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Well I wouldn't run tRAS and tRC that low. I'd run it at 34 and 50 and then lower tRFC at 250.
Going as low as possible is really nice. :)


You do need to sync everything though.
 
Well I wouldn't run tRAS and tRC that low. I'd run it at 34 and 50 and then lower tRFC at 250.
Isnt there a rule where tRFC should be a multiple of tWR and tRTP? Should i change tWR/tRTP?
 
Isnt there a rule where tRFC should be a multiple of tWR and tRTP? Should i change tWR/tRTP?
I couldn't say. I've seen folks use multiples of tRC though.

My current timings don't base tRFC off of tRC and it proved stable last night so I'm really not sure.
 
Hmmm, thanks for the link. Not sure if i get it but it seems i should run CL=14 and tRC=44 for tRFC=264....CL16 and tRC=48 should use tRFC=288?...but i can use tRFC 264 with CL16 and tRC=48 and it also gives me better benchmark results. Am i missing something?
It's a matter of sync. :)

If you're not using optimal subtimings, the motherboard will autocorrect.
 
Just upgraded to a 3900x from a segfault bugged 1700.

Image



My 1700 couldn't reliably do over 3400-3466MHz, no matter if using 2x8GB quality B-die or these same 4x16GB Rev. E sticks. This 3900x makes short work of them, and works wonderfully in the same C6H. 64GB, quad rank, 1900MHz fabric, 3800MHz memory, lowest procODT, low voltages overall.

I can run 1900MHz fabric on 0.8v VDDG and pass stress tests, but then I get audio crackling/cutouts, so it's not really stable.

tRCDRD 18 @ 3800MHz hangs half way into Windows' loading screen... So, settled on 19 (clean 10ns @ 3800MHz) and 16 for the rest of the primaries, and the rest of the timings have all been manually calculated from @Veii 's knowledge. Extremely helpful posts.


No doubt Rev. E is light on the memory controller.
 
hey guys i am back with some new issues :(

Ive been running with these timings 2x8gb gskill flarex for a couple of months and decided to buy another set of the same ram to make it 4x8gb and im finding it difficult to get them to run at these or any higher timings. ive tried running only the new kits by themselves and it works but 4x8 setup is a no go. any advice? ive tried playing around with different procodt and cad bus timings but doesnt seem to fix it.

2x8gb voltages are

dram - 1.5
vddg - .95
vddp - .9
vsoc 1.088
proc odt 34
cad bus 40-20-20-24


any advice would be much appreciated @rares495 @KedarWolf @Veii
 

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Just upgraded to a 3900x from a segfault bugged 1700.

Image



My 1700 couldn't reliably do over 3400-3466MHz, no matter if using 2x8GB quality B-die or these same 4x16GB Rev. E sticks. This 3900x makes short work of them, and works wonderfully in the same C6H. 64GB, quad rank, 1900MHz fabric, 3800MHz memory, lowest procODT, low voltages overall.

I can run 1900MHz fabric on 0.8v VDDG and pass stress tests, but then I get audio crackling/cutouts, so it's not really stable.

tRCDRD 18 @ 3800MHz hangs half way into Windows' loading screen... So, settled on 19 (clean 10ns @ 3800MHz) and 16 for the rest of the primaries, and the rest of the timings have all been manually calculated from Veii's knowledge. Extremely helpful posts.


No doubt Rev. E is light on the memory controller.
You just have to increase VDDG to get rid of the audio crackle. :)
 
Just upgraded to a 3900x from a segfault bugged 1700.

Image



My 1700 couldn't reliably do over 3400-3466MHz, no matter if using 2x8GB quality B-die or these same 4x16GB Rev. E sticks. This 3900x makes short work of them, and works wonderfully in the same C6H. 64GB, quad rank, 1900MHz fabric, 3800MHz memory, lowest procODT, low voltages overall.

I can run 1900MHz fabric on 0.8v VDDG and pass stress tests, but then I get audio crackling/cutouts, so it's not really stable.

tRCDRD 18 @ 3800MHz hangs half way into Windows' loading screen... So, settled on 19 (clean 10ns @ 3800MHz) and 16 for the rest of the primaries, and the rest of the timings have all been manually calculated from Veii's knowledge. Extremely helpful posts.


No doubt Rev. E is light on the memory controller.

I think GDM rounds up odd trcdrd timings, or it seems to on mine so you might be running trcdrd20. On my Rev E 2 x 16gb kit if I lower Tfaw below 28 the Dram calculator benchmark gets slower, have you benchmarked Tfaw 16 vs higher numbers like 20-24?
 
hey guys i am back with some new issues :(

Ive been running with these timings 2x8gb gskill flarex for a couple of months and decided to buy another set of the same ram to make it 4x8gb and im finding it difficult to get them to run at these or any higher timings. ive tried running only the new kits by themselves and it works but 4x8 setup is a no go. any advice? ive tried playing around with different procodt and cad bus timings but doesnt seem to fix it.

2x8gb voltages are

dram - 1.5
vddg - .95
vddp - .9
vsoc 1.088
proc odt 34
cad bus 40-20-20-24


any advice would be much appreciated @rares495 @KedarWolf @Veii
4x8 = hard to run; you give up overclocking potential for capacity

Try cad_bus 60-20-20-24 and procODT 60-80 ohm.
 
I have no crackle at 0.9v, as shown in the picture with all my settings.

I was just amazed to see 1900MHz work at only 0.8v :D My 3900x must have a nice I/O die.


On the other hand, my friend's 3950x crackles at 1900MHz and ~1.05v VDDG, 1.1v vSOC... F for him
Yeah, the 12&16 core chips could always do 1900 easily. Even my old 3700X did it on auto VDDG. This 3600 needs 1.15V SOC and 1.1V VDDG to stop the crackle. :)
 
4x8 = hard to run; you give up overclocking potential for capacity

Try cad_bus 60-20-20-24 and procODT 60-80 ohm.
I tried that and no go. I cant even run this at 3200mhz tight ram timings using ryzen calc. Only works with xmp cl14. And the system gets stuck sometimes when I try to get into bios as well. What in the world is going on :/
 
4 Dimms depends a lot more on getting good contact between the cpu pins and the motherboard. Once I lost dual channel because I was moving my fan around on the cpu heatsink and when I gently pressed the heatsink into the motherboard so the pressure was even across the cpu pins it fixed it and also allowed me to run 1t GDM off at up to 3800mhz..for a few days. Eventually it went back to only being able to run GDM disabled at up to 3200mhz but it helped for a while.

I can see why threadripper with so many memory channels and RAM slots has a really sophisticated locking mechanism to ensure the cpu pins make good contact.
 
I tried that and no go. I cant even run this at 3200mhz tight ram timings using ryzen calc. Only works with xmp cl14. And the system gets stuck sometimes when I try to get into bios as well. What in the world is going on :/
Dude,

grab some coffee, get google and start researching.

Nothing is "going on".

Its well know if you at least did a bit of research that 4 x 8GB is alot more difficult to run at similar timings/frequency than 2 x 8GB.

Only a quick look in this thread and you will see others have attempted this and have received some assistance from others

:p :p

It should be nothing of a suprise if you read a bit first!

FYI

ProcODT: 40 ohms/6
RTTNOM: 34 ohms/7
RTTWR: 80 ohms/3
RTTPARK: 240 ohms/1

ClkDrv: 24
AddrCmdDrv: 20
CsOdtDrv: 30
CkeDrv: 24

You also have to play with DRAM voltage, vSOC with the above settings religiously just to get it to post at higher frequencies.

The maximum I could reliably post at was 3666/1833 but forget TM5 stability and I spent a good 48 hours reading, researching, testing, documenting to get this far.

Ofcourse, it also depends on your motherboard, if you had spent 5 minutes checking you would have known this.

I was doing this on my x370, which is a challange in itself.

If you are on x570 you have a better chance of getting somthing similar to your 2 x 8GB clocks.

But please, again, nothing is "going on" ............
 
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Dude,

grab some coffee, get google and start researching.

But please, again, nothing is "going on" ............
Mate, I posted my issues after doing research and playing around with timings. That's why i went back to see what happens when i try to tighten my timings at 3200 instead of overclocking after "rares" suggestion didnt work.

I will try your timings and will post back with my findings. Thanks for suggesting those to me. Much appreciated :)
 
Mate, I posted my issues after doing research and playing around with timings. That's why i went back to see what happens when i try to tighten my timings at 3200 instead of overclocking after "rares" suggestion didnt work.

I will try your timings and will post back with my findings. Thanks for suggesting those to me. Much appreciated :)
What motherboard are you on?

That will tell us if it is T-Topology or Daisy Chain topology.

For me, timings were not the issue, I could try 22-22-22-22 etc it didnt make a difference.

Its all in playing with the settings I posted, learning what your motherboard/ram combination react to and taking it from there .

Good luck!
 
What motherboard are you on?
That will tell us if it is T-Topology or Daisy Chain topology.

For me, timings were not the issue, I could try 22-22-22-22 etc it didnt make a difference.

Its all in playing with the settings I posted, learning what your motherboard/ram combination react to and taking it from there .

Good luck!
It's c8h hero wifi, which I believe is Daisy chained. Also do you follow dram 1.73 or 1.62? Because I just noticed that bgs is enabled and bgs alt disabled in 1.62 for 4 dimms and it's the other way arlund( which is what thought should be normally) in 1.73.
 
It's c8h hero wifi, which I believe is Daisy chained. Also do you follow dram 1.73 or 1.62? Because I just noticed that bgs is enabled and bgs alt disabled in 1.62 for 4 dimms and it's the other way arlund( which is what thought should be normally) in 1.73.
That wont make a difference regards the issue.

Its about finding the right combination.

And it helps immensly if the kits are matched, as in, sold matched.

Buying two identical 2 x 8GB kits is not the same as buying a kit that has been matched/sold as 4 x 8GB.

Be prepared to invest a substantial amount of time to get them to work, you have a good motherboard at least for getting there!

https://docs.google.com/spreadsheet...spreadsheets/d/1wmsTYK9Z3-jUX5LGRoFnsZYZiW1pfiDZnKCjaXyzd1o/edit#gid=2112472504

I started here
 
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