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AMD DDR5 OC And 24/7 Daily Memory Stability Thread

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#14,941 ·
ItsaJoke said:
Is there a model you can recommend?
Click to expand...
Corsair models with a Z in the name in stead of a C. So 6000Z30 for example. Those are EXPO specific kits. So far the Dominator Titanium's seem quite strong and have unlocked PMIC. Not all vengeance models have unlocked PMIC tho.
 
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#14,942 ·
Imprezzion said:
Not all vengeance models have unlocked PMIC tho.
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Tell me about it my first RAM kit(vengeance) was A-die with a locked PMIC. Would have saved me buying two more kits if it was unlocked. Second set was M-die and then finally the third I decided to buy a higher speed kit to get a A-die. Previous two were 6400MHz.
 
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#14,943 ·
ZhenyaUsenko said:
Here you can find some statistics on the data line impedance (and other lines as well). No motherboard names though
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Thanks for sharing, appreciate your willingness!. I tried 48 and no boot, stuck on code 00, same for 60, boots fine at 240 only. So not the culprit, will play around with other terminations and see what transpires. For my own knowledge 2x32GB kit only worked with RttWR at 240, this is my second 64GB kit. previous was a 6000CL32, that kit also liked 240.

FYI, i'm running 6400 CL26 36 in Kahru now, bandwidth not great but will tighten up timings once I get a good baseline. Will add ZT screenshot later, on my laptop now, will let that simmer for 10 mins or so.

Edit;

Font Screenshot Software Technology Terrestrial plant
 
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#14,944 ·
99belle99 said:
Tell me about it my first RAM kit(vengeance) was A-die with a locked PMIC. Would have saved me buying two more kits if it was unlocked. Second set was M-die and then finally the third I decided to buy a higher speed kit to get a A-die. Previous two were 6400MHz.
Click to expand...
For Corsair, I would buy used. Corsair puts version number on the dimm. If the list has the actually picture of the dimm, you will know what you get.
 
#14,945 ·
lostking said:
For Corsair, I would buy used. Corsair puts version number on the dimm. If the list has the actually picture of the dimm, you will know what you get.
Click to expand...
Doesn't matter now as I have an A-die kit but as I said in this thread already the M-die 6400MHz kit out performs my A-die at the same timings and speed at 6400 but with tighter tRFC in 2.5b ycruncher.
 
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#14,947 ·
BOBKOC said:
& for 8000@101 or+;)
View attachment 2649655 View attachment 2649654
View attachment 2649656
Click to expand...
Is it safe running 102.5 bclk? I tried eclk but the memory clock doesn't go up in eclk so it has to be bclk. Also my zen timings memory clocks do not go up with 102.5 bclk like yours they are still at 8000MHz but if I go into hwinfo it shows the increased speed. One thing I was on Facebook and with chrome broswer and it crashed just the Facebook page that never happened before. I'm wondering if that was because of the bclk overclock. I will continue monitoring it just to be sure.

I also got my best ever latency with this bclk overclock:

Font Electronic device Software Number Multimedia
 
#14,948 ·
Imprezzion said:
Corsair models with a Z in the name in stead of a C. So 6000Z30 for example. Those are EXPO specific kits. So far the Dominator Titanium's seem quite strong and have unlocked PMIC. Not all vengeance models have unlocked PMIC tho.
Click to expand...
For all corsair memory models which have X before the speed bin (e.g. CMK32GX5M2X7600C36) has the unlocked PMIC. C is XMP and Z is EXPO.
Mine has B (CMK32GX5M2B6000Z30), so I'm stuck at 1.43v

Edit: there's also this
 
#14,949 ·
BOBKOC said:
On top of that
by Spaik View attachment 2649732
Click to expand...
Cool, welldone!.

I'm don't bclk, pure OC, 6400, CL26, 36 GDM enabled like you and running like a champ in Kahru, at 303mbs. 52,7 latency with mild CO, once test completed will get it down in the 51's latency.

35 mins into karhu ram temps maxed out at 38 deg c
 
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#14,950 · (Edited)
ADHE said:
One question regarding the trc topic....
In all my profiles i always set TRC = TRP+TRAS, but i never tried lowering TRC below the number of the formula...
I saw not so long ago a post from @mrcardio33x@gmail.com regarding the trc topic but i never tried it myself. Did you see any performance increase after lowering it further than the formula?
Also TRRDS and TRRDL dont have any impact in 1:2 mode if im not mistaken, i can set 4/4/16 , 6/6/24 , 8/8/32 without any scaling 😅
Click to expand...
Tested:

6200MT/s CL28 36 32 30 / 2200 FCLK @ tRC: 34 v. tRC = tRP + tRAS: 62
Nitro: 1 2 0 X8 X8

CPU: BCLK 105 - LLC7 - PBO Scaler X6 - Boost Clock (-) 150 MHz or 5150MHz

PYPrime: Best of X10
Not aware of any other benchmark more sensitive than PYPrime.
Font Screenshot Technology Multimedia Software

Font Screenshot Software Computer Technology
 
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#14,951 ·
Melan said:
For all corsair memory models which have X before the speed bin (e.g. CMK32GX5M2X7600C36) has the unlocked PMIC. C is XMP and Z is EXPO.
Mine has B (CMK32GX5M2B6000Z30), so I'm stuck at 1.43v

Edit: there's also this
Click to expand...
Not entirely true even tho Corsair claims that.

My SKU is CMP32GX5M2B6000Z30 so has a B but it is fully unlocked. I run 1.620v on it so..
 
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#14,953 ·
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#14,954 ·
mrcardio33x@gmail.com said:
Tested:

6200MT/s CL28 36 32 30 / 2200 FCLK @ tRC: 34 v. tRC = tRP + tRAS: 62
Nitro: 1 2 0 X8 X8

CPU: BCLK 105 - LLC7 - PBO Scaler X6 - Boost Clock (-) 150 MHz or 5150MHz

PYPrime: Best of X10
Not aware of any other benchmark more sensitive than PYPrime.
View attachment 2649739
Click to expand...
Did you ever try 2167IF just to see if you get better latency? Or is the 2200IF better? My CPU cannot do 2200MHz so you are lucky with your chip.
 
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#14,957 ·
99belle99 said:
Did you ever try 2167IF just to see if you get better latency? Or is the 2200IF better? My CPU cannot do 2200MHz so you are lucky with your chip.
Click to expand...
Yeah tried 2167, it's a tad worse.
My chip seems good with FCLK but not so good past 6200MT/s.
 
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#14,958 ·
mrcardio33x@gmail.com said:
Yeah tried 2167, it's a tad worse.
My chip seems good with FCLK but not so good past 6200MT/s.
Click to expand...
Doesn't seem to matter though as you seem to have it dialled in are getting good performance at 6200MHz.
 
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