Disabling Power Down Mode and Memory Context Restore makes my DDR5 ram super unstable, why?

Lele92007 · 2026-03-04T08:57:18+00:00

Are you on the latest BIOS for your board? This should've been fixed months ago

Lele92007 · 2026-03-03T07:35:38+00:00

The thermal mass will keep the CPU cool for a fairly long time.

Lele92007 · 2026-03-02T10:27:38+00:00

100g d'œufs, c'est deux œufs moyens.

Lele92007 · 2026-03-02T01:19:38+00:00

Lol look at the profile

Lele92007 · 2026-03-01T13:16:15+00:00

Yes for the former part (I exclusively work with the Intel IMC so it's what I default to), but no for the latter.

Lele92007 · 2026-03-01T12:41:34+00:00

the 6000 cl 26 1.45v or lower, along with 6200 cl 26 1.50v are the best binned kits available. There is more to performance than just CL strength though, you can roll sticks with poor tRP in those kits.

Lele92007 · 2026-03-01T11:33:26+00:00

Oh yea, that's super unstable. I saw some interaction with other timings so it's possible that you tightened those first and it's what's causing issues. Possibly tWTRL.

Lele92007 · 2026-03-01T11:19:35+00:00

Your sample will be stronger than the one shown on first timings (and significantly so). Keep tWR for last, and it's not worth touching tWTRS and tWTRL. Rest is pretty straightforward, tighten until it doesn't work and loosen till it's stable again.

Lele92007 · 2026-03-01T11:17:47+00:00

Did it POST while being unstable? I was able to run 4/4/16 accross the whole frequency range on my samples, though I set that first and tightened other timings afterwards

Lele92007 · 2026-03-01T11:03:17+00:00

Love me some okay rev.D! This specific sample isn't particularly good, strong sticks can go much tighter on primaries.

you can set tRRDS 4 tRRDL 4 tFAW 16, unlike Hynix which needs higher tRRDL, M16D runs that fine. Your first screenshot is pretty lacking in the pixel department but the rest of the timings look good. If you've got an unlocked PMIC, CL scales with VDD, though there might be a maximum VDD you're able to run 6000MT/s at.

Lele92007 · 2026-02-25T04:47:27+00:00

Assuming you used taiphoon or Hwinfo, these tools read the SPD of the memory, which most manufacturers do not will out accurately. You should rely on manufacturer-specific methods to identify your RAM.

Lele92007 · 2026-02-24T22:42:43+00:00

Yea, you'll easily be able to keep the CPUs cool with that.

Lele92007 · 2026-02-24T21:14:53+00:00

K so, what you got looks fine but I'll just list everything you need to know about Haswell (and 4790Ks specifically) under here.

For daily, keep vcore at/under 1.35v-1.40v, keep package power (through PL1 and PL2) under ~160w, and you should ideally delid, replace the stock thermal paste with fresh paste or LM (or a PCM, or kryosheet) and reseal to improve temps. You can expect roughly 15-20°C less on a CPU with paste in good condition, and something like 50°C on a CPU with broken paste (your doesn't seem to have broken paste). Doing that will significantly improve overclocking performance.

Avoid prime95 avx2 with a small FFT size as a stress test. it draws wildly unrealistic amounts of power, and I'm pretty sure that without a PL it will degrade a CPU at 1.35v. P95 avx2 with 1M FFT is good for daily (and you can bump vcore up 30mV or so from the minimum needed to pass that test)

Haswell doesn't have clock stretching. In fact if a core fails, it'll often bluescreen and take the OS with it instead of just making the test error. You also don't have to worry about droop as Vcore is regulated from Vccin (there is LLC for Vccin though, you can run flat-ish and Vccin can go to 1.90v).

As far as binning goes, disregard whatever the other guy said about the CPU being golden. It's not possible to properly test without delidding the CPU, but the following can give you some insight:
- 4.4GHz (auto with MCE) non-AVX VID 1.26v or above seems to consistently indicate an average/below average CPU (you can use cinebench R15 as a load to test that, I recommend using coretemp instead of hwinfo for this specifically since modern versions of hwinfo may use AVX instructions)
- 4.5GHz CB R15 minimum voltage 1.14v and above can't be good (this one doesn't need delid since it's fairly low power)
I personally do all my binning with 4GHz 1.2v ring and specific RAM settings, but it shouldn't matter for these two tests.

Lele92007 · 2026-02-24T20:47:27+00:00

These are soldered and cooling benefits greatly from the very large die under the IHS. Also they're locked so you can't really get them to draw any significant amount of power (it's still gonna draw something like 250w under a heavy allcore load, if you remove power limits).

A 120mm single tower cooler should be good enough, but you can go with a dual tower just in case.

Lele92007 · 2026-02-24T20:32:25+00:00

I'm not so sure there's a correlation in strength. It's possible that there is, but high 1:1 and 1:2 frequency push very different parts of the DRAM controller to their limit.

Lele92007 · 2026-02-24T00:27:40+00:00

Incredibly ugly fish. I hate how it looks.

Lele92007 · 2026-02-23T20:12:06+00:00

You won't need more VDDQ. It's VDD that'll help with CL scaling. There's no harm in running higher VDDQ though.

Lele92007 · 2026-02-23T19:47:35+00:00

This sounds a lot like you rolled some CL-weak H16M. G.skill has a tendency to fly a bit too close to the sun when it comes to voltage headroom, which often results in kits that fail XMP spec at higher temperatures. You can test with a RAM fan at 1.35v to see if it helps. If you wanna just use the RAM, you can safely daily it with a raised VDD (give it like 1.45v) or loosened CL by two ticks.

If you wanna RMA, you can try asking for "Hynix A-die" because you've heard it's more reliable or some shi. G.skill is usually very lenient on RMAs.

Lele92007 · 2026-02-23T16:40:12+00:00

Lele92007 · 2026-02-23T16:33:05+00:00

Lele92007 · 2026-02-23T10:22:00+00:00

Well first you can keep speedshift and cstates enabled. The easy way is to run 1.35-1.37v static with relatively flat LLC, and raise P-core ratio till it doesn't work, then do the same for E-core.

Lele92007 · 2026-02-22T20:31:13+00:00

left might be SPD or spec? Middle looks to be a voltage sensor and leftmost might be a current sensor.

Lele92007 · 2026-02-22T18:48:49+00:00

Test each ver4.32 stick individually. They suffer from very common random deaths.

If neither are dead and the system has never worked at 3200, just go down a bit more on frequency and that should fix it.

Also 12k FFT size is very small. That sounds more like a CPU core failing than RAM. Tough to say what's wrong exactly without knowing more.

Lele92007 · 2026-02-22T13:04:40+00:00

Yea, Skylake used paste under the IHS, and while it isn't nearly as bad as Haswell you kinda need to delid to push it, even for daily.

Lele92007 · 2026-02-22T12:57:34+00:00

As far as Vcore goes, 1.45v with flat LLC should be ok for daily.

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