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post #10401 of 11272 (permalink) Old 11-05-2019, 04:20 PM
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Quote: Originally Posted by robertr1 View Post
Now you have my curiosity on why tfaw is acting this way....
Well i did the ultimate test:
Cleared cmos, loaded optimized default, memory to jedec spec 2133.
tFAW was set at usual 24, everything looked fine.
Stressed the cpu with for 5 min with prime95, recorded the temps.
Then raised tfaw to 63. And temps dropped again.

Maybe i damaged something while delidding this CPU, who knows ?
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post #10402 of 11272 (permalink) Old 11-05-2019, 04:21 PM
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Raised IO/SA, no effect, errors immediatly. Raised DRAM to 1.59v, errors gone.

I'm not joking with this question, how "safe" is it to run 1.59v (load 1.584v) on DDR4 B-Die. I mean, it works. It passed the first 100% pass just fine. It isn't getting super hot either, DIMM's seem to sit at around 46-48c with a 120mm blowing on them.[/QUOTE]

Limit ? I would probably draw the line around 1.65v for b-die.
But in my case i'm limited to 1.55.
Damn, 46-48 is pretty hot !

Do report back if you get that 4400 working. Thanks[/QUOTE]

1,584v wasn't enough. Errored at 139%. I am not going any higher. I don't wanna risk degrading my RAM for that 1% of "performance".

Hot? Maybe. Probably because they are Corsair Vengeance RGB with the lights still on on full RGB and those heatspreaders aren't as good as G.Skills. I turned up my 120 RAM fan a bit and they settled around 39-41c with a bit more airflow.

I'm not going to get 4400C16 on these chips at reasonable voltages.
I'm testing 4400-17-18-18 now with pretty tight overall timings on 1.55v. AIDA numbers look very promising.

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post #10403 of 11272 (permalink) Old 11-05-2019, 04:41 PM
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Quote: Originally Posted by Imprezzion View Post
Not really. RTL /IO-L are pretty high at 74 so they might have some room (my RAM for example Auto trains at 69 on 4200 and runs 67 just fine with 21 offset) but the rest looks pretty clean.

Are these B-Die's or a different IC?

Might just wanna shoot for a higher frequency next. 4200C16 should give pretty much the same latency but way more bandwidth.
These are B-Die's.
Not to fimiliar with Ram overclocking and it could be my mobo but my sticks hate anything over 1.5v even with a fan directly on them. 4200 is proving to be very dificult even after raising all the primary timings +2 and trying higher vccio and vccsa, any other things i could try?

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post #10404 of 11272 (permalink) Old 11-05-2019, 04:42 PM
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Quote: Originally Posted by bxcounter View Post
Well i did the ultimate test:
Cleared cmos, loaded optimized default, memory to jedec spec 2133.
tFAW was set at usual 24, everything looked fine.
Stressed the cpu with for 5 min with prime95, recorded the temps.
Then raised tfaw to 63. And temps dropped again.

Maybe i damaged something while delidding this CPU, who knows ?
nah, if faw window is held open for much longer than in takes to perform 4 ACT commands spaced by RRD_s, the ram and IO sit doing noting until the "four activate window" closes. Eg, things slowed down...

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Last edited by Jpmboy; 11-05-2019 at 05:20 PM.
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post #10405 of 11272 (permalink) Old 11-05-2019, 04:48 PM
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Quote: Originally Posted by FarmerJo View Post
These are B-Die's.
Not to fimiliar with Ram overclocking and it could be my mobo but my sticks hate anything over 1.5v even with a fan directly on them. 4200 is proving to be very dificult even after raising all the primary timings +2 and trying higher vccio and vccsa, any other things i could try?
If set manually, raise tCWL and tWR +2.
Don't go +2 on all primary timings just for 200Mhz. The 4000Mhz OC would probably be more efficient at that point.

As for me, I'm making the same mistake again of changing like 20 different timings and then testing. If it errors I haven't got a single clue which one causes the problem to begin with. I'm just going to run 4400 17-19-19-39-350-2T with all Auto subtimings, very safe settings, 1.35v SA/IO just to be sure they are high enough and see what it does. If that errors then my 4200 C16 is more efficient so I'll keep that.

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post #10406 of 11272 (permalink) Old 11-05-2019, 04:51 PM
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Quote: Originally Posted by Jpmboy View Post
nah, if faw window is held open for much longer than in takes to perform 4 ACT commands spaced by RRDD_s, the ram and IO sit doing noting until the "four activate window" closes. Eg, things slowed down...
So it's basically stalling the cpu which lets it cool down between the next instruction?

His performance numbers should tank in that case during benchmarks, right?
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post #10407 of 11272 (permalink) Old 11-05-2019, 05:18 PM
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Quote: Originally Posted by robertr1 View Post
So it's basically stalling the cpu which lets it cool down between the next instruction?

His performance numbers should tank in that case during benchmarks, right?
memory benchmarks - yes... unless his low-FAW settings cause any timing clashes with other timing sets.

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post #10408 of 11272 (permalink) Old 11-06-2019, 03:16 AM
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Nah, 4400 is going to be quite difficult to run on my setup..

I let it run HCI last night in 4400 17-19-19-39-350-2T 1.55v 1.35 IO 1.30 SA and it got to about 360% before throwing an error so it's close but not there yet. Wierd thing is, dropping timings to 19-22-22 doesn't actually make it any more stable as even that crashed at 400% ish. Lowering voltages makes it even worse lol.

The limiting factor is either just RAM frequency and it needs way more DRAM voltage (1.6v+) to run 4400 or my IMC is just incapable of running 4400Mhz.

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post #10409 of 11272 (permalink) Old 11-06-2019, 03:23 AM
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Quote: Originally Posted by robertr1 View Post
So it's basically stalling the cpu which lets it cool down between the next instruction?

His performance numbers should tank in that case during benchmarks, right?

It would be the most visible loss of performance in tests like Linpack that are memory bw efficiency bound. In my friend's memory tuning i think he went from 410 to 490 Gflops on 5Ghz 9900k.
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post #10410 of 11272 (permalink) Old 11-06-2019, 07:26 AM
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I think my ram is stable now.
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