Ballistix Sport LT Overclocking

You can get a mix of timings that give a lower latency. I have settings for 3800CL16 and CL15. Both are 64, yet in the Ryzen dram calculator spreedsheet some guy has 62 with odd looking timings at 3800. Would really like to get latency down as much as possible. Most overclocked Intel systems have latency down under 45.

Anyway it takes really good binned ram to get the latency really low.
 
michty_me said:
I think this is the factor I didn't realise. I guess where I am now is not to be sniffed at really.
Click to expand...

Voltage helps but there is a point of diminishing returns.
I started out at 3600 16 16 16 36. The RAM kit was stable 1.35 volts @ 3800 with the same timings. This is 8-pack ram.

Every CL I drop, the performance increase is small. I can boot CL14 at 1.5 volts but can get tight timings at CL16 1.4 volts and CL15 1.45 volts.

Just don't want to kill anything. Appart from the RAM, everything is stock volts more or less. 1.45 volts won't jump to anything stupid with a multimeter measuring at the board I hope. Vcore is the same regardless of the RAM speed as far as I can tell. The ABBA BIOS is pushing a lot of volts vcore and boosting very high on water. Games are 4.424-4.474 and vcore is 1.4 volts for long periods.

Buildzoid states 1.5 volts maximum safe for IMC from AMD source https://youtu.be/zoXbHRR7j98?t=1601 (old video) https://youtu.be/T7ap8hRAKGM?t=677 (newer video uses 1.5 volts) and 8-pack states 1.5 volts for the 8-pack RAM. 1.5 volts is the maximum for xmp, https://www.hyperxgaming.com/en/memory/predator-ddr4 Predator DDR4 voltages maximum 1.5volts. Corsair 16GB Vengeance LPX 4600MHz DDR4 RAM/Memory Kit 2x 8GB is 1.5 volts as well.

“1.5v is the absolute max we allow for XMP certifications. However, good DDR4 memory will run at 1.35v up to 3200. Technically, no “safe” (guaranteed) OC over-voltage but 1.35v or lower is best.” – Intel
https://www.legitreviews.com/what-i...emory-overclocking_150115#kg1A3uPcZtL32ICp.99
  • 1.2V or lower = Best for DDR4
  • 1.35V = okay voltage for overclocking kits
  • 1.5V =absolute max voltage allowed for Intel XMP 2.0 profiles and max suggested voltage
AMD up to 1.5 volts DRAM. https://youtu.be/vZgpHTaQ10k?t=360
1.45 volts seems safer. 8-pack RAM is cool and feels a little warmish. I have lots of air flow over the RAM sticks as advised. 6 push/pull fans for the 360 rad.

Overclocking still is a risk, nice to have 8-pack and others help out with information. If things go wrong I won't be blaming 8-pack or Buildzoid to be sure. You have to be careful.

This is were RAM kits that don't have good timings start with have issues. It is all a matter of volts and what you will risk to do. Take the below forum posts.

DZCreeper
Boldly going nowhere with ambient cooling,2 points · 2 years ago
The voltage for RAM is independent of the voltage for the controller. You can push 2V through Samsung B-Die for instance and the RAM controller won't give a crap as long as itself is below 1.35V.

buildzoid
3 points · 2 years ago
depends on the CPU. Kaby/Sky IMC tolerate up to 2.1V on air and 2.2V on LN2. X99 and Ryzen I'm not sure. Intel kinda perfected bomb proof IMCs on DDR3 with people running Samsung HYK0 HCH9 and some other ICs on 1.9-2.2V on LGA 1150 without killing CPUs. Meanwhile AMD's FM2 IMCs died above 1.75V on the RAM.

https://www.reddit.com/r/overclocking/comments/66ugwa/a_ddr4_ram_question/

These RAM kits don't have samsung b-die timings but have good timings at 1.5volts-1.55volts. G.Skill RipjawsV 3200C16 for example.
https://phobosoc.wordpress.com/tag/ddr4/

Best RAM
8Gb B-die > 8Gb Micron Rev. E > 8Gb CJR > 4Gb E-die > 8Gb AFR > 4Gb D-die > 8Gb MFR > 4Gb S-die
1.2V is generally considered the upper limit of safe SoC voltages, particularly on Ryzen 3000CPUs.
https://www.corsair.com/corsairmedia/sys_master/productcontent/Ryzen3000_MemoryOverclockingGuide.pdf

Performance FPS
https://docs.google.com/spreadsheets/d/1uHdEavdBVH0c0LnWnwbUWDxC306YgnKir_W3ticgdYQ/edit#gid=0
Source https://www.overclock.net/forum/10-...zen-2-ram-scaling-how-does-compare-9900k.html

ABBA BIOS
no problem here, 3200C14 team dark 8 pack to 3800C16 rock solid
https://www.overclock.net/forum/10-...ected-your-ram-if-overclocking-results-2.html
 
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This is the specsheet for some of the 8Gb Micron dies, including Rev. E here: https://www.micron.com/-/media/clie...ducts/data-sheet/dram/ddr4/8gb_ddr4_sdram.pdf
You can find the various Rev. E speed grades in there, and the absolute maximum voltage rating. Basically keep these <1.5v and you should be fine, probably 1.45v as a max for 24/7 operation.
Speed grade wise the best dies seem to be the 083E ones, followed by 075E (you can check with Thaiphoon Buner, in the Part Number field). The 3000C15 Ballistix Sport DIMMs I got are all 075 (non-E), which is decent, seems 083E is going to Ballistix Elite/Tactical higher end kits.
 
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More added info, from what I gather some of the non Crucial kits that use Micron Rev. E dies are based on anything from 075, 075E and 093E, basically luck of the draw. Some of the Corsair 3600Mhz C18 kits are 075E, new Patriot Viper 3866Mhz kits are SpecTek packaged 093E (initial run was B-die).

PS: Thought the actual overclocking differences between all of the E-die speedgrades is probably nothing major.
 
michty_me said:
When you get a chance, can you elaborate a bit more? I assume you mean timings in Dram calculator?

Do you know which timings affect latency the greatest?
Click to expand...

Probably not stable, but managed to get down to 63.0 Latency!!
3600x @ 4.4Ghz
16-15-15

https://www.overclock.net/forum/attachment.php?attachmentid=300900&stc=1&thumb=1&d=1571201916

https://www.overclock.net/forum/13-...membench-0-8-dram-bench-589.html#post28160880



Okay so tried these setting myself but get 64ns in aida.
 
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Had this ram for months but finally got my ryzen 3000 system coming tomorrow, ive not tweaked ram since Haswell so basically I just want to set these to 3600 with the 3200 timings and be on my way for now and tighten later down the line. What volatages should I try, Is it literally just a voltage change in bios because I see all this talk of these fancy programs, are the actual tweaks still done in bios?.

Thanks
 
MegaPinches said:
Had this ram for months but finally got my ryzen 3000 system coming tomorrow, ive not tweaked ram since Haswell so basically I just want to set these to 3600 with the 3200 timings and be on my way for now and tighten later down the line. What volatages should I try, Is it literally just a voltage change in bios because I see all this talk of these fancy programs, are the actual tweaks still done in bios?.
Thanks
Click to expand...
I'd do it in bios

tamzzy said:
1) enable xmp/docp
2) set soc voltage to 1.1v
3) set memory voltage to 1.4v
4) set vtt to 0.7v
5) set memory multi to 36x
6) set infinity fabric to 1800
7) profit???

I left everything else at auto
Click to expand...
 
After some tinkering got some optimized timings for 3733Mhz C16 for E-die that should work on most E-die kits I feel:
tCL 16, tRCD(RD) 20, tRCD(WR) 20, tRP 16, tRAS 38, tRC 58
tRRDS 4, tRRDL, 6, tFAW 20, tWTRS 4, tWTRL 12, tWR 16, tRDRD SCL 4, tWRWR SCL 4, tRFC 560
tCWL 16, tRTP 12, tRDWR 8, tWRRD 2, tWRWR SC 1, tWRWR SD 6, tWRWR DD 6, tRDRD SC 1, tRDRD SD 4, tRDRD DD 4, tCKE 1 (or leave tCKE auto)
{tPage Auto, tRFC2 Auto, tRFC4 Auto}
ProcODT 40 Ohm, CMD2T 1T, GearDownMode Enabled, PowerDownMode Disabled
RTT, CAD Bus settings all on Auto
Voltages: 1.45v vDIMM (VTT should be half vDIMM, but on auto it's set to half anyway), 1.1v vSOC, 1.05v cLDO_VDDG, 1v cLDO_VDDP
Some of the voltages maybe be a bit generous, but if the above is stable with some extensive testing, then you can always try lower the voltages gradually (they're all still within safe ranges for everything though). Can also try tightening tFAW to 16 and tWR to 14 or 12.

They should give pretty good speeds for read/write/copy in AIDA, with latency of about ~68ns for 2x SR DIMMs or 70~71ns for 4x SR DIMMs.
 
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For an easy 3600Mhz C16 I went with:
tCL 16, tRCD(RD) 20, tRCD(WR) 20, tRP 16, tRAS 38, tRC 58
tRRDS 4, tRRDL, 6, tFAW 16, tWTRS 4, tWTRL 12, tWR 14, tRDRD SCL 4, tWRWR SCL 4, tRFC 540
tCWL 16, tRTP 12, tRDWR 8, tWRRD 2, tWRWR SC 1, tWRWR SD 6, tWRWR DD 6, tRDRD SC 1, tRDRD SD 4, tRDRD DD 4, tCKE 1 (or leave tCKE auto)
{tPage Auto, tRFC2 Auto, tRFC4 Auto}
ProcODT 40 Ohm, CMD2T 1T, GearDownMode Enabled, PowerDownMode Disabled
RTT, CAD Bus settings all on Auto
Voltages 1.4v VDIMM, 1.1v vSOC, 1.05v cLDO_VDDG, 0.9v cLDO_VDDP (just leave VDDP on auto)

I get ~71.5ns latency with 4x SR DIMMs, so 2x SR should get about 68~69ns.
 
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tamzzy said:
Wrong thread mate...b die thread is somewhere else :p
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Was another user in another forum, see the link. You re right its likely b-die.

This information could be of use to you all.

https://community.amd.com/community/gaming/blog/2017/05/25/community-update-4-lets-talk-dram

CLDO_VDDP

Voltage for the DDR4 PHY on the SoC. Somewhat counterintuitively, lowering VDDP can often be more beneficial for stability than raising CLDO_VDDP. Advanced overclockers should also know that altering CLDO_VDDP can move or resolve memory holes. Small changes to VDDP can have a big effect, and VDDP cannot not be set to a value greater than VDIMM-0.1V (not to exceed 1.05V). A cold reboot is required if you alter this voltage.
 
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