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Skylake Overclocking Guide [With Statistics] - Page 874

post #8731 of 11364
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Username: iluvkfc
CPU Model: i7 6700K
Base Clock: 125 MHz
Core Multiplier: 38x
Core Frequency: 4.75 GHz
Cache Frequency: 4.75 GHz
Vcore in UEFI: 1.425
Vcore: 1.416
FCLK: 1 GHz
Cooling Solution: Custom loop 360mm+240mm
Stability Test: x264 stress test, 16 threads, normal priority

Batch Number: X602C070 (Vietnam)
Ram Speed: 3000 MHz 15-16-16-35
Ram Voltage: 1.38V (VCCIO 1.2V, VCCSA 1.25V)
Motherboard: Gigabyte Z170X Gaming 7
LLC Setting: High (no numerical option on this board)
Misc Comments: Temps seem pretty high (high 80s under load), I think there's might be an issue with my loop flow which I will investigate, if not then maybe eventual delid. I wanted 4.8 but that was a hair unstable so I'm running 4.75 with 38x and 125 BCLK, this allows me to retain my RAM speed of 3000 MHz with a ratio of 24x and my FCLK speed of 1 GHz with a ratio of 8x. Also I'm wondering if I can reduce my VCCIO/VCCSA/DRAM voltage and whether I will gain any temp decrease from that.
post #8732 of 11364
Quote:
Originally Posted by iluvkfc View Post


Nice to see people using bclk to meet in-between! thumb.gif
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post #8733 of 11364
Quote:
Originally Posted by iluvkfc View Post

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Username: iluvkfc
CPU Model: i7 6700K
Base Clock: 125 MHz
Core Multiplier: 38x
Core Frequency: 4.75 GHz
Cache Frequency: 4.75 GHz
Vcore in UEFI: 1.425
Vcore: 1.416
FCLK: 1 GHz
Cooling Solution: Custom loop 360mm+240mm
Stability Test: x264 stress test, 16 threads, normal priority

Batch Number: X602C070 (Vietnam)
Ram Speed: 3000 MHz 15-16-16-35
Ram Voltage: 1.38V (VCCIO 1.2V, VCCSA 1.25V)
Motherboard: Gigabyte Z170X Gaming 7
LLC Setting: High (no numerical option on this board)
Misc Comments: Temps seem pretty high (high 80s under load), I think there's might be an issue with my loop flow which I will investigate, if not then maybe eventual delid. I wanted 4.8 but that was a hair unstable so I'm running 4.75 with 38x and 125 BCLK, this allows me to retain my RAM speed of 3000 MHz with a ratio of 24x and my FCLK speed of 1 GHz with a ratio of 8x. Also I'm wondering if I can reduce my VCCIO/VCCSA/DRAM voltage and whether I will gain any temp decrease from that.

Probably minimal gain, for me on DC I did see a gain from lowering Vccin but Skylake is different in terms of Vccin and Vcore so no option there for you. I would say you will not see any improvement with lower IMC voltages.
post #8734 of 11364
Quote:
Originally Posted by Deders View Post

It was this paragraph that made me think it was the bug:

"This may seem like Intel's sugar-coating it, but the bug is truly sporadic. Some people have run into it, while others can’t reproduce it. The hang sometimes occurs after minutes, sometimes hours, and others never experience the lockup."

http://www.pcworld.com/article/3021023/hardware/how-to-test-your-pc-for-the-skylake-bug.html

Basically the system freezes up and I have to hold down the power button to restart.

I guess the variables are a newer bios as well as a newer version of prime, but I am reluctant to raise my voltage any more for P95 when everything else is perfectly stable.

yes - back in january we posted the issue both in this thread and in the ASUS z170 thread... and demonstrated that the problem was "fixed" by the microcode update.
The symptom you describe is not consistent with the p95/MC glitch... which was worker failures on 2 specific FFTs. A system freeze like you describe is more likely a cache issue, or possibly ram. Either add more vcore (since core and cache pull from the same voltage rail on z170) or lower the cache multiplier if you have overclocked the cache. thumb.gif
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post #8735 of 11364
Quote:
Originally Posted by Jpmboy View Post

that's sounds more like an undervolt issue. lower the multiplier one notch - still locking up?
And when you say "locks-up" what exactly is happening?

Quote:
Originally Posted by oparr View Post

No, IIRC, lockups were never Skylake bug symptoms only worker errors. Which torture test are you running? If it's small FFTs then chances are the lockups are insufficient Vcore related. If running the default Blend then chances are it's memory related since memory stressing is how Blend starts off. This is just a quick and dirty rule of thumb and exceptions are bound to exist.

It was a blend. Tried downclocking to 45x and no lockup. Have now upped the voltage to 1.405 (from 1.4) which seems to have resolved the issue at 4.6GHz. It boosts up to 1.424v with AVX load which doesn't read any higher than it did at 1.4v, but that's just the 8-bit granularity. When I tried 1.41v, it boosted up to 1.44 for AVX.

Seems very close to the limit. I'm wondering at what point does the reported voltage decide to register it going up a notch. For instance has it actually reached 1.44v, or is it rounding up from around 1.432v (near the middle)?
post #8736 of 11364
Depends on the sensor, for me the increments in HWiNFO are 0.008V with Nuvoton. All of these are estimates, you would need a decent voltmeter and measure it from the board directly to get more precise value. Or even oscilloscope since the values do change fast with different load.
Edited by JackCY - 8/30/16 at 10:13am
post #8737 of 11364
Quote:
Originally Posted by JackCY View Post

Depends on the sensor, for me the increments in HWiNFO are 0.008V with Nuvoton. All of these are estimates, you would need a decent voltmeter and measure it from the board directly to get more precise value. Or even oscilloscope since the values do change fast with different load.

That's what I meant by the 8-bit sensors. For me they go in increments of 0.016v.

I'm going to guess (hope) that they are rounded up. If I put 1.4v into my bios, HWInfo detects 1.408.

Just noticed HWinfo detected a point where it did raise itself to 1.44v under AVX when set to 1.405v.

Can anyone who has used a decent multimeter on an Asus Deluxe board comment on this?
Edited by Deders - 8/30/16 at 10:39am
post #8738 of 11364
Dropped my System Agent down to 1.200v and VCCIO to 1.147v. Now I know both somewhat interact with the memory controller, so my best bet for this is testing memory stability? Memtest?

Also, upped my cache clock to 4.3GHz and that seems to be stable also.

Over the next few days I'll be fine tuning my memory timings since now I pretty much know my CPU is stable @ 4.4Ghz. My current timings are 18-20-20-38 for 3200. XMP has those same timings @ 3600 so I'm sure I've got room for some tighter clocks.
post #8739 of 11364
Quote:
Originally Posted by Cakewalk_S View Post

Dropped my System Agent down to 1.200v and VCCIO to 1.147v. Now I know both somewhat interact with the memory controller, so my best bet for this is testing memory stability? Memtest?

Also, upped my cache clock to 4.3GHz and that seems to be stable also.

Over the next few days I'll be fine tuning my memory timings since now I pretty much know my CPU is stable @ 4.4Ghz. My current timings are 18-20-20-38 for 3200. XMP has those same timings @ 3600 so I'm sure I've got room for some tighter clocks.
Or just up vccsa and run the 3600mhz...
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post #8740 of 11364
Quote:
Originally Posted by Cakewalk_S View Post

Actually I'm not sure! I first though it was those values but now I'm pretty sure I wasn't giving my chip enough volts... I'll put them back on auto and see what I get. Maybe my temps will go down some with those volts being lower...
I would be surprised if auto wasn't higher on the vccsa then the 1.25v you set.
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