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ROG Crosshair VI overclocking thread - Page 1278

post #12771 of 17325
Quote:
Originally Posted by gtbtk View Post

Stable?

What is the latency that you can achieve with those timings?

Testing now for stability. thumb.gif
post #12772 of 17325
@S1L3N7D3A7H

RAM training/boot process differs IMO, within the 3 cases below.

i) restart system from OS.

ii) boot system from shutdown where power was active to PSU.

iii) boot system from shutdown where power was deactive to PSU.

On my rig (i) never an issue, (ii) very intermittent issue, I can have without error boots for many number of boots, (iii) always an issue.

@finalheaven

I will try SOC: 1.0V, but I believe it will mask a FW issue which maybe there. I can pass so many stability tests at 0.975V then to me the failure to boot correctly/cleanly is something that occurs at boot, like a FW issue.

@ibeat117

That boost to CB bench with PB is not to be sniffed at wink.gif . Do some benches without PB and at say 3.7GHz, 3.8GHz and 3.9GHz with same RAM and see how bench scales wink.gif . Then you will see the enhancement with PB CB15 is good smile.gif .
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post #12773 of 17325
Quote:
Originally Posted by gupsterg View Post

And are "we" saying training failure has nothing to do with firmware?

Same settings on 1002, where I believe fail_CNT is 3 (which we can't change in that UEFI) it will do 3x posts after a F9 q-code boot ie memory training issue and then be AOK . I will be trying fail_CNT on newer UEFI.
NP smile.gif , cheers for info.
Enable Performance Bias CB15 in UEFI. I can match your bench at 3.8GHz/3200MHz with PB CB15 wink.gif
Warning: Spoiler! (Click to show)
0ff51c05_3200MHzCB.jpeg
Link OP of my thread has instruction on manual install if it fails to install.

If only happening on cold boot, you should be able to dial this out. Firmware will make a difference depending on what rules change.
post #12774 of 17325
Quote:
Originally Posted by gupsterg View Post

@S1L3N7D3A7H

RAM training/boot process differs IMO, within the 3 cases below.

i) restart system from OS.

ii) boot system from shutdown where power was active to PSU.

iii) boot system from shutdown where power was deactive to PSU.

On my rig (i) never an issue, (ii) very intermittent issue, I can have without error boots for many number of boots, (iii) always an issue.

@finalheaven

I will try SOC: 1.0V, but I believe it will mask a FW issue which maybe there. I can pass so many stability tests at 0.975V then to me the failure to boot correctly/cleanly is something that occurs at boot, like a FW issue.

@ibeat117

That boost to CB bench with PB is not to be sniffed at wink.gif . Do some benches without PB and at say 3.7GHz, 3.8GHz and 3.9GHz with same RAM and see how bench scales wink.gif . Then you will see the enhancement with PB CB15 is good smile.gif .

I hope you're right and that eventually we can go back to lower SOC. But betting that Asus will concentrate on the May update with ram first.

Is disabling core performance boost necessary? I left both core performance boost and C-States on default which is auto I believe.
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post #12775 of 17325
@Silent Scone

And like I said before I have tried ProcODT, which Raja@ASUS, Praz, Elmor stated, 2x linked a graphic of test results. I have taken SOC from stock 0.875V > 0.950V > 0.975V and will try 1.0V smile.gif .

I am not upset at all with "issue".

I am not concerned at all with "issue".

As I can use "Sleep/Resume" and mobo does do a post loop in this case, but again a differing "boot" process. I'll find the posts by raja@ASUS.

I am just highlighting so "we" see some improved FW based on feedback.

2933MHz not an issue. I just ordered a 3rd CPU for testing on all same HW smile.gif .
Quote:
Originally Posted by finalheaven View Post

I hope you're right and that eventually we can go back to lower SOC. But betting that Asus will concentrate on the May update with ram first.

Is disabling core performance boost necessary? I left both core performance boost and C-States on default which is auto I believe.

It is necessary to disable if you are using PState OC in UEFI IMO.

CPB [Auto] or [Enabled] allows CPU to use PB/XFR at boot/UEFI.

So let's say as you use a R7 1700, PState 0 shows 1.1875V and you add an offset of +200mV to gain stability. The 1.1875V is ceiling VID of PState, when AMD CBS is reset from memory training failed boot, the offset is not reset on Extreme Tweaker page.

You will see in default state CPU can use ~1.35V, due to PB/XFR. So as that offset did not reset your CPU will get ~1.55V. I have have measured with DMM.

Now when CPB is off and memory training fail, your CPU can only go to 3000MHz. On my R7 1700 it uses ~1.000V measured by DMM, if I was using a +200mV offset for my 3.8GHz OC and memory training fail boot happened then it will only go to 3GHz, use ~1.000V + 200mV = ~1.2V.

Now for any X CPU owner read @majestynl post.

On a memory training failed boot where he has PState OC in UEFI he will see ~1.6V. But with CPB off it's ~1.26V.
Quote:
Originally Posted by majestynl View Post

2. Yes, i tested your method. It was also working for me, with a failed boot > Bios Recovery mode: my vcore was around 1.256v and not ~1.6v. Thats when i saw the CPB option on both pages. Thanks for the hint thumb.gif

Edited by gupsterg - 4/30/17 at 11:25am
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post #12776 of 17325
Quote:
Originally Posted by Naeem View Post

i was unable to get anything more than 3.8ghz i will have to test and see

You can also try deactivating Super Clock IO Skew under Onboardsettings in UEFI, this helped me
post #12777 of 17325
Thread Starter 
Quote:
Originally Posted by S1L3N7D3A7H View Post

@elmor

Just tried increasing my SOC to 1.0v and my DRAM boot to 1.4v and my Fail Count Retry to 3.

I can simulate the failed boot by shutting down and removing power and letting system de-energize. Re-apply power and power on. System will boot, shutdown and restart about 4 times. I then load up BIOS and my memory is back to 2133 and AMD CBS settings are lost.

I don't have any reason to suspect any instability in my settings. This seems to be an issue that has stuck around from the earliest BIOS'.

It's a well known problem with this platform. Currently we're hoping for a solution in the final May update from AMD. Until then, you can try the 0003 BIOS I posted here http://www.overclock.net/t/1624603/rog-crosshair-vi-overclocking-thread/10300_100#post_26031379 . It will update the on-board microcontroller to a version which always starts with 90 MHZ refclk and 1.35vdimm even when performing a "cold boot". After updating you can flash back to any of the previous version which worked well for you and this fix will still be in place, just make sure you set refclk manually to 100 MHz (don't leave it Auto) or you might end up booting all the way with 90 MHz.
post #12778 of 17325
Quote:
Originally Posted by elmor View Post

It's a well known problem with this platform. Currently we're hoping for a solution in the final May update from AMD. Until then, you can try the 0003 BIOS I posted here http://www.overclock.net/t/1624603/rog-crosshair-vi-overclocking-thread/10300_100#post_26031379 . It will update the on-board microcontroller to a version which always starts with 90 MHZ refclk and 1.35vdimm even when performing a "cold boot". After updating you can flash back to any of the previous version which worked well for you and this fix will still be in place, just make sure you set refclk manually to 100 MHz (don't leave it Auto) or you might end up booting all the way with 90 MHz.

Lets all cross our fingers for higher memory straps as well.
post #12779 of 17325
Really has been far easier than I could have hoped!

4ghz on 1700 at around 1.44v, 3ghz on my 64gb predator, pstates working nicely, and have tested with occt linpack avx for an hour.

Temps didn't go over 61c.

Really pleased it went so well. Can now hopefully forget about fiddling for a while!
post #12780 of 17325
AMD stated that they'll increase memory speed without the need to use refclk. I'm hoping they give us 3600 at least. That and I hope my B-Die chips can do 3600 easily. And of course better ability to use 4 dimms.
Quote:
Finally, as part of AMDs ongoing development of the new AM4 platform, AMD will increase support for overclocked memory configurations with higher memory multipliers. We intend to issue updates to motherboard partners in May that will enable them, on whatever products they choose, to support speeds higher than the current DDR4-3200 limit without refclk adjustments.
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