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*Official* Intel DDR5 OC and 24/7 daily Memory Stability Thread

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#1,917 ·
#1,939 ·
Spock-_- said:
Well in my effort to keep pushing my Gskill Samsung kits I finally (as a complete memory OC'ing noob) bricked my Windows OS last night. An unstable timing that was good enough to boot into, boot looped on me before i could catch it after I walked away while benchmarking, and it caused errors during a "Windows Startup Recovery" completely destroying the OS.

Last stable, with running TM5 without errors I was able to do was 6200Mhz CL30, subs at 34-34-64

It was during testing @ 6400mhz with same timings I ran into the problem.

So that's frustrating. But part of the game, and learned some lessons on what not to do 😅 (gotta remind myself to disable windows auto repair tonight)

One positive though, I was actually having functioning results above 6000mhz, instead of just no boot what-so-ever.
Click to expand...
I always have at least 5 or 10 macrium backups...
Never had to reinstall Windows after this procedure.
 
#1,942 · (Edited)
Spock-_- said:
I had never heard of this software before. Thanks for the heads up. I will certainly look into this tonight.
Click to expand...
It's free and works very well...

I dont know how it do its magic... But it takes a snapshot of the disk with the system running... and when you restore the image, all is perfect.

My life changed after start using it... LOLOL

www.macrium.com

Macrium Reflect 8 - What's New

Known for creating reliable and scalable software that exceeds personal and business needs. Reflect 8 was created with you, and the future, in mind.
www.macrium.com www.macrium.com





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#2,097 · (Edited)
Hy guys...
I need some help...
I'm running XMP and I'd like to understand where to make changes and have better results.
Do you know if I can find some reading about it?
Or if some of you have some time to explain to me the basics
EDITED: I started reading this thread form page 1... LOL
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#2,100 · (Edited)
Arni90 said:
There's this guide: MemTestHelper/DDR4 OC Guide.md at oc-guide · integralfx/MemTestHelper
While it's written for DDR4, and the specific timing recommendations don't really apply, the principle and order of tightening timings remains the same (lower one timing at a time, test stability, rinse and repeat)

Here's what's changed in terms of DDR5 OC on Intel CPUs:
  • tCL needs to be a multiple of the gear ratio, in gear 2 that means it has to be an even number, while gear 4 means it needs to be a multiple of 4
  • tRCD and tRP are now separate timings
  • tREFI can now run as high as 262143, this is the only timing where higher = better.
  • Tertiary timings for Intel on DDR5 are now at minimum 7, rather than 4.
  • Due to the increased number of banks on DDR5, _dg timings have a significant impact on performance, _sg timings doesn't make the same kind of difference.
  • tRFCpb / tRFCsb is a new timing, which refreshes a single bank, this allows the CPU to still access memory while data is being refreshed. Tightening it works similarly to tRFC.
  • Some testmem5 presets work better than others, ironically enough I've found 1usmus_v3 to work quite well.
  • tWR is controlled by tWRPRE and tWRPDEN, if you want a formula: tWR = tWRPDEN - (tCWL + 8)
  • tWTR_S and tWTR_L are controlled by tWRRD_dg and tWRRD_sg respectively. tWRRD_dg and _sg can have a significant impact on performance, and they can often only tighten 2-6 ticks from stock timings.

For the Hynix ICs you're using, here are my suggestions as a starting point:
VDD/VDDQ: 1.35V
tCL 11 ns
tRCD 13 ns
tRP 13 ns
tRAS 13 ns
tRFC 130 ns
tRFCpb 90 ns

Note that I listed these values in terms of absolute time, and you'll have to multiply them by the actual frequency to get a suggested timing.

Example: tCL at DDR5-5600
DDR5-5600 has an actual frequency of 2.8 GHz
tCL is suggested 11 ns

tCL in ticks = 11 ns * 2.8 GHz = 30.8
Rounded up to the nearest multiple of 2, we get tCL 32 as a starting point.

For the rest of the timings, we then get
tRCD 37
tRP 37
tRAS 37
tRFC 364
tRFCpb 252

I use GigaHertz here because Giga (10^9) complements nano (10^-9) so that I don't need to multiply or divide by 1000


Hope this is at least somewhat helpful to you.
Click to expand...

Very nice starting point...


For the Hynix 6000 I'll try:

VDD/VDDQ: 1.35V
tCL 11 ns *3 = 34
tRCD 13 ns *3 = 39
tRP 13 ns * 3 = 39
tRAS 13 ns *3 = 39
tRFC 130 ns *3 = 390
tRFCpb 90 ns * 3 = 270

Font Screenshot Technology Electronic device Software


I cant find "tRFCpb".... Where is it?
 
#2,142 ·
satinghostrider said:
Roberto, why don't you run the Asus preset (32-35-52) for your Samsung kit but change CR to 2T? If it can run, you just have to tweak voltages and test for stability. It's under Memory Presets in DRAM timing control.
Click to expand...
I did that... O have a hynix 6000 cl40 kit...
But changing to 2T I have a BSOD after a few minutes...
I'll try to clear CMOS and do it again and test...
 
#2,159 ·
sblantipodi said:
Are all of you producing winter overclock? :D
this summer you'll have +10C degrees on the RAM more or less...

Will you change your OC or repeat the process this summer?
IMHO a RAM OC should be stable without taking temps into account.

If you are doing it to show some results in forums ok but if you "use your computer" it's another story :)
Click to expand...

It's impossible to me to set a winter overclock.... LOLOLO

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Today was 35C outside... I
In my office, with AC on, it's 28C at 20h20...
Water temp is 34C...

Hand Circuit component Gesture Finger Nail


When gaming, the room temp goes over 30C.. LOLOL
 
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