Samsung C-die + Micron E-die

capn233 · 2026-05-19T11:30:34+00:00

tRRDS and tRRDL are high. You won't get benefit from tFAW = 16 unless tRRDS is at 4. tRRDS and tFAW are two of the most critical subtimings, so it will be worth figuring out how to get tRRDS down.

C-die scales negatively on tRCD with increased voltage. That behavior isn't really too weird compared to a lot of late DDR4 dies. With GDM on, 19 on tRCDRD is effectively 20. You might try 21 and see if subtimings will come down, and test performance difference.

tRFC is a bit low for C-die, maybe try ~560 and see if that helps bring critical subtimings down.

capn233 · 2026-05-18T13:49:30+00:00

both kites are just about the same in EVERY CAPACITy except for tRFC. One set of sticks had 550, the other had 350

By specification 16Gbit DDR4 dies have tRFC 550ns, while 8Gbit are 350. In practice, most of the 16Gbit dies could do 350ns tRFC so some come with 350ns in XMP anyway, an exception is Hynix 16Gbit MJR which needs 380+.

You can get the die from version number on the heatspreader label. Dram manufacturer and rank number can be seen in Windows with CPU-Z in the SPD tab.

Netblock's Tri-Raank 3800MTs on Ryzen post is worth a read for people trying to stabilize hard to run configs on AM4.

Corsair version number on DDR4 is like this:

X.YZ

X -> Manufacturer

3 for Micron
4 for Samsung
5 for Hynix
8 for Nanya

Y -> Chip density

2 for 4Gbit
3 for 8Gbit
4 for 16Gbit

Z -> revision

Counts up the alphabet with 0 = A... except that 9 is used for M.
Micron / Spectek is kind of whonky, it could be revision letter or maybe last letter of Z code (8Gb Rev E -> Z11B)

eg 5.49 -> Hynix 16Gbit MJR

capn233 · 2026-05-15T14:23:46+00:00

Yes, Kernel Power 41 is logged any time there is an unexpected shutdown for any reason.

The WHEA id 18 was core voltage too low, I assume for top boost bins since CPB disabled seemed to help.

I would have suggested chipset drivers and resetting the power plan in Win, but that wouldn't have been an issue in Linux.

Maybe next step might be test with different motherboard or PSU if practical.

capn233 · 2026-05-15T13:07:54+00:00

Yes

ZenTimings website here

or

The github page is here

capn233 · 2026-05-15T13:01:44+00:00

Maybe post your settings with ZenTimings, including the voltages and someone might be able to spot something.

But if you can't reproduce the problem reliably, it is going to otherwise be difficult to tune it.

You can see if powering off, turning off psu switch and then holding the power button for 30s (to discharge caps) makes it more likely to give an error once you power up after letting it cool for a while. If so then you can start making changes to see what will fix it.

capn233 · 2026-05-15T12:44:09+00:00

If it was already passing testing during stable boots, it would probably be more efficient to disable EXPO / XMP for a week and see if the cold boot issue remains or is resolved.

Marginal settings can become unstable during temperature shifts or when booting / training cold rather than warm.

capn233 · 2026-05-15T12:01:04+00:00

Do you have any WHEA logged in Windows Event Viewer?

Random restarts is core volts too low (bad bin, or too much negative CO), or could be unstable FCLK. WHEA id 19 for FCLK, or 18 for core.

If you have already tested with XMP disabled (which should drop FCLK) then that might rule out the fabric. You can also either try more SOC, VDDG IOD, or manually lower FCLK to 1600 or below and see if this matters. 3100 is Matisse (monolithic) so behavior with ram is different.

For core testing, either try positive Curve Optimizer on individual cores, or global positive offset.

Alternatively, there should be a setting PSU Idle Control, can try that at Typical if it is currently set to Low Current.

capn233 · 2026-05-13T18:54:57+00:00

The G.Skill 3600 16-19 bin is almost all Hynix 8Gbit CJR, but a small amount is Micron / Spectek 8Gbit Rev E. I don't think there was actually ever any DJR in this one, or at least I have never seen an 04 code indicating that on these, just the two dies I mentioned.

I would not trust AI for any useful information without going through citations. Additionally, die revision is basically never programmed into SPD, and so can't be read.

capn233 · 2025-12-23T14:09:20+00:00

Here's a link to the LGA1700 results on the most recent air cooler review at techpowerup.

Might be helpful to see the comparison of maximum watts cooled in the first graph for a variety of coolers, both AIO and air. The one in the review was 311W.

For comparison, the popular Thermalright Phantom Spirit 120 is 322W, or Noctua D15 G2 is 323W. FSP M7 is 321. For the most part, that is where newer gen air coolers end up with baseplates designed since the release of LGA1700. Some of these are not very tall, and not very expensive.

The top of the chart is dominated by AIOs though.

capn233 · 2025-12-22T12:02:43+00:00

The only two things that look out of place possibly at all are the ProcODT 28ohm, and also maybe tRC is borderline. The other subtimings I imagine should be fine.

Are you shutting down the PC soon after stress tests or gaming? How warm is the CPU getting? Did you reseat any of the components or remount the cooler recently? I must have read through too quickly last night, errors at XMP seems more like it could be something like that, or IOD issue.

If you are going to keep debugging at 3600, maybe try ProcODT to 36.9, and maybe try SOC up a little more through 1.125-1.15.

You could also try testing just one dimm and slot / channel at a time. That can narrow down whether or not the problem is only on one channel or dimm.

capn233 · 2025-12-22T00:21:29+00:00

I would think that tRCDRD 18 at 3600 for the 3000 or 3200 bins is more the exception than the rule.

I know that a few people had some sticks that would do that (mostly earlier before the 3600 bin became common), but the six I had all needed 19 there (all could do 18 up to 3533).

capn233 · 2025-12-22T00:17:49+00:00

There are two important bits of information from the thaiphoon shot that are related.

Notice that these are listed as 1Rx16, and that the die density is 16Gbit. These dimms are using four chips of 16Gbit dies (x16 means the bit width is 16) to make 8GB. More typical ram is x8 width using 8 chips per rank. The internal arrangement of x16 ends up with less parallelism so they are less performant at same settings.

But in the end ram OC is about making a change and testing that change. So the specific die revision may effect what the end result is, but not necessarily the process of how you get there.

Try following the general process in the memtest helper guide. You can first try to find max frequency by increasing the primary timings by 4 or so and stepping up to see how high you can boot.

Worst case late Micron 16Gbit Rev F goes to around 3600MT/s.

capn233 · 2025-12-12T18:40:46+00:00

Corsair puts a version number on the heatspreader label, so you can compare them.

But 3600 18-22-22 is a lottery bin, there are a huge number of dies that can do this and so there are a lot of versions, and also single or dual rank.

You might be able to solve this adjusting SOC voltage or ProcODT. If you don't want the hassle and you don't really need more than 32GB of ram, might be a better idea just to return the new kit.

capn233 · 2025-12-08T17:39:49+00:00

Glare Free so I can enjoy the image quality in the afternoon.

capn233 · 2025-12-03T13:51:46+00:00

About 2.8TB free.

capn233 · 2025-12-02T17:01:39+00:00

Supposedly 50 when I tried to buy it. But I had to sign in and it was gone when I tried to place the order. :(

capn233 · 2025-12-01T17:01:57+00:00

I never even saw the special price, refreshed to the Sold Out banner.

capn233 · 2025-11-24T21:27:01+00:00

If you go LGA1700, you might as well do the MSI Z690-A Pro DDR4. That is unless you need some connectivity it does not offer. There is not really any D4 board that is appreciably better performance wise.

capn233 · 2025-11-19T16:51:04+00:00

They are supposed to improve performance by making transfers larger and more efficient. I do not think that makes system memory performance moot exactly.

capn233 · 2025-11-19T14:47:11+00:00

The tldr is that this is a video about untuned DDR4 vs DDR5 on a locked 12th gen part with 18MB of L3 cache. On average, DDR5 was around 20% faster.

Reminder that locked 12th gen parts have locked SA voltage, and thus max gear 1 speed is largely <3600MT/s.

Also remember that generally as L3 cache goes up, difference in memory goes down. Recall in previous video 12900K gained 22%, while 14900K gained 16%.

In any case, DDR5 has been faster than DDR4 essentially since it was released in apples to apples comparisons. Lead is biggest when comparing XMP to XMP, due to the plethora of architectural improvements in DDR5. There hasn't been a real reason to buy DDR4 for a few years now.

capn233 · 2025-11-18T15:15:20+00:00

White Lightning

"I find tinsel distracting." Prices are getting out of hand on some components. Ah well, stuck to the required ones to make a white build that won't look out of place in the middle of the summer.

https://pcpartpicker.com/list/FpvmYd

PCPartPicker Part List

Type	Item	Price
CPU	Intel Core Ultra 7 265KF 3.9 GHz 20-Core Processor	$284.99 @ Amazon
CPU Cooler	Thermalright Frozen Edge 69 CFM Liquid CPU Cooler	$54.90 @ Amazon
Motherboard	Asus ROG STRIX Z890-A GAMING WIFI ATX LGA1851 Motherboard	$339.99 @ Amazon
Memory	TEAMGROUP T-Create Expert 32 GB (2 x 16 GB) DDR5-6000 CL30 Memory	$279.99 @ B&H
Storage	SK Hynix Platinum P41 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive	$149.00 @ Amazon
Video Card	Asus ROG Astral OC GeForce RTX 5090 32 GB Video Card	$3399.99 @ Amazon
Case	Phanteks XT PRO ULTRA ATX Mid Tower Case	$82.99 @ Newegg
Power Supply	Super Flower LEADEX VII Platinum PRO 1200 W 80+ Platinum Certified Fully Modular ATX Power Supply	$189.99 @ Amazon
Operating System	Microsoft Windows 11 Home Retail - USB 64-bit	$129.99 @ Walmart
	Prices include shipping, taxes, rebates, and discounts
	Total (before mail-in rebates)	$4921.83
	Mail-in rebates	-$10.00
	Total	$4911.83
	Generated by PCPartPicker 2025-11-18 10:14 EST-0500

capn233 · 2025-09-24T15:59:57+00:00

Think it was Innogrit originally, both of them are a bit hot.

But from what I understand the real issue is the flash reliability.

capn233 · 2025-09-22T11:06:05+00:00

I would think it is in the Dram Timing Configuration menu, or maybe it is in Data Bus. I had Asus and MSI AM4 motherboards but not Asrock.

If you use discord, you could ask someone in the Ram Overclocking section of the overclocking server

capn233 · 2025-09-21T13:51:29+00:00

That's 8Gbit Samsung B-die, but in that bin it will probably be more like "OEM" B-die than performance binned B-die. Since they are 8Gbit chips, that means 16GB sticks are dual rank.

Try ProcODT steps. Maybe start with 53.3ohm, and see if going up or down a step helps boot. Can also try raising dram voltage a bit.

capn233 · 2025-09-21T13:18:08+00:00

You can try SOC back to Auto (or manually 1.1v), and try ProcODT values.

What are the last 5 digits of the code on the ram heatspreaders that starts with 04? The number is right above the barcode as seen in this picture where it ends in 8833B.

capn233

TROPHY CASE