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

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#24,541 ·
Something I've never really gained a clear understanding of w.r.t. faster RAM, Overclocking, and 4DIMM configs: how much of the limitation is due to chipset/MOBO vs. CPU? Specifically, are the recent bumps in speed and 4DIMM support related to newer processors (12th gen -> 13/14th gen) or chipset/mobo upgrades (z690 -> z790)?

I remember before z790 was released people were discussing how the new mobos used the same traces and designs as z690, and concluded z790 wasn't going to provide meaningful upgrades in RAM compatibility or 4DIMM configs... but QVL lists seem to indicate Z790 has better support, even above any beyond what is offered by the CPU?

Secondarily, are 4DIMM configs still a complete crapshoot outside of the slower 4DIMM kits? Like, is there any hope of getting 2 kits of 2x32GB 6000 CL30 to work? Wasn't able to get that stable last year on a z690+13900ks above 5200Mhz whatsoever.
 
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#24,542 ·
PoizenJam said:
Something I've never really gained a clear understanding of w.r.t. faster RAM, Overclocking, and 4DIMM configs: how much of the limitation is due to chipset/MOBO vs. CPU? Specifically, are the recent bumps in speed and 4DIMM support related to newer processors (12th gen -> 13/14th gen) or chipset/mobo upgrades (z690 -> z790)?

I remember before z790 was released people were discussing how the new mobos used the same traces and designs as z690, and concluded z790 wasn't going to provide meaningful upgrades in RAM compatibility or 4DIMM configs... but QVL lists seem to indicate Z790 has better support, even above any beyond what is offered by the CPU?

Secondarily, are 4DIMM configs still a complete crapshoot outside of the slower 4DIMM kits? Like, is there any hope of getting 2 kits of 2x32GB 6000 CL30 to work? Wasn't able to get that stable last year on a z690+13900ks above 5200Mhz whatsoever.
Click to expand...
From my POV, the limitation is in the mobos and its BIOS, which are mostly not that well developed. It is a combination of both. Not CPU related. The new generation of the Z790 has improved that limitation a bit. 7400/7600 at best. A binmed CPU couldn't do anything on a bad mobo. I guess 7200 is the best real speed to run in 2DPC so far.
 
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#24,543 ·
PoizenJam said:
Something I've never really gained a clear understanding of w.r.t. faster RAM, Overclocking, and 4DIMM configs: how much of the limitation is due to chipset/MOBO vs. CPU? Specifically, are the recent bumps in speed and 4DIMM support related to newer processors (12th gen -> 13/14th gen) or chipset/mobo upgrades (z690 -> z790)?

I remember before z790 was released people were discussing how the new mobos used the same traces and designs as z690, and concluded z790 wasn't going to provide meaningful upgrades in RAM compatibility or 4DIMM configs... but QVL lists seem to indicate Z790 has better support, even above any beyond what is offered by the CPU?

Secondarily, are 4DIMM configs still a complete crapshoot outside of the slower 4DIMM kits? Like, is there any hope of getting 2 kits of 2x32GB 6000 CL30 to work? Wasn't able to get that stable last year on a z690+13900ks above 5200Mhz whatsoever.
Click to expand...
Whole point of upcoming clock driver chips for ram. Ram frequencies exceed cpu/imc capability. Can ameliorate cpu/imc limit somewhat by using only 2 dimm motherboards with excellent signal integrity and binning for strongest imc. Or you can tax the imc more and make the problem worse by using 4 dimm motherboards, populating all 4 slots, etc

Same reason people running memtests then fail in games or fail retraining....imc/signal issues (better tested with imc tests).

Articles state new clockdrivers on ram will guarantee 7200 to 8400 speeds regardless of imc.....but given so many inaccuracies in reporting....will have to wait and see how well they work and whether the introduce more latency (some articles mentioned).

 
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#24,544 ·
Gtz, I have been having better warm reboot with these values now: Rtt Wr 60, Rtt Nom Rd 80, Rtt Nom Wr 80, Rtt Park 48, Rtt Park Dqs 40. I turned OFF Vtt ODT and lowered SA voltage to 1.15V. This gave better long term stability than on Auto on the z790i Edge. If anyone else had success with changing anything else like Vref pls let me know what to try out next.
 
#24,545 ·
SuperMumrik said:
This was disappointing to read as I'm planning to make an build with this mobo. What size and brand of pads did you use for chipset and vrm?
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It does have its short comimgs, but if you run it open air with a fan above it, below it and with proper IMC you should be able to stabilize 8200. I currently run 7800 with tight timings, took me a few months to find and stabilize this profile. I can bench and game at 8200 at the expense of looser timings and RTLs, but still not 100% stable. Got a lot of little weird errors. 7800 has been rock solid and really enjoy it.

If I run like this, I can get close to stabilizing 8200.

Plant Gadget Electronic instrument Audio equipment Electrical wiring


But in a case, I am restricted to 7800 - 8000. In a case I suggest what I did and have the top and rear as intake to blow over the case and front as exhaust.

Automotive tire Automotive design Audio equipment Vehicle door Computer hardware
 
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#24,546 ·
Shame MSI didn't include TB4 on the z790i Edge. It would be a strong contender for ITX enthusiasts. I'm currently using the Strix z790-i and working towards full stability with 8000c36. Karhu is giving me intermittent errors which I'm trying to chase down. Just very time consuming since TM5 and YC VST VT3 is passing, but Karhu likes to error out late into stability testing.
 
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#24,548 ·
chibi said:
Shame MSI didn't include TB4 on the z790i Edge. It would be a strong contender for ITX enthusiasts. I'm currently using the Strix z790-i and working towards full stability with 8000c36. Karhu is giving me intermittent errors which I'm trying to chase down. Just very time consuming since TM5 and YC VST VT3 is passing, but Karhu likes to error out late into stability testing.
Click to expand...
Set your windows in performance mode than try Karhu
 
#24,550 ·
Hello guys. I want to hear your thoughts on my timings, voltages etc. Sticks are under fans and not going above 43C in TM5 and cruncher. Any suggestions what I can fix/try? Can I use it on daily basis to play games or I should change something? Heard that high tREFI may cause problems if used all the time.
Font Screenshot Technology Electronic device Multimedia
 
#24,551 ·
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#24,553 ·
motivman said:
Loving my new team group 2X24gb 8200 CL38 kit. getting 8600 stable has never been this easy on my 13900KS, or maybe its the new OG Apex bios?

VDD/VDDQ - 1.51v
SA/MC/TX - AUTO
VDD/VDDQ - 1.51v
SA/MC/TX - AUTO

View attachment 2649220
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From some previous posts and yours too, it looks like 9901 is working well for the OG "white" Apex.
You should add what Z790 Apex version your using (OG/Encore), (since a lot of folks don't take the time to see it in your Mem TweakIt), and also you should add that you're water-cooled, (obvious by your SPD Hub temps). TG Extreem's {2x24/8000/8200] (air-cooled) are maxing out around 8400-8533 depending on settings so thanks for this info. Nice job! Also can you pass VST/VST3 @ 8600? .....this has been a fail for most using that same memory at 8600.
 
#24,554 ·
J_Lab4645 said:
From some previous posts and yours too, it looks like 9901 is working well for the OG "white" Apex.
You should add what Z790 Apex version your using (OG/Encore), (since a lot of folks don't take the time to see it in your Mem TweakIt), and also you should add that you're water-cooled, (obvious by your SPD Hub temps). TG Extreem's {2x24/8000/8200] (air-cooled) are maxing out around 8400-8533 depending on settings so thanks for this info. Nice job! Also can you pass VST/VST3 @ 8600? .....this has been a fail for most using that same memory at 8600.
Click to expand...
I'm tempted to buy these memories over the Gskill ones. At 8400 with Air, what temperatures does it reach? I say with a fan on top. It seems to me that with those timings and voltages, YC would be good to know if it holds up, VST+VT3 for at least 30 min..
 
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#24,555 ·
Resaj is that an full ATX mb? Why cant you hit higher frequency on the ram? Timings looks fine to me and tRefi doesnt affect longevity at all. But if the value is to large it can cause errors(it doesnt charge the cells often enough to maintan the cell's voltage, so information is lost). The cells needs recharging more often at higher temperatures, so smaller number=more often recharge. Have you tried adjusting the voltages to find the sweetspots so you can crank up the speed?
 
#24,556 ·
lmfodor said:
I'm tempted to buy these memories over the Gskill ones. At 8400 with Air, what temperatures does it reach? I say with a fan on top. It seems to me that with those timings and voltages, YC would be good to know if it holds up, VST+VT3 for at least 30 min..
Click to expand...
I never tested 8400 on air, but I tested 8200 @ 1.4v on air... with a case temp of about 33C, it was maxing around 47C with 2 noctua 60mm fans blowing on it. Even on stock settings, 8000 and above on passive air was not stable. Temps will quickly hit 70s and I start getting errors. I had to put a fan on them to get them stable on air.
 
#24,557 ·
J_Lab4645 said:
From some previous posts and yours too, it looks like 9901 is working well for the OG "white" Apex.
You should add what Z790 Apex version your using (OG/Encore), (since a lot of folks don't take the time to see it in your Mem TweakIt), and also you should add that you're water-cooled, (obvious by your SPD Hub temps). TG Extreem's {2x24/8000/8200] (air-cooled) are maxing out around 8400-8533 depending on settings so thanks for this info. Nice job! Also can you pass VST/VST3 @ 8600? .....this has been a fail for most using that same memory at 8600.
Click to expand...
I do not use vst/vst3 to stability test my system. I just use testmem5, play games, watch a bunch of 4k youtube videos. Usually if my memory is unstable, I either error out watching youtube videos, or eventually get a bluescreen. I have been using the system for the past 24 hours with my above settings and not a single error, so it is stable for my use case.
 
#24,558 ·
Impuls60 said:
Resaj is that an full ATX mb? Why cant you hit higher frequency on the ram? Timings looks fine to me and tRefi doesnt affect longevity at all. But if the value is to large it can cause errors(it doesnt charge the cells often enough to maintan the cell's voltage, so information is lost). The cells needs recharging more often at higher temperatures, so smaller number=more often recharge. Have you tried adjusting the voltages to find the sweetspots so you can crank up the speed?
Click to expand...
Yes, its full ATX. Tried 7200 and 7000, had some errors in TM5, but maybe I messed up with timings or voltages. I am not really sure how I should set timings and voltages to find max possible frequency. Any advice?
 
#24,559 ·
Resaj. First I'd google what others have achived on that mb and check the QVL for that motherboard to establish a baseline. Then find out what ram chips you have.. If its Hynix A die(16gb) or M(24Gb) per stick they can often do higher frequency. If its Samsung or any other manufacturer they might not oc that much higher. So if you come to the conlusion that you should get 7200-7400Mhz on that mb I'd copy some loose timings from other users, or use the Try it function in bios and start with the loose timings option. Then set SA voltage to 1.15-1.2V, Vdd2 to 1.3V-(1.4V) and Vdd 1.45-(1.5V). And put a fan on the ram if you already dont have it. I'd just try different combos until you find a trend that gives less errors. Use Karhu app or Testmem5 with 1usmus_V3 (theres a guide for how to interpret the errors in 1usmus). I dont have any links anymore to those forum threads but you should find them by some quick google searches. I feel that Karhu finds ram errors quickes for the ram, and Testmem5 is best for memory controller issues. Once you get close someone here can probobly help you getting across the finish line with voltages.
 
#24,560 · (Edited)
Getting 8000mhz stable on air, if I water block what numbers am I looking at?
 
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