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Skylake Overclocking Guide [With Statistics] - Page 924

post #9231 of 11364
honeslty i dont have that capability on my mobo but i believe that will give you headroom for overclocking via the bclk. it's said that you only need to pull fclk back to 800 only when setting bclk over 190 but i'm sure with all mobo's thats not the case.... having a setting in bios for 1250 almost seems to say it is for underclocking the bclk...


BTW i'm yet to see a reason for needing to o'c the bclk above 102-103 given that only a couple points will get you to the next 100Mhz level unless you have a sweet in-the-middle spot for your RAM
post #9232 of 11364
BCLK@125MHz x10 = FCLK@1250MHz
So far its working. Thanks for the reply.
     
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post #9233 of 11364
Here is my submission on my first round of stress testing, this on the delidded 4.7 SiliconLottery.com cpu (it was rated at 1.408 or less with realbench 1 hour test by SL):

Username: markm75
CPU Model: 6700k
Base Clock: 100 MHz
Core Multiplier: 47
Core Frequency: 4700 MHz
Cache Frequency: 4100 MHZ
Vcore in UEFI: 1.40 adaptive - 0.008
Vcore: 1.424-1.44v (under P95 blend max)
FCLK: 1000 MHz[

Cooling Solution: Delidded (SiliconLottery.com 4.7 cpu delidded before shipped)
-Thermaltake 3.0 Ultimate Riing 360mm
Stability Test: Prime 95 27.9 Blend 24 hours 87C max temp (NOT using the local.txt mod CpuSupportsFMA3=0) ambient 24C
Typical Max temp in games/Prepar3D is more like 67-70 at best.
Batch Number: X623c611 ("siliconlottery 4.7")
Ram Speed: 3200 (F4-3200C15D-16GVK)
Ram Voltage: 1.41v (XMP)
Motherboard: Asus Z170-a
LLC Setting: 6
Misc Comments: CPU Capability 110%, VCCIO/System Agent 1.20v (can also achieve by doing LLC4 CPU cap140, with volts 1.42 + 0.016), overall temps with p95 may seem high, but thats with avx going on, volts were higher than i was hoping for, but its rock stable 24 hours and thats gold in my book.

**during testing i had igp on, despite using 1080 gtx ftw hybrid.. i may retest with igp off to see if i can lower things.

http://valid.x86.fr/21n4lz

Edited by markm75 - 10/6/16 at 7:48am
    
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post #9234 of 11364
I'm conflicted on pushing the voltage beyond 1.35V. This guide recommends that as the limit and warns of electromigration.
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Keeping the cores under 80C is pretty easy but I'd like to avoid damaging the CPU for a small gain. Does anyone know why the recommendation here is so low compared to others saying 1.5V can be safe?
post #9235 of 11364
Quote:
Originally Posted by darko313 View Post

I'm conflicted on pushing the voltage beyond 1.35V. This guide recommends that as the limit and warns of electromigration.
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Keeping the cores under 80C is pretty easy but I'd like to avoid damaging the CPU for a small gain. Does anyone know why the recommendation here is so low compared to others saying 1.5V can be safe?

All that I can tell, you shouldn't have much of an issue at or around 1.35V. even if you're like 1.380v as long as temps are good you should be fine. Based on stats, there's a bunch of people overclocking well over 1.350v and we've had sky lake what a year now? No issues..TMK

I'm personally at 1.348v max under load and I can get 4.5Ghz, keeping it under 70C in prime...that keeps me happy. I'm sure that'll last me many many years. I just limit my stress testing knowing that I'm stable and I'm good to go.
post #9236 of 11364
Quote:
Originally Posted by darko313 View Post

I'm conflicted on pushing the voltage beyond 1.35V. This guide recommends that as the limit and warns of electromigration.
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Keeping the cores under 80C is pretty easy but I'd like to avoid damaging the CPU for a small gain. Does anyone know why the recommendation here is so low compared to others saying 1.5V can be safe?
They said the same with Sandy Bridge. I had my 2500k @4.9 1.48v almost 24/7 for over three years.
And it is still running.
Overclock the **** out of your hardware i say. smile.gif In three years, you will upgrade anyway.
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post #9237 of 11364
Quote:
Originally Posted by Falcy View Post

They said the same with Sandy Bridge. I had my 2500k @4.9 1.48v almost 24/7 for over three years.
And it is still running.
Overclock the **** out of your hardware i say. smile.gif In three years, you will upgrade anyway.

I agree. The only degradation I've seen in the past few years has been Haswell-E cache, otherwise I haven't seen any core clock degradation from Sandy onward. I have a 2500K that's been running 1.52V @ 5.2GHz for over 5 years now 24/7, still a champ like day 1, still passes P95.
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post #9238 of 11364
I recently jumped the wagon, sold my 4790k z97 and 16gb ddr3 2666 RAM for $400 to a friend, and now I got a 6700k, Gigabyte Z170 Gaming Ultra motherboard, and 16gb DDR4 3200 CL14 gskill RAM on the way (Will be here this Thursday thanks for USPS messed up my delivery and had to reorder, total paid $500). Hopefully I can achieve good result with my 6700k, x612c188 batch. redface.gif
    
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post #9239 of 11364
I just got a Maximus VIII Hero to replace my AsRock Extreme6 motherboard (tried two, both had coil whine) and the voltage control has been frustrating to deal with. I had my previous motherboard stable very fast at 4.6GHz and 3400 MHz Ram. I tested them with Prime95 using various tests over a long period of time and no issues ever arose.

I can replicate the same results with this motherboard except for the fact that every other application decides to draw about .1v less than Prime95 now. This causes BSODs and crashes when it decides to go to 1.28v for any high load application from my stable 1.344v. For example, I can't run a simulation program without it crashing every time. Getting frustrated dealing with crappy LLC (LLC1 applying 1.35vcore at +0.005 offset), options that seemingly do nothing or don't have a description on them.

I literally have to choose between Handbrake (and other AVX programs) using 1.34v and other non AVX programs using 1.27v (which crashes) or AVX programs using 1.43v (which is ridiculous) and non AVX using 1.35 to get it stable on every program. I didn't pay 70 dollars more for a motherboard to lose offset and go manual voltage. Is there some option to do away with this voltage disparity?
post #9240 of 11364
Quote:
Originally Posted by Bobber1 View Post

I just got a Maximus VIII Hero to replace my AsRock Extreme6 motherboard (tried two, both had coil whine) and the voltage control has been frustrating to deal with. I had my previous motherboard stable very fast at 4.6GHz and 3400 MHz Ram. I tested them with Prime95 using various tests over a long period of time and no issues ever arose.

I can replicate the same results with this motherboard except for the fact that every other application decides to draw about .1v less than Prime95 now. This causes BSODs and crashes when it decides to go to 1.28v for any high load application from my stable 1.344v. For example, I can't run a simulation program without it crashing every time. Getting frustrated dealing with crappy LLC (LLC1 applying 1.35vcore at +0.005 offset), options that seemingly do nothing or don't have a description on them.

I literally have to choose between Handbrake (and other AVX programs) using 1.34v and other non AVX programs using 1.27v (which crashes) or AVX programs using 1.43v (which is ridiculous) and non AVX using 1.35 to get it stable on every program. I didn't pay 70 dollars more for a motherboard to lose offset and go manual voltage. Is there some option to do away with this voltage disparity?
Hi, try LLC5 (or LLC4) and 1.35v fixed mode first.
If that is OK, then switch to Adaptive mode and longer test for stability, eg something like 1.328v +0.020

Good Luck! smile.gif
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