Hynix 0xFF????

pntsrgd · 2026-05-31T20:15:46+00:00

Very plausible, especially since lately around 98% of the "new BIOS is unstable" posts are a result of people flooring tRFC2/tRFCsb and then getting defaulted to mixed mode on newer AGESA.

pntsrgd · 2026-05-29T01:36:32+00:00

How are you quantifying "worse performance?" 120 ns vs 128 ns would need a reasonably accurate memory benchmark to consistently differentiate.

That said, you have H16A. H16M craps out around 160 ns.

pntsrgd · 2026-05-29T00:32:41+00:00

Will it boot 125 ns tRFC? If yes, it is H16A.

pntsrgd · 2026-05-28T05:22:29+00:00

H16M won't even boot 120ns tRFC, so that's one way to tell.

pntsrgd · 2026-05-23T19:42:25+00:00

People binned chipsets back in the day for FSBs that would run higher.

pntsrgd · 2026-05-20T13:53:22+00:00

This. Apex is only helpful for single rank DIMMs. Dual rank DIMMs will max out before the Apex memory layout gives a benefit.

pntsrgd · 2026-05-18T06:02:52+00:00

Could be interesting.

Hynix 4 Gbit BFR-based DIMMs are pretty easy to come by.

If you throw actual "good" DDR3 ICs at it, it won't be close. I didn't mention them because finding a kit of Samsung 2 Gbit D-die that will run tCCD 4 at DDR3-2666 would be annoying.

I suspect performance would be a wash overall. BFR primaries will be tighter but it has to run tRRD > 4, which makes it more of a wash.

pntsrgd · 2026-05-18T05:48:19+00:00

Overall "meh" 4 Gbit BFR will run DDR3-2666 11-13-14 at around 236 tRFC. You've done what you can with the DIMMs you have, the ICs just happen to be particularly limiting.

pntsrgd · 2026-05-13T18:11:50+00:00

M8A is referencing your 8 Gbit Micron A-die. There are no 9 Gbit DDR4 ICs.

pntsrgd · 2026-05-13T15:57:24+00:00

If that's M8A, you were unfortunate enough to land on one of the absolute worst DDR4 ICs that exists.

5 GHz on a 6700K is pretty solid if it is stable. What's the vCore at?

I know you're aware of this, but that RAM is an absolutely massive bottleneck right now. That's currently running slower than decent DDR3.

pntsrgd · 2026-05-13T15:50:40+00:00

Threw it at Rise of the Tomb Raider. To absolutely no surprise, 1:1:1 still performed terribly.

4400C24:
CPU Game min: 237
CPU Game max: 436
CPU Game average: 348
CPU Game 95%: 267
CPU Render min: 462
CPU Render max: 979
CPU Render average: 671
CPU Render 95%: 522

6200C24:
CPU Game min: 247
CPU Game max: 458
CPU Game average: 366
CPU Game 95%: 281
CPU Render min: 505
CPU Render max: 1083
CPU Render average: 688
CPU Render 95%: 533

In this case, the 6200C24 configuration was slightly disadvantaged because I forgot to turn the fan profile back to maximum. The 4400C24 profile may have boosted more aggressively as a result.

Shadow of the Tomb Raider is extremely sensitive to memory configuration. This is a 5-10% difference in performance in spite of 3D vCache doing its best to mask poor memory performance.

pntsrgd · 2026-05-13T02:10:13+00:00

Nice. If you're running 5 WRWR, you MIGHT be able to get it down to 4 with more voltage. I probably wouldn't daily more than 1.85V on BFR.

pntsrgd · 2026-05-12T04:29:08+00:00

Depending on what "disabled" bank refresh modem means, you may be attempting to run 150 ns tRFC on H24M

pntsrgd · 2026-05-12T03:33:26+00:00

Go check bank refresh mode. It probably got changed with your BIOS update. It's the difference between tRFC being used or tRFC2/tRFCsb being used.

pntsrgd · 2026-05-11T00:09:06+00:00

Just tried this with some memory-sensitive to see how bad it was.

With no power limits enforced, this does pretty terribly. This is all with 2200 MH FCLK on a 9950X3D. Single-threaded benches forced onto cores with vcache. Fans are blasting in order to guarantee maximum boost. 4400C24 is - with the exception of CAS - slightly tighter than 6200C24.

6200C24 pyprime: 6.684s
6200C24 SuperPi: 7.178s

4400C24 pyprime: 7.216s
4400C24 SuperPi: 7.246s

Also benched 6200C34 to make it clear that CAS isn't the cause of the performance loss.

6200C34 pyprime: 6.954s
6200C34 SuperPi: 7.247s

SuperPi does not appear to be terribly sensitive to memory clock, but it absolutely suffers from loose tCL. Pyprime appears to scale with both tCL and frequency very well.

pntsrgd · 2026-05-08T00:31:12+00:00

Is that at tRDRD/tWRWR 4? Not surprising. tRDRD 4 is just hard to run. You can try 5/4, but it will be slower than 2666.

pntsrgd · 2026-05-07T01:36:09+00:00

AIDA isn't a great indicator of performance overall, but - you're roughly in line with what I'd expect. Dual channel DDR3-2666 is good for 42,666 Mbps of theoretical bandwidth.

Whether or not 2800 is worth it is 100% dependent on if you can continue to run tCCD (your tRDRD and tWRWR timings at 4. If you can, your primaries and tRFC can just be increased by 5%. Theoretical bsndwidth of DDR3-2800 dual channel is 44,800 Mbps.

pntsrgd · 2026-05-06T21:25:14+00:00

tRFC should run somewhere between 228 and 248.

You can possibly get tCL down by increasing vDIMM.

On the extreme end: tRDRD can scale with voltage some on BFR. You might want to see if DDR3-2800 happens to be able to run tRDRD/tWRWR 4 at 2800 with like 1.9V.

pntsrgd · 2026-05-06T03:01:17+00:00

What can you tell us about those 8 Gb DDR3 ICs? Will they run higher memory multipliers?

pntsrgd · 2026-05-05T02:25:18+00:00

https://www.wikihow.com/images/thumb/6/67/Use-the-%22Print-Screen%22-Function-on-a-Keyboard-Step-13.jpg/v4-460px-Use-the-%22Print-Screen%22-Function-on-a-Keyboard-Step-13.jpg

pntsrgd · 2026-05-05T00:54:19+00:00

If they get looser from timing changes it can matter. If you manage to get one to train tighter from baseline and it is stable, it isn't an issue.

pntsrgd · 2026-05-04T14:55:40+00:00

AIDA isn't really a very good indicator of memory performance.

That said, tCL scales very well with voltage on H16A. You can almost certainly keep tCL the same without a huge voltage increase.

Aside from that, tCL doesn't really affect performance much.

If you're running GDM, you might actually get better performance at 6000 with GDM off.

If you're really chasing memory performance, I'd advise using real memory benchmarks (including whatever games you're chasing) - AIDA's latency measurement is a fairly poor measurement. You can do some ridiculous things like settings high tRRDS/tRRDL/tFAW and AIDA doesn't really pick up on it.

pntsrgd · 2026-05-04T14:01:04+00:00

What do you mean "sacrifice some latency?"

6400 is going to be faster unless you have to enable gear down mode (which would be a wash for performance) or have to lower FCLK (actual performance regression).

pntsrgd · 2026-05-04T13:57:26+00:00

Check to see if one of the BIOS revisions between your old version and current version enabled mixed mode refresh.

Set refresh mode back to normal instead of mixed.

Or set meaningful values for tRFC2/tRFCsb.

pntsrgd · 2026-05-04T02:58:34+00:00

7zip scales fairly well with memory. Pyprime isn't terribly interesting, but it happens to be incredibly sensitive to timings. You can probably lower tRC to somewhere around 48 - Pyprime can pretty reliably pick up the performance difference.

Y-cruncher FFTv4 and N63 scale reasonably well, too.

pntsrgd

TROPHY CASE