Overclock.net banner
Cancel
Create thread New Forums

AMD DDR5 OC And 24/7 Daily Memory Stability Thread

94 reading
Jump to Latest
12,621 - 12,640 of 31,499 Posts
#12,621 · (Edited)
99belle99 said:
I don't know about that. I used to be able to score better in ycruncher but since I read a post on Reddit about someone running 2200MHz IF with 1100 VDDG CDD and 1100 VDDG IOD I decided to try it and my system tried to boot and stalled and since then I cannot get the same performance from my CPU.
Click to expand...
I'm not suggesting you use 1.100v for either..

Regardless, there's no doubt whatsoever that 2200 FCLK is better than lower. As high as it's stable is the way to go.

But if you more comfortable with less bandwidth / higher latency that's your call. Just providing feedback as requested.

Maybe you screwed something up by going too high on VDDG IOD for which I'm suggesting just 0.950v NOT 1.1v
 
Save
Reply Quote Rep+ Rep+
#12,622 ·
mrcardio33x@gmail.com said:
Could probably run 2200 FCLK (almost certainly higher than just 2066)- Would help with bandwidth and latency.
May have to up to the following for stability:
VDDG CDD: 1.050v
VDDG IOD: 0.950v

If you want to try GDM 'off"
Addr_cmd = buff is GDM "off" in ASUS Bios.

My have to change the following ODT's to the falllowing for GDM off:

RttNomWr: Off
RttNomRd: Off
RttWr: 40
RttPark: 48
RttParkDqs: 40

Rather it works or not is subject to different variables / trail and error with different timings.
Click to expand...
I'll try pushing my fclk a bit higher, I'm running with mcr + power down enabled as I like 10 sec boot times not 60+ seconds due to running 64gb of ram so I know that's costing me a small latency penalty also

I don't want to push voltages much higher as I have no active cooling on my ram and its just a gaming pc mainly
 
#12,623 ·
On 8000 you basically have 2 choices for FCLK. 2000 which has great latency due to 1:1:2 but bad bandwidth. Or 2200(+) to offset the latency loss of not synced FCLK and it has better bandwidth. If you can't run 2200 then 2000 is better than 2067/2133 imho.

For any other MCLK or 1:1 MCLK/UCLK it's just whatever with the exception of 6400, that really seems to prefer 2133 over 2200.

I've been gaming a bit, Cyberpunk, The Finals, World of Tanks, and it's been fine so far on 8000C34 with Nitro 1/2/0/x8/x8 Robust Training enabled. I am not spending money on karhu so we'll never know if it actually passes but it survived 5h TM5 and some random y-cruncher and Aida stuff so good enough for me..

I even managed to drop the vSOC, VDDP and VDDIO quite a bit without losing performance in any benches or becoming unstable. I now run 2200 FCLK with 1.200 vSOC (1.186v ish load), 1.050 VDDP 1.350 VDDIO and it's perfectly happy there. That combined with 1.500 VDD/VDDQ and -20 all core -CO on the CPU makes this setup highly highly power and thermal efficient.
 
  • Rep+
Reactions: mrcardio33x@gmail.com
Save
Reply Quote Rep+ Rep+
#12,624 ·
Imprezzion said:
On 8000 you basically have 2 choices for FCLK. 2000 which has great latency due to 1:1:2 but bad bandwidth. Or 2200(+) to offset the latency loss of not synced FCLK and it has better bandwidth. If you can't run 2200 then 2000 is better than 2067/2133 imho.

For any other MCLK or 1:1 MCLK/UCLK it's just whatever with the exception of 6400, that really seems to prefer 2133 over 2200.

I've been gaming a bit, Cyberpunk, The Finals, World of Tanks, and it's been fine so far on 8000C34 with Nitro 1/2/0/x8/x8 Robust Training enabled. I am not spending money on karhu so we'll never know if it actually passes but it survived 5h TM5 and some random y-cruncher and Aida stuff so good enough for me..

I even managed to drop the vSOC, VDDP and VDDIO quite a bit without losing performance in any benches or becoming unstable. I now run 2200 FCLK with 1.200 vSOC (1.186v ish load), 1.050 VDDP 1.350 VDDIO and it's perfectly happy there. That combined with 1.500 VDD/VDDQ and -20 all core -CO on the CPU makes this setup highly highly power and thermal efficient.
Click to expand...
forget karhu, try prime 95 large FFT with AVX you really gonna know if its stable specially the FCLK
 
#12,626 ·
dansi said:
Fclk stability can be quickly tested with aida64 read and ycruncher benchmark, once passed your optimal fclk, you wil lose scores
Click to expand...
nothing comes close to prime95 large FFT AVX, i can do all day and night aida and Y-cruncher without losing scores at all. Y-cruncher FFT is ok but not like p95
 
#12,627 · (Edited)
LinPackXtreme_64 is good for testing FCLK stability as well. Run about 70 loops of the 8-10GB option. If your passes are consistent you're probably good to go.
I average a bit over 400 GFLOPS per pass here at 2200 FCLK. It should only take a bit over an hour to run. It stresses the memory pretty hard as well.
 
  • Rep+
Reactions: Desolutional and Solohuman
Save
Reply Quote Rep+ Rep+
#12,629 · (Edited)
HappySheep said:
nothing comes close to prime95 large FFT AVX, i can do all day and night aida and Y-cruncher without losing scores at all. Y-cruncher FFT is ok but not like p95
Click to expand...
Ime fclk instability doesn’t need long heavy load to show up, it’s either you can’t boot or you have windows desktop stutter before crash or have audio stutters in video or you lose scores in Aida read and ycruncher bench, in rank of decreasing severity.

once you found your optimal fclk with Aida and ycruncher, you shouldn’t be crashing

Are you sure your p95 is not due to others issues? Pbo boost clocks CO is a biggest culprit for 3D sku
 
#12,630 ·
dansi said:
Ime fclk instability doesn’t need long heavy load to show up, it’s either you can’t boot or you have audio stutters or you lose scores in Aida read and ycruncher bench, in rank of decreasing severity.

once you found your optimal fclk with Aida and ycruncher, you shouldn’t be crashing

Are you sure your p95 is not due to others issues? Pbo boost clocks CO is a biggest culprit for 3D sku
Click to expand...
I used 2200FCLK over a month without single crash on anything or audio stutter but P95 large FFT AVX pc crashes within 5-20mins, Y-cruncher FFT can take up to 3 hours to find it unstable and all other tests pass with flying colors for 12hours plus each
 
#12,631 ·
HappySheep said:
I used 2200FCLK over a month without single crash on anything or audio stutter but P95 large FFT AVX pc crashes within 5-20mins, Y-cruncher FFT can take up to 3 hours to find it unstable and all other tests pass with flying colors for 12hours plus each
Click to expand...
have you tried compare Aida read between 2200 and 2167?

also try compare ycruncher bench 2.5b between different fclk, 0-1-7 iirc
 
#12,636 ·
Butanding1987 said:
My PC reboots within a minute of running Karhu if my FCLK is unstable.
Click to expand...
i have done about 20 hours of karhu with unstable FCLK and one run of 12hours straight. Your FCLK must be extremely unstable or CPU's are just super weird 😆
 
#12,638 ·
dansi said:
meaning you have down clocked to 2167 now? Just curious what are your reads score and 2.5b timing with this lowered fclk, with every other settings same of course as a control against 2200
Click to expand...
I'm not going to discuss this any further with you sorry not gonna dig all the results and upload them here, believe it or leave it
 
#12,640 ·
With Prime95 seems like it would be difficult to pin point the issue to FCLK and not something else potentially.
LinPacKEtreme and Ycruncher worked for me so I'm not worried.
 
  • Rep+
Reactions: Desolutional and Solohuman
Save
Reply Quote Rep+ Rep+
12,621 - 12,640 of 31,499 Posts
About this Discussion
31K Replies
1.1K Participants
Last post:
gupsterg
Overclock.net
posts
28M
members
562K
Since
2004
The premier forum for overclocking experts and enthusiasts. Discuss hardware optimization, custom builds, benchmarking, cooling solutions, and pushing the boundaries of computing performance. From beginner guides to extreme overclocking, join our technical community to master system tuning.
Full Forum Listing
Explore Our Forums
Intel CPUs Hardware News NVIDIA PC Gaming Water Cooling