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14900K on Z690 Formula - DDR5 Kit not working anymore

alefrara
Level 8

So,

I have a fantastic Z690 Formula since the days of my 12900K: I used on it a QVL certified F5-6000J3040G32GX2-TZ5RS GSkill 64GB kit (6000 MT/s).

No issues or fancy settings inside the BIOS: just put XMP I et voilà

Same thing when I swapped to a 13900K: ****** good chip, working perfectly with almost default settings and SVID behaviour set to TRAINED.

Four days ago (do not ask me why...) I decided to go with a brand new sealed-box 14900K, everything staying the same.

Problems arised.

First of all: no matter what I try, there is no way to use XMP (I or II or Asus Tweaked) anymore. Lots of almost immediate errors in MemTest. The worst thing is that even if I try XMP but lowering the frequencies (eg 5800) I get memory errors. Worse: if I go even lower (5600/5200) the pc won't boot at all.

Only way (totally stable, no memtest errors) is to stick to the Jedec settings (4800).

Second (and somehow more disturbing) issue: even with a perfectly 4800 DDR5 Ram, if I set SVID behaviour to "Trained" (as I was used to, with the 13900K), Windows seems stable, but when I run a shader compilation for a UE5 game (eg Until Dawn) I get "out of video memory error", a very well known sign of degraded cpu. If I let the SVID behaviour to "Auto" everything seems fine, albeit with hotter temps and higher voltages.

Of course, if set to "Intel Settings with profile Extreme", everything is fresh, cool and stable, but muuuuch slower than my good old 13900K.

FYI: SP score is a pretty annoying 89 ;  IMC SP Score is 74.

Latest Bios 4001 installed way before purchasing the 14900K.

Any clue (aside the possibility of an already degraded CPU sample)  ?

Thanks in advance

Ale

 

 

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5 REPLIES 5

JJSilver
Level 7

I've done the same thing as you with my 690 Apex and what I've noticed is the 14900k's memory controller is far worse than 13th gen. I am not one to be offering suggestions to help ya with this, as I am learning what I can get away with at the moment too. I've got a 48 GB kit Gskill kit rated for 8000Mt that will only run at Jdec 5600 and no more at the moment. Still trying to get past it...

My Apex was never a good memory overclocker. I was only ever able to stabilize 6400 and dial in timings on the 13900KF. I went with a new processor since it degraded on core 0 causing games to crash. Ineligible for return due to my modifications to the chip, unfortunately. I was able to keep games from loading down the core using process lasso and reducing voltages, using LLC and capping the ratio to mitigate further damage. I'll follow along here and maybe someone more knowledgeable will chime in. Good luck.

boscacci
Level 9

I took another QVL memory kit (48x2) rated at 5600 and, again, a lot of memetest error. Staying at 4800 is pefectly fine. I reinstalled W11 24H2 from scratch and, oh boy, turn off IOMMU in bios immediately ! It sucks aways so much performance !

Now, I'm getting in CB R23 41200 points, windows fast and stable, good temps, but the ram... at 4800

Important note: when I purchased the 14900K I also purchased a Thermal Grizzly Contact Frame for 13th and 14th gen cpu: could it be the root cause for this sudden ram issues ?

thanks

Ale

PS. I am now also using latest Bios version 4101

Read more about CPU Contact Frames

The short answer is, yes, they can very much impact overclocking.

9800X3D / 6400 CAS32 / ROG X870 Crosshair / TUF RTX 4090

First of all, thank you for the reply.

I tried my best (even using a torque meter) do properly tight the screws for the contact frame. Do you suggest to loosen or tight them ? Or to get rid of it totally ? It would be a shame, given the extremely good temps..

Ciao

Ale

What I've noticed is that the new 14th gen CPUs plainly do not play nice with the older Z690 boards. I think it's due to the older architecture and the less optimized memory traces of z690. If I were to do this over again, I would have stuck with a trusty 13th gen CPU as a replacement and forgone 14th gen all together.

I've since replaced the Apex board with a ASRock z790 Nova, same 48GB 8000Mt Gskill M-Die kit, and the nearly to tenth percentile quality 14th gen chip I was lucky enough to get. With minimal optimizing, I was able to get 7600 stable. Remember, the same chip was only able to do 5600 on Z690. What that tells me is that Z690 is simply just not as optimized for 14th gen chips, albeit it will technically run. 

Keep your contact frame, it's worth the benefits. I would suggest returning your 14th gen chip if you can and get a 13th gen if possible. Otherwise, you're going to have to frame your formula, hang it on the wall and get another Z790 board if you're wanting higher memory speeds with larger memory kits. You can try turning up your VDD and VDDQ voltage to 1.4 and IMC to 1.8V + turning up the Ram voltage. Best of luck.