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7600k stable one night but not other night! - Page 2

post #11 of 24
Thread Starter 
Thanks EMUracing - I'm getting error messages usually not BSOD. I like where you're heading with memory because that would explain the instability I'm experiencing. I understand I may not pass IBT but 5-7 hours on RB or x264 16threads fine and then errors if i try it again another night. And I bumped the vcore up further and this weird behaviour persists hence I suspect it's not vcore.

I have manually set my memory to DDR4-2666 and entered 16-18-35 and memory volt is 1.35v. I basically chose XMP and saw where the BIOS updated itself and entered those same places - but I'm doing it manually. Previously, my memory was set on AUTO.

i have also now upgraded my Prime to 27.9 and downloaded latest RealBench.
Will run IBT and Prime95 27.9 BLEND to see how i go.

Should i run Memtest or something to focus only on memory testing?

thanks
Edited by boylah - 4/14/17 at 6:50am
post #12 of 24
I would just use the Prime blend to test memory for now. Its not a full load to memory, but will usually point out weakness of the memory controller.

At the speeds you are running, the VCCIO and VCCSA should both be around 1.15v up to around 2800, then some CPUs may need a little bump up. Once you get to around 3000-3200 they can bump up to around 1.2v, and 3400+ usually needs around 1.25v at least with the two SkyLake/KabyLake CPUs that I have been testing with. VCCIO is the IO voltage, which includes the memory controller on the CPU. VCCSA is the System Agent voltage. IO usually has more effect for memory frequency overclocking, followed by SA. Either case, AUTO should have you around those voltages at the speed you are running. But, it wouldnt hurt to check what voltage you are running at.

My 3000 memory requres 1.25v VCC IO/SA at 3466, but 1.2 VCCIO and 1.25 VCCSA at 3200. My motherboard seems to undervolt the VCCSA according to the sensor reading... and on AUTO I couldnt run higher than 3200 without manually raising the VCCSA. So I would just try to check what the VCCIO and VCCSA voltage is on the AUTO setting at the speed you are running. On my Asrock z270m Extreme4, I use the a-tuning utility, since HWmonitor doesnt give me the IO voltage, but gives me the SA voltage.
post #13 of 24
Thread Starter 
@EMURacing - I'm NOT overclocking my memory - at least not intentionally. At the moment I've set it manually at 1.2 which is what my Corsair 2666 mem specs says it runs.

But are you saying since i'm bumping the multiplier, my memory is essentially being bumped as well? And i need to bump it up to compensate instead of relying on AUTO or default 1.2v? And are you saying I should use my AUTO mem setting to see what it's at, then set it manually instead of relying on Auto? Where software do i use to see various voltages for mem? I've never really played with mem overclock.

I recently changed my settings to:
DRAM = 1.2v
VCCIO = Auto (shows 1.050)
System Agent = Auto
Dram Command Rate = Auto

And at above settings, my 4.7 or 4,8 OC are very unstable, just using normal software would freeze. Whereas before, on auto, i could use windows, RB/x264 would pass just not IBT/Prime95 27.9.

thanks!
Edited by boylah - 4/15/17 at 9:27am
post #14 of 24
I have g.Skill trident 1600 rated at 1.5v that needs 1.62v to run its rated speed/timings.

You are overclocking the memory, since the standard is 2133... these have just been binned on their test equipment to run at the speeds they rated it at.

You have different equipment, which may require more voltage for the same speed that they test at.
post #15 of 24
Thread Starter 
Ok - looks like when Dram volt is on Auto - it's saying 1.35 so i just manually set Dram to 1.35v.
As for VCCIO - it's on Auto at 1.05 whilst System Agent is on Auto but doesn't say how much.
Do you think I should bump up my VCCIO and System Agent (VCSSA) to 1.15v?

I have also set my LLU to 5.

Also - I can't find what the Dram Command Rate for my mem should be. It's not on the packaging.

thanks
post #16 of 24
its fine if you use RealBench for testing only, or the 264x custom loop run overnight

I have yet to run into any problems running at 5.2Ghz on my 7600K (@1.376v) after running a few times of RealBench (8 hours with max RAM)


RealBench uses AVX as well, its just not the destroyer recent Prime is with AVX


I see youre voltage is dropping when its idle
so I'm guessing youre voltage is applied not with manual override, but either adaptive or offset


try leaving it at manual and see if it gets stable (as the voltage will always be at the set value, well with a vdroop and voltage can be different how it actually reads out and is applied compared to the setting in the Bios)
guess you have not touched LLC yet
Load Line Calibration, most guys have it at 5 or 6, try to set that as well
it kinda controls how spot on the value gets applied you enter (its more complicated but you can read in the thread you linked if you so wish)


so aside from how the voltage gets applied to eliminate a variable, you could:
- try out memtest to make sure youre RAM is not faulty or needs some more voltage
- set Cache Ratio to a lower value for now, like 42 (this has an impact on overclocks and a very very minor impact on performance, should be tested out after seeing how high you can clock)
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post #17 of 24
Quote:
Originally Posted by boylah View Post

Ok - looks like when Dram volt is on Auto - it's saying 1.35 so i just manually set Dram to 1.35v.
As for VCCIO - it's on Auto at 1.05 whilst System Agent is on Auto but doesn't say how much.
Do you think I should bump up my VCCIO and System Agent (VCSSA) to 1.15v?

I have also set my LLU to 5.

Also - I can't find what the Dram Command Rate for my mem should be. It's not on the packaging.

thanks

http://edgeup.asus.com/2017/01/31/kaby-lake-overclocking-guide/

Quote:
CPU VCCIO and CPU System Agent voltages are found in the Extreme Tweaker page (scroll down to the bottom of the page to find them).
These two voltages are sensitive to changes because they are related to signaling.
Applying too much voltage can cause instability.
Note the auto value being used by the motherboard (displayed to the left of the entry box) and apply gradual changes either above or below that value.


DDR4 frequency range Required CPU VCCIO Voltage range Required CPU System Agent Voltage range
DDR4-2133 ~ DDR4-2800 1.05V ~ 1.15V 1.05V ~ 1.15V
DDR4-2800 ~ DDR4-3600 1.10V~1.25V 1.10V~1.30V
DDR4-3600 ~ DDR4-4266 1.15V~1.30V 1.20V~1.35V

The values shown in the table above are a guideline only.
Some CPUs may require more voltage and others less.


running memtest would also eliminate youre RAM being faulty, can sometimes happen
RAM problems are kinda hard to track down otherwise

hasn't happened to me in ages, but its a possibility

but for now it could need a bit more voltage, however 1.35v for RAM should be plenty if not running it faster than Intel stock speeds, on Kaby lake 2400

still I would try to set vcore to manual first and see if it stays stable
Edited by peter2k - 4/16/17 at 1:07am
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post #18 of 24
Thread Starter 
I have manually set the following:
Mem speeds = 2666 with 16-18-35-2N
DRAM = 1.35v
LLU at 5
vcore 1.34 at 4,8Ghz

Prime95 blend still fails very quickly.
If I add AVX offset of 2 then Prime95 blend works fine for 6 hours. So I'm wondering either my vcore need more juice of my mem does. Thoughts?

Also...

For my DRAM - since i've set it to 2666 instead of auto, does that mean i've basically forcing it to stay at stock? This should have been fine at dram 1.2v but it was stable. 1.35v is fine so maybe even at 2666 i need more than 1.2v. Should I lower 1.35 to see when it crashes?
Does is also mean, when i had my mem speed on auto, it was actually adjusting depending on my BCLK and going above 2666?

I've still not touched the following - both are still on Auto.
VCCIO = Auto (BIOS shows 1.050)
System Agent = Auto (Can't find what this is currently at) or is this same as VCCIO?
Should i set these to 1.050 instead of Auto?
Edited by boylah - 4/16/17 at 8:10am
post #19 of 24
Thread Starter 
Quote:
Originally Posted by peter2k View Post

its fine if you use RealBench for testing only, or the 264x custom loop run overnight

I see youre voltage is dropping when its idle
so I'm guessing youre voltage is applied not with manual override, but either adaptive or offset

try leaving it at manual and see if it gets stable (as the voltage will always be at the set value, well with a vdroop and voltage can be different how it actually reads out and is applied compared to the setting in the Bios)
guess you have not touched LLC yet
Load Line Calibration, most guys have it at 5 or 6, try to set that as well
it kinda controls how spot on the value gets applied you enter (its more complicated but you can read in the thread you linked if you so wish)

hi Peter,

Yes, I noted my voltage is dropping too but I had it on manual (or perhaps that was after those screen shots). I had wondered that too but reading online gave me that impression that's normal - just vdroop?
I have since set my LLC to 5 instead of manual. Not sure when i should play with 6 instead.

My settings on Asus Prime z270-K:
BCLK = Manual
Core Ration = 48
Adaptive = Disabled
Vcore = 1.34
AVX negative offset = 0
Speedstep = auto
Turbo = enable
IA AC & DC Load Line = 0.01

Dram = 1.35v
BLK Freq (Dram Freq) = Auto
Dram Freq = 2666
Mem = 16-18-35-2N
LLU = 5
VCCIO = auto (bios reads 1.050)
System Agent = auto
Edited by boylah - 4/16/17 at 8:10am
post #20 of 24
Thread Starter 
Finally, i just tried IBT briefly and one of my cores are hitting 82-84C. Is that bad? Rest of the cores are 75-77'C. I assume I should back off running IBT? I have Noctua NHD14 on two fans. Since it's only 1 core, does that mean i should re-seat my fan and reapply tim? I'm not looking to de-lid.
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