I fail at mem OC
 
 

I don't bump it back down after training. I am unaware of any correlation between high sa/io and imc degradation, that doesn't mean that there isn't any though. I just haven't seen it yet at my side.
When I was testing the 390 dark alot, I was beating the hell out of some 9900k cpus 1.55+ io/sa for the really high 4900mhz+ LL benching mostly on air cooling too. Kept working well every session without any decrease in overclockability that I could tell. 
 

Zeddivile
Do yall bump VCCSA/IO back down to under 1.4 - 1.45 after training?  When shooting for High-ish Bdie clocks? or Leave it up at 1.4/ 1.45 for the entirety of the bench session?
 
In my small sample size of 3 9900K's I can't get training @4300+ w/o at least 1.4v SA and I am pretty sure my chips don't enjoy long exposures to 1.4v sa/io.
 
One of my CPU's after running 1.45v SA for about 5 bench sessions of ~5 hours per session decided it only likes at least 1.375v+ SA regardless of clock.
 
Which i correlated with a degradation of IMC associated with SA V at 1.4v but I didn't know how to validate that theory and am mostly just in a state of perpetual speculation and assumption. #feelsbad
 
 
 
 

tfures

Testing Super PI 32M 5GHZ efficiency. Btw these are A2 PCB B-dies

Nice clocks and timings.

sergmann
did someone use A2 mem with tight timings like tfures, but not HOF-Mem maybe g.skill?

Yes. Sabishii Hito did with GSKill 4000C17 Royal.
Check first page of this thread: https://forums.evga.com/FindPost/2934265
 
 

Oh, I see. I have a Gskill 3600 Royal (A2) kit to check. Only the time is the problem :)
I will try in weekend and let you know.

Geekbench 3  X299 Dark My Z390 Dark is on Order ATM
http://browser.geekbench.com/geekbench3/8798272
Are you using the same OC Setting that is Posted in Post #1 for the CPU?

 

Geekbench 4
https://browser.geekbench.com/v4/cpu/14145618 X299 Dark My Z390 Dark is on Order ATM
https://browser.geekbench.com/v4/compute/4378806
 

I'm using the same settings from the first post, but with A2 Mems it was not possible to boot with 12-11 or 12-12 higher than 4000 and tight timings 😔

radippc
how tight you wants ? c12 or c14 
with c12 i can reach 4133 with c14 i can bench gb3 at 4933 
 

Can you please send me your profiles for 4133 C12 and 4800 C14?
I tested three kits, with the TeamGroup it was possible to use 4800 and C14 but not 4xxx with C12.
Two more kits from G.Skill can only run with C12 and 4000, 4700 or 4800 with C14 not possible. Both kits make it on the Asus Apex XI :(.

Hello all
Congrats to EVGA for a great overclocking product.
Mem overclocking has tons of dependencies, dimms, motherboard, imc, vsa, etc...
 
Following on this thread for tight timings.
 
My experience on bios 0.92 or the latest 1.07 regarding memory tight timings:
- A1/A0 layout @4133K C12 1T no issues
- A2 layout @4K C12 1T no issues
- A2 layout @4133K C12 1T fails to train, boot loops
- superpi-timings.jpg timings used for all the diff memory layouts
- superpi-timings-variation.jpg timings used for all except tridentz
 
Might be that the imc can't train A2 at 4133K 1T (imc handles 4800C14 2T geekbench, imc max frequency 51K 2T single channel).
 
dimm voltage, vccio, vsa adjusted per speed and memory kit used.
 
Memory and voltages used:
 
A1 - Tridentz 4266 19-19-19-39 - 4133K C12 1T - dimm 2.05 - vsa 1.45 - vccio 1.45
A0 - Galax Master 4000 19-25-25-45 - 4133K C12 1T - dimm 1.95 - vsa 1.45 - vccio 1.45
A2 - Hyperx Predator 4133 19-23-23-45 - 4000 C12 1T - dimm 1.95 to 2 - vsa 1.35 - vccio 1.35
A2 - Galax Extreme 4266 19-19-19-39 - 4000 C12 1T - dimm 1.95 - vsa 1.35 - vccio 1.35
 
Best

 
p.s. handy b-die finder: https://benzhaomin.github.io/bdiefinder/
 

Hello all
Following up on my initial comment, I have come across a different A2 kit.
Dark can train successfully with tight timings A2 1T:
A2 - Tridentz 4400 19-19-19-39 - 4266K C12 1T - dimm 2.045 - vsa 1.45 - vccio 1.45
Probably the vsa and vccio can be lowered, i've just kept the same as the board oc profiles.
At 4133 C12 1T geekbench 3 completes successfully.
At 4266 Unfortunately my cpu imc must be on the edge, and cannot complete geekbench 3 (fails at stream add or copy).
Can train at 4133 or 4266, but not at 4200, probably it is kit related.
Looks like its Silicon lottery for A2 low latency compared to A0 or A1.
sergmann can you provide the dimm voltage, vsa and vccio?
Best.

Thank you for sharing the voltage settings used for the 4286 CL12 1T, it is really helpful.
Believe it is all silicon lottery, diff boards and memory training, cpu, dimms.
Best.

luakri
Ambient temperature dropped this morning,  I tried same settings last night without success.
Successfully completed geekbench 4266 CL12 1T dimm 2.055 / vtt -55 / vsa 1.35 / vccio 1.3.
Mem oc is hard... tons of factors.
Apparently not all dimms behave the same, same applies for voltage and temperature tolerance.
 
 

Nice
And now SuperPi run with waza :D
 

my screen is with A2 mems from HOF

My screen with Tridentz 4400 19-19-19-39 is A2 layout.