then save and reboot and inspect RTLs
  3. Manually set RTLs, and hope the system still boots
Remember, if you change memory frequency, CL, or CR, the RTLs change so you'd have to start these steps over from Auto.


Links:

Recommended Software:Other Software:Specifications:Guides:
edit: formatting and more details.

Last edited by sdch; 05-03-2019 at 06:31 PM.
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post #7837 of 12490 (permalink) Old 01-01-2019, 08:44 PM
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Quote: Originally Posted by sdch View Post
Maybe this will be useful for someone, I rarely see 2x16GB here. Dual rank Samsung B-Die, two sticks from a retired X99 system (4x16GB F4-3200C14Q-64GTZSW (2016 Aug)). Decent results, voltages are conservative, but I'm out of time to experiment further.

Also, anyone else find AIDA64 to be inconsistent? Varies a lot from one boot to the next, especially latency (+/- 1 ns).
That is some nice work on the manual timings. Definitely referencing this for future upgrade to 2x16GB.

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post #7838 of 12490 (permalink) Old 01-01-2019, 09:31 PM
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Quote: Originally Posted by sdch View Post
Intel Memory Overclocking Quick Reference
Thank you greatly for the summary. I've read this whole thread through, but not enough sunk in. Probably need to read it again now that will understand more. I've got four sticks of memory (4x8) rated at 17-17-17-37 and apparently, it simply won't go faster than 3733 at any voltage or timings, even with loose timings and 1.5V (I think partly because it's four sticks) so I'm working on optimizing it at 3733. It could also be that the IMC just can't go faster with four sticks. So far, I've gotten it to 16-16-16-34 at 3733, reduced tWR and reduced tRFC and am seeing meaningful improvements in AIDA64 memory benchmark numbers. Lots more timings to tweak. Thanks for the help and I can use your timings and a few others as an idea of things to try.

Last edited by jfriend00; 01-23-2019 at 08:31 PM.
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post #7839 of 12490 (permalink) Old 01-01-2019, 09:45 PM
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what is the formula for tREFI? how do we set that up? im assuming it has to do with the size of your ram 16gb, 32gb, 64gb?ive seen people with 32gb have it set to 60000+ and 16gb setup with 32000+ is it like a LoadLineCalibration?

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post #7840 of 12490 (permalink) Old 01-01-2019, 09:50 PM
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Do you guys typically retest your system stability after ensuring your ram alone is stable?

I'm asking because I was able to get my TridentZ RGB 4000mhz 17-17-17-37 1.35V to 4133mhz 16-17-17-37 at 1.45V. It did Ram Test through 18000%. It also did 8 hours of Realbench last night (but I only set it to use half the ram). I retested Prime95 1344K tonight to check a few unrelated things, with and without AVX, and both are failing a worker core due to rounding errors typically before 15 minutes is up, even though it was fine at the same settings just a few days ago. Resetting the ram to the XMP settings seems to have fixed it the issue. I'm not entirely sure the slight increase in speed/bandwidth really warrants the boost to 1.45V dram voltage though.

System Specs:

9700K 5.2ghz core 4.8ghz cache at 1.35V. Turbo LLC on the Aorus Master. IO/SA both at 1.25V

Last edited by Jidonsu; 01-01-2019 at 10:00 PM.
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