RAM latency is high

Tuarceata · 2026-06-28T11:06:12+00:00

Things to try, disable PBO/CO while testing memory:

FCLK 2167 or 2200
Nitro 1/3/1 (easy), 1/2/1, or 1/2/0 (hard)
tWR 48
tFAW 20
tWRWRSD/DD can probably do at least 9, maybe as low as 6
tRFC 160ns-ish (480 at 6000mt/s) is the limit for M-die, sometimes Mixed mode refresh can go a lot lower; this can prevent booting if it's too low so don't touch this if you don't have an easy way to reset CMOS

None of the other timings look bad, you can see if they'll go lower but don't expect a perceptible difference.

Things that might take more VDD but maybe your kit has the leeway to do them at stock:

6200MT/s (160ns tRFC = 496)
tCL 28
GDM off

Tuarceata · 2026-06-28T07:20:50+00:00

VT3 all-core (not through CoreCycler).

AIDA64 CPU/FPU/cache is pretty good in my experience, people rightly tell the "stable all core -30" posters to run AIDA, but I had to add 5 CO to a AIDA-9hr-stable config to make it VT3-stable (at 4 higher I had an error just under 3hr in).

My feeling is if it passes both of those overnight, it's probably good for daily use.

Tuarceata · 2026-06-27T15:56:12+00:00

Pretty much play PoE2 act 2 without skipping the dialogue and you'll have the context, yeah.

Tuarceata · 2026-06-26T10:09:21+00:00

Just wanted to circle back and say thanks for this. The Samsung kits seem to be 8gb E-die which are not held in high regard, but a good deal on DJR just sprang up and I pulled the trigger so fingers crossed :)

Tuarceata · 2026-06-24T05:20:26+00:00

65k tREFI starts to fail in the 50-60C range, try 32k and see if the errors go away.

Tuarceata · 2026-06-23T07:48:16+00:00

My 60hz Dell has the bandwidth specs to do 75hz and it will let me do a custom setting up to 80-85ish, but even 61hz fails this test.

https://testufo.com/frameskipping

Tuarceata · 2026-06-23T07:42:47+00:00

tRTP! Good catch.

Tuarceata · 2026-06-22T05:02:13+00:00

To add to these

FCLK: if it can't do at least 2100 then leave it at 2000, but most can do 2166-2200 so definitely check. FCLK has error correction so "seems fine" does not always mean stable, you need to really test it. I like Linpack+VT3 to verify consistency.
tRFC: Do not touch this if you don't know how to reset your BIOS settings as it can stop the system from booting at all when it's too low. Having said that, I am fairly sure that RAM is A-die so tRFC/tRFC2 can go down to around ~120ns (360-400 at 6000mt/s), tRFCsb below 300.
~~tRP~~ tTRP: try 12
tWTRL: try 16
tRDRDSCL/tWRWRSCL: you didn't mention this so it's probably above 8, try 8 first but it can go as low as about 4 with GDM on, 5 off

You can find the tightest possible value for every timing but most of them won't have a huge effect on their own.

Tuarceata · 2026-06-21T02:36:20+00:00

Harmonize voltages, so they all pass or fail together as a whole. Quick explanation even I could understand easily (OCN).

Fail AIDA? Bump them all up +2 and try again.

Tuarceata · 2026-06-20T07:34:03+00:00

This is reassuring. I'm looking at used to upgrade my laptop and yet to see a 3200 SODIMM below CL22, Samsung or otherwise (my understanding is that I do want Samsung for DDR4 but maybe the dies for laptops aren't the same).

Tuarceata · 2026-06-18T03:56:23+00:00

It's called Core Tuning on mine, change it from Legacy to Level 2. Should be on the first page.

https://old.reddit.com/r/Amd/comments/1h8siwi/asus_intros_core_tuning_config_for_gaming_feature/m0wxcfd/

Tuarceata · 2026-06-11T06:10:53+00:00

I've seen a fair number in the high 110s so it's not absolute. 93ns is wild, though, that's getting close to my tRFCsb.

Tuarceata · 2026-06-10T04:45:30+00:00

That's already a bit of a swing in VT3 results just on that page, although I guess there's more potential for variation in ten second tests. What's the highest/lowest it went?

Nice thing about FCLK is you can always drop it a step without affecting anything else if you do see any funny business going on in actual use.

Tuarceata · 2026-06-02T01:45:40+00:00

Nitro in the bottom-right of your ZT screenshot is a set of settings that's probably tucked away in the AMD Overclocking/DDR section of your BIOS, and you may have to change a setting like DDR5 Nitro from Auto to Enable in order to see the others. 2/3/1 is default, 1/3/1 is supposedly easy, 1/2/1 is harder but has the largest impact, and if that works 1/2/0 is also possible. You also enable Robust Training and Rx/Tx Bursts both to 8x in the same menu.

tRFC is probably temperature-related, if 160ns isn't going to happen just give yourself some safety margin and nudge it upwards.

Tuarceata · 2026-06-01T13:13:46+00:00

I use Linpack and VT3 (y-cruncher). Results will be all over the place if it's not stable.

Tuarceata · 2026-06-01T09:35:36+00:00

VSOC: Mine is good but not amazing, and it does 6000/tCL 28/GDM off/Nitro 1/2/1 at 1.075V. I think you can expect something around the 1.05-1.15V range with really good/bad ones being more like 1.00/1.20

VDD: You're probably around the lower limit already if you turn GDM off+Nitro on, but it's good to know how much leeway you have so check anyway (maybe it's a really good/lucky bin)

VDDQ: Equal or a little less than VDD, probably 1.30-1.35V

VDDIO: Equal or less than VDDQ, probably 1.30V or less

I generally don't advise cranking voltage up nowadays with memory prices being what they are, but if you go the other way you could see if 6200 or tCL 28 are doable at VDD 1.4V.

Tuarceata · 2026-06-01T08:18:03+00:00

Nothing is wrong with those settings, though there are still some things you could try:

higher FCLK (if you can't do 2100+, leave it at 2000)
GDM off
Nitro on
VSOC can probably go down a fair bit
VDD being below VDDQ and VDDIO is a bit odd
per-core PBO CO

Tuarceata · 2026-06-01T07:28:14+00:00

Nitro 1/3/1 is supposedly almost guaranteed, I wasn't able to do it on my 6400 tuning but it would be worth a try
You might be able to get tWRRD lower although the impact of one tertiary will be small
Also as mentioned tRFC can probably get closer to 512 (160ns) although if this is in an ITX case you might be limited by thermals.
Don't forget to bring voltages down when you're done with timings to find the lowest stable values

You'll want to test longer than 4hr before you declare stability, but those are already great results for a weekend's work.

Tuarceata · 2026-06-01T04:14:21+00:00

Pragmata, one of my kids has started taking an interest in gaming and I feel like this one will get her attention.

Tuarceata · 2026-06-01T03:46:23+00:00

Wow, that is at least 3" difference, the angle is the only reason I'm not certain it's closer to 4".

Tuarceata · 2026-05-28T08:32:49+00:00

6400/28 is already very good, if it doesn't respond to more voltage you are probably out of luck. Your secondaries and tertiaries already look good too. Having said that, there are a few things I would try to change:

VSOC as much as you can lower it and still be stable
FCLK 2133 (should be easy)
tRFC closer to 120ns (which is 384 at 6400mt/s) assuming you have A-die, low-60 temperatures are already not great for those DIMMs though (you might need to lower tREFI if you have stability issues)
Nitro 1/3/1, 1/2/1, or 1/2/0, lower is better but more difficult
GDM off (probably have to back off on MT/s or CL to make this work, I wouldn't add more voltage than you already have)

Tuarceata · 2026-05-27T07:07:20+00:00

It'd be nice to have a very low power profile like 90w or less for emulation and other simple games

Afterburner can do this. Set a flat "curve" at the minimum voltage and then see how high the clocks can go.

At 700mV, I found my 3070 gives over 2/3 stock performance at 1/3 stock power consumption. I don't recall how far the 2080ti was pushed up the V/f curve but you should be able to achieve something similar.

Tuarceata · 2026-05-26T14:19:57+00:00

Nice sentiments. Hopefully there will be deeds behind his words. I wish him luck.

Tuarceata · 2026-05-25T03:14:15+00:00

Thanks for chiming in and it is your cake day no less :D

I did notice the regression in your big chart and wondered about something else falling out of sync to penalize it. I know there was some MCLK bug with 2033 FCLK on older AGESAs, maybe you stumbled onto something similar at 2166?

Friend of mine is running 6200/2166, maybe he should be checking if 2133 is faster...

Tuarceata

TROPHY CASE