Asus maximus VIII Hero : cannot set gskill memory to certified tested speed

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gdkenny

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Hi,

i'm trying to set the frequency to 3200MHz in the bios, without success.

the memory is working with the SPD parameters (1.2V,2133MHz), but not with the certified 3200MHz.

here is my config:

asus maximus VIII Hero (latest bios)
i7 6700K
gskill ripjaws V 2x8Go 3200MHz
http://www.gskill.com/en/product/f4-3200c16d-16gvk


I didn't forget to increase the voltage to 1.35v as specified in the gskill specs for achieving 3200MHz.

The behavior is random : Sometimes the system boot(rarely), but most of the times it don't

When the system don't boot, i got the error 55 (memory not installed) on the MB leds.

When the system boot,
i can check the 3200MHz in cpuZ, and i can even run Prime95(v26.6) without error on a small torture test (6mn on small FFTs).

But on the next boot, i got the error 55, and after that the bios prompt:

"overclock failed, F1 for entering BIOS..."

I hope it's because i miss some changes in the bios...


-i did increase the DRAM voltage, but not the CPU VCCIO or the CPU System agent Voltage.
-Maximus tweak is on auto, which default to mode 2
-I did not change the timings, and they are set to something like 18,18,18,36.(Certified for 16,16,16,36)

I wonder, maybe i should OC the cpu, and let the dram frequency scale automatically?

Anyway i don't think it's normal not to achieve the certified frequency what do you think?
 
Solution
JackNaylorPE
XMP is Intels eXtreme Memory Overclocking profile. All XMP profiles are "overclocks" and are not in compliance with the JEDEC standard. For whatever reasons, RAM vendors advertise their RAM for the speed that it can run "overclocked". In order to run "overclocked" it need various Motherboard adjustments to be made. Rather than have you make dozens of manual edits, the BIOS, automatically makes all these changes when you enable XMP.

Yes, you can do all these manually, but if you are going to use XMP memory, you are not using the "default" SPD, so why go with the default MoBo settings .... if you want to use the XMP SPD, then use the XMP BIOS setting.
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JackNaylorPE

JackNaylorPE

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You **should** be able to run at XMP settings simply by increasing the RAM voltage.... if CPU is overclocked via CPU multiplier this will not affect RAM speed. Also if CPU is overclocked, might need another 0.05 volts or so.

You should not have had to make any BIOS changes other than setting XMP. If overclocking CPU, a voltage boost on DRAM would likely be req'd. Did you do that or set primary timings manually ?

Remember that we're still on the initial MoBo / CPU steppings so these kinda of things will occur less in the next few months as they catch bugs and teak things with newer version boards / CPUs.

Id forget about Prome95 as it's relevance to overclocking has ling since faded.

1. Don't see value to testing w/o AVX, SSE2, etc when real world programs use those extensions. Kind alike torture testing your off road vehicle in 2WD. You have proved stability w/o those extensions, so what happens when you run programs with those extensions.

2. Testing with the newer versions of P95 proves that your OC is low enough that it can run stable under conditions it will never see again in its life. So an OC that would have run at 4.8 just fine with every program you could throw at it is limited to 4.6 Ghz because of a synthetic utility that you will likely never run again.

3. I have had P95 stable OC's fail under application benchmarks proving that P95 stability does not mean multitasking stability.

To address the memory issue, Memtest86+ is the tool that you should put to use.

If XMP is enabled and everything else at stock settings it should work... if it doesn't, I'd call GSkill / Asus

 
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gdkenny

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-CPU is not OC.
-I did not change the memory timings, just boost the DRAM voltage.

About your 3 : good to know. I would not have guessed it was possible. But you're absolutly sure the crash was not caused by some stuff not tested by P95?
P95 don't use much in v26.6
i mainly used P95 for a temperature test with CPU not OC for knowing the "100% load base temperature"

I did not enable XMP. Default was not enable, so i let it. I saw later on the specs that the memory is OK with that.
So, in a nutshell, what is your advise?

-Set the DRAM to 1.35v
-Enabled XMP.

That's it?

i just saw on a maximus VIII OC guide that VCCIO is important for memory OC.
http://www.mediafire.com/view/s1d3wtulam1bku7/ocguide0722c.pdf

I don't know that is this XMP setting, i will dig into that.

UPDATE:

http://www.anandtech.com/show/8959/ddr4-haswell-e-scaling-review-2133-to-3200-with-gskill-corsair-adata-and-crucial/3
if the capability of the memory deviates in any way from specified JEDEC timings, a manufacturer must use an XMP profile.

Thus it is important that the user enables such a profile! It is not plug and play!
Click to expand...

Ok, i'm a joke. I will definitely enable it and see if it solve my problem.
 
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JackNaylorPE

JackNaylorPE

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XMP is Intels eXtreme Memory Overclocking profile. All XMP profiles are "overclocks" and are not in compliance with the JEDEC standard. For whatever reasons, RAM vendors advertise their RAM for the speed that it can run "overclocked". In order to run "overclocked" it need various Motherboard adjustments to be made. Rather than have you make dozens of manual edits, the BIOS, automatically makes all these changes when you enable XMP.

Yes, you can do all these manually, but if you are going to use XMP memory, you are not using the "default" SPD, so why go with the default MoBo settings .... if you want to use the XMP SPD, then use the XMP BIOS setting.
 
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Solution
JackNaylorPE

JackNaylorPE

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Check the Overclock3D article. Gotta give Asus credit for reversing a trend here ..... the VIII is no where near the gaming disappointment the VI and VII were.

http://www.overclock3d.net/reviews/cpu_mainboard/asus_rog_z170_maximus_viii_hero_review/3

For the combined clock we went with 21x 230BCLK for a 4830 MHZ max CPU clock, with the memory also overclocked at 3677MHZ and the CPU Cache running at a hefty 4600MHz. This will be the speed we'll use in our overclocked results.
Click to expand...
 
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gdkenny

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Yeah, well, the system is not stable after all. I got the old "memory not installed" error crash in game.

The XMP profile didn't tweak the VCCIO & VCCSA voltages, i will give it a go, and maybe some memtest too.
 
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