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ROG Crosshair VI overclocking thread - Page 787

post #7861 of 17070
Quote:
Originally Posted by SwiperNoSwiping View Post

What setting would you say is too high though? is 80 ohm that people here achieving good results with okay?

Yep 80 is fine.
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post #7862 of 17070
Not a good day so far. Having a new problem. With 1002 I really had no problems with DOCP standard and 3200MHz (Flare-X memory). With 0079 and 0081 I have a problem where it works fine until I shut down. If i cold power cycle (i.e. turn the PSU off), it never comes up. It bootloops until it falls back to 2400MHz. I didn't have this problem with 1002. I tried adjusting some voltages and saw no improvement.

Anyone have any suggestions? I've seen this issue reported earlier in the thread with older BIOSes but this is my first experience with it recently.
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post #7863 of 17070
I'm using 0083 and I am getting mixed results. On one hand, my ram (F4-2800C16D-16GVG) is running at 3200mhz 16-16-16-36 at 1.35v stable in memtest86 and realbench. However, I am getting some odd behavior from the cpu (1700) when I try to overclock it with multi/offset voltage and pstate/offset voltage.

With bios 0038 I was able to get 3.95ghz at 1.35v using voltage offest of +.2 and LLC of 3. With these settings on the new bios, my cpu gets ridiculously hot under load. cpu-z and hardware monitor read the voltage correctly at 1.35v, but the temperature maxed out at 90c when it used to barely touch 60c before. It unfortunately ran at this temperature for almost 30 minutes because I didn't have the temperature monitor open at the start of the test, just cpu-z to verify clock speed and voltage. I get the same behavior when I try to use pstate overclocking with the offeset voltage as well, but I also will get bios overclocking failed warnings when restarting. I know a prerelease bios comes with some inherent risks, I just hope I didn't damage my hardware.

I am currently running an overclock that the AI suite 3 generated, 3.875ghz at 1.28v (stock) until the official release. It is barely touching 54c with these setting and it is stable for 2 hours in realbench stress.

I am using the Kraken x61 liquid cooler.
post #7864 of 17070
Quote:
Originally Posted by pantsoftime View Post

Not a good day so far. Having a new problem. With 1002 I really had no problems with DOCP standard and 3200MHz (Flare-X memory). With 0079 and 0081 I have a problem where it works fine until I shut down. If i cold power cycle (i.e. turn the PSU off), it never comes up. It bootloops until it falls back to 2400MHz. I didn't have this problem with 1002. I tried adjusting some voltages and saw no improvement.

Anyone have any suggestions? I've seen this issue reported earlier in the thread with older BIOSes but this is my first experience with it recently.

I had a couple issues related to this today and ended up bumping my dram vboot to 1.4 and it seems to be happy (for now). 1002 was much more stable in this regard for me. SilentDeath posted some training methods a few pages back that might help you out (I havent used it yet but might give it a shot to get cas down to 14 again).

On another note, I was checking DPC latency for giggles and was initially amazed at how much lower it was than my Intel build but at around 40 seconds in (and subsequently every 40ish seconds), it gets a huge spike from acpi.sys. I hadn't checked it previously so I don't know if it related to this BIOS or if it was always present.

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post #7865 of 17070
Quote:
Originally Posted by SwiperNoSwiping View Post

What setting would you say is too high though? is 80 ohm that people here achieving good results with okay?

Hello

In the absence of test equipment and software to model the circuit let stability be your guide. The purpose of adjusting ODT values is to minimize reflections along the transmission line. The closer the set resistance is to matching the impedance of the circuit the more the reflections are reduced and related memory stability increased. An added benefit as the termination resistance reaches the ideal point is all current is sinked by the resistance resulting in zero overshoot/ringing associated with impedance mismatch.
post #7866 of 17070
Using DOCP 5 managed to boot to Windows! Can't run hyperPI mind fails straight away.
Warning: Spoiler! (Click to show)
xrBT8az.png
post #7867 of 17070
Since everyone is more interested in memory than temps, here is my little contribution. Using 1001/0079/0081 I have no problems booting 3200-14-13-13-13-34, also did over 6 hours of Realbench without errors. But once I increase BCLK to increase memory frequency things get problematic quickly. Using 0079/0081 it often happens that the system boot into Windows using 2200-CL15 instead of what I set in BIOS. Need more time to play around.
post #7868 of 17070
So, after doing a legitimate windows installation all my issues seem to have gone, it obviously was the cracked one I wanted to test with prior to the real deal, big mistake. No more code 8 errors, nada, has been rock solid, gaming doesn't budge the chip over 40c and under ibt it won't go over 52c, mind you, this is completely stock.

One thing though, since I turned off the core performance my cores do not go over 3.6. Nothing, not 1, not 2, it goes from 2.0 to 3.6. It does this in balanced and high performance.
Any ideas?

Cpu is an 1800x.
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post #7869 of 17070
bios 1002

4x8GB TridentZ at 3200C14 pretty stable. One set is 3733C17, other one is 3600C17.
3200 divider doesn't POST at CAS lower than 18 (or 17 set in bios, which is rounded to next even number).
2666 divider is fine with lower CAS, despite tighter subtimings.
Haven't tried lower VDIMM, might run just fine.

Memtest 100%


Blend custom, just 30min, don't want to torture this cpu a lot, since I have only one and plan to bench it on LN2


Aida


bios 0082
2x8GB TridentZ 3733C17 running at 3600C12

VDIMM 1.60V
VSOC 1.11V
VDDP 1.20V
VPLL 1.70V



Should spend some time this weekend to optimize windows for Pi.



PS: You can see some key voltages used. Nothing else helps in my testing.
Obviously VDIMM is needed, depending on quality of sticks, timings, frequency, etc.
VDDP helps stabilize memory (IMC maybe?)
VSOC only needed for Infinity Fabric, so when pushing really high clocks it needs to be raised a little, since it is running in sync
VPLL is lower than default, helps boot at high mem and bclk.


The strange thing is lowering PLL leads to lowering the temperature reading. At 1.7V I now have -15 tDIE on air. @elmor, can you look at this.
I will test more to see if it depends on something else.
post #7870 of 17070
To Get to 4GHz on my 1700 is it better to raise Blck or core ratio?
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