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XMP fails to boot.

Enderwiggin03
Level 7
Z390-E, 4x8GB G.Skill DDR4 4266 CL19-19-19-39, i9 9900k. With both XMPI and II, RAM fails to post, works at 3733 15-15-15-35. Manual tweaks don't seem to help yet.
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20 REPLIES 20

nickolp1974
Level 10
Board???? Maybe 32gb at those speeds may not happen or may require tuning of voltages.
i9 9900K, ROG Gene XI, G.Skill 4266 and one big bucket!

Silent_Scone
Super Moderator
4266 will require user input on some CPU samples. If looking for plug and play, it's always best to opt for a kit 1 or 2 pegs down from the maximum validated frequency.


Try a manual VCCSA of 1.3 to 1.35v.

Increase DRAM voltage to 1.4-1.45v
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Silent Scone@ASUS wrote:
4266 will require user input on some CPU samples. If looking for plug and play, it's always best to opt for a kit 1 or 2 pegs down from the maximum validated frequency.


Try a manual VCCSA of 1.3 to 1.35v.

Increase DRAM voltage to 1.4-1.45v


Tried those. As well as lower frequency, 3733 @1.4V seems to be the highest I can get to be reliable so far. Board is ROG STRIX Z390-E 0602 bios. The RAM is also in the QVL list. Also, tried with 2 sticks with no change.

Enderwiggin03 wrote:
Tried those. As well as lower frequency, 3733 @1.4V seems to be the highest I can get to be reliable so far. Board is ROG STRIX Z390-E 0602 bios. The RAM is also in the QVL list. Also, tried with 2 sticks with no change.


May be a weak IMC.

Command Rate 2? You should be able to get 1T with tighter sub timings at 3733.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Silent Scone@ASUS wrote:
May be a weak IMC.

Command Rate 2? You should be able to get 1T with tighter sub timings at 3733.


So far 2N, haven't tried 1, but I know it won't boot without 1.4v, I thought system agent and vccio needed a little help, but I didn't like getting so far past 1.35v. On the other hand, I've had luck with 5.1 on all 8 cores so far. When I first turned the machine on with the XMP set, it would boot, but serious BDODs. I've also played with Memok! But not sure if I'm doing something wrong, as it still won't stay stable.

HiVizMan
Level 40
Strong overclocker so you should be happy with that, IMC does seem a tad weak. But what you are getting speed wise is very good for a gaming or graphics system.
To help us help you - please provide as much information about your system and the problem as possible.

Tried 1N last night, failed to boot. Ram memtest86 with errors at 3733 15-15-15-36 2T With BIOS set to auto (2133) and stock CPU speeds the test passed. I'm wondering what I might be doing wrong.

Played around with all sorts of stuff, sadly moving BCLK up allowed to boot with 4266, but then the GPU was sitting at 300mhz. Currently back to 3733 15-15-15-36 2N @ 1.4v. Observations so far: XMP I fails to boot. XMP II boots, but unstable at stock CPU clock, but usable to a point. Manual clocking is fairly unstable as well. If I overclock the CPU, then memory overclocking is very unstable. It's strange because the system seems ok at first, then just get's pissed off and won't work right at all. Memtest86 @2133 passed, at 3733 I had 1 error on test 9, seemed like a fluke, I can live with it, as there's no issues during PC use. 4266 had over 100 errors while testing overnight. Windows Memory Diagnostic confirmed this. I've tried various voltages to the IO and SA, from 1.30-1.35 on both, and Ram Voltage from 1.4-1.5v, if lower at 3733+ system won't boot. Also forgot to mention, XMP I fails to boot with 1, 2, or all 4 sticks installed. I can't recall if the CPU speed was stock or at 5.0Ghz on all 8 cores.

HiVizMan
Level 40
Sadly I just don't have access to the memory kits currently - so not able to test out different settings for you mate.


All I can suggest is starting from the last known successful pass of memtest and work up the Frequency ladder slowly. See when and where the first set of errors start to happen. That may help identify how to resolve.

The fact that XMP 1 does not work for you does surprise me. As I have found that particular profile has had the most leeway in my experience.
To help us help you - please provide as much information about your system and the problem as possible.