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Skylake Overclocking Guide [With Statistics] - Page 921

post #9201 of 11364
EXPLANATION
UNCORE (= not core, not CPU) is easy to set. This post is valid for Skylake 6600k / 6700k on any motherboard (Gigabyte, Asus, etc.). Among other things, the Uncore Ratio relates to the frequency of the cache used by the CPU. And you have to manually set the Uncore Ratio in the BIOS of the motherboard because it remains stuck at the stock ratio of 35 (3.5 GHz) even after you have overclocked the CPU Clock Ratio way above that. To do that my Gigabyte z170 motherboard WRONGLY indicates to set the Uncore Ratio equal to or higher than CPU clock ratio. Why wrongly?

Think about it. The cache is a slave sub-process working for the CPU core master process that it is meant to assist by temporarily storing transient CPU data. Understandably, if you make the slave faster than its master, it will cause problems (!). So the BIOS should rather indicate to “set the Uncore ratio equal to or LOWER than CPU Clock Ratio”. That’s why it is perfectly stable when you leave it at its stock ratio of 35 (3.5 GHz) even after you have overclocked the CPU Clock ratio way above that (the Uncore Ratio is then much LOWER than the CPU Clock ratio). But then the cache (slave) lags considerably behind and puts a brake on the CPU (master) which is then badly in need of an assistant that can keep up with its much higher overclocked ratio. The master has no time to wait for the slave… which leads to timing problems. Doesn’t this make a lot more sense?

At stock values, both the CPU ratio and the Uncore ratio are set at 35 (3.5 GHz) and that’s very stable as, being that low, the frequency remains stable within tolerances. But after overclocking, the frequency starts to vary a lot more and the Uncore (slave) ratio can briefly peak (too much) above the CPU (master) ratio which often causes a blue screen with (of course) a timing error like “CLOCK_WATCHDOG_TIMEOUT”. At 4.5 GHz, my CPU Clock varies between 4495 and 4504 (not perfectly 4500). To avoid it, simply set the Uncore Ratio just ONE NOTCH BELOW (as often with overclocking) the CPU Clock Ratio. For example, if your CPU Clock Ratio = 45 (4.5 GHz), then set Uncore Ratio = 44 (one under). That way the Uncore Ratio will always stay BELOW the CPU Clock Ratio.

As a bonus, on 4.5 GHz, I also noticed via CPUID HWMonitor that VCore stayed at 1.332 V Max. So I reduced VCore in the BIOS from 1.35 V to 1.34 V and got less heat and lower power consumption.

CONCLUSION
Having reached a stable overclock with all green after 2 H on Prime95, boost performance by setting the Uncore Ratio just ONE NOTCH BELOW the CPU Clock Ratio you reached. For example, at a stable CPU Clock Ratio = 45 (4.5 GHz), set Uncore Ratio = 44 (one under). Next, as an extra bonus, reduce the VCore in the BIOS, for example from 1.35 V to 1.34 V. If you no longer get all green after 2 H on Prime95, come back to the previous VCore in the BIOS, for example from 1.34 V back to 1.35 V.
post #9202 of 11364
Quote:
Originally Posted by zeeee4 View Post

how about you do a stress test. Use intel extreme tuning utility stress test for a couple hours and youll know if youre stable. If you are then thats an amazing fkin oc and you got really lucky. I can get like 4.7 on 1.37-1.40v still testing, but if i move to 4.8ghz i gotta crank it all the way up to 1.45-1.47 ish range gotta find stability there also

IBT at Max for 20 passes/ three hours would be more of a stress test, or Realbench using all RAM for five hours.
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post #9203 of 11364
for those who overclock should buy that Intel overclock insurance it cost 30.00 dollars. And in my opinion PSU most important factors are longevity and the best quality of power. That will make your components last at a lot longer.
Edited by sonicboom19 - 10/1/16 at 8:20am
post #9204 of 11364
Sorry if I'm asking dumb question...

So I'm trying to overclock my memory. Overclocked my cpu to 4.5GHz, but I just can't pass Memtest86 on STOCK ram speed.
I already pass x264 7 hour and IBT 30 minutes with 4.5GHz and stock ram speed.

CPU: 6600k@4.5GHz (Offset +0.015)
MB: ASUS Z170-A
ram: Kingston FURY 16GB (2 x 8GB) DDR4-2666 (HX426C15FBK2/16)



Um...Any suggestion? should I change a stress test?

EDIT: I tried 15GB, 12GB, 8GB, 4GB test, all crash after around 14minutes run.
Edited by KawasakiDragonn - 10/1/16 at 8:20am
post #9205 of 11364
prob need more info

but bump your ram volts in bios by a notch or two
Edited by MattBaneLM - 10/1/16 at 8:23am
post #9206 of 11364
Thanks for the reply. here's all the information I can gather now

CPU Model:6600K
Base Clock: 100Mhz
Core Multiplier: 45
Core Frequency: 4500MHz
Cache Frequency: Auto (3900Mhz)
Vcore in UEFI: Offset +0.015V
Vcore: x264:1.301V IBT:1.366V
FCLK: 1000MHZ
Cooling Solution: Not delidded, Cryorig H5 Universal

Ram:Kingston FURY 16GB (2 x 8GB) DDR4-2666 (HX426C15FBK2/16)
Ram Speed: XMP profile#1 (2666 15-17-17-35)
FCLK : RAM speed : 100:133
Ram Voltage: 1.2000V
System Agent Voltage: Auto (1.216V)
VCCIO:Auto (1.128V)

Motherboard: Asus Z170-A
LLC Setting: Level 2
Edited by KawasakiDragonn - 10/1/16 at 8:52am
post #9207 of 11364
Quote:
Originally Posted by KawasakiDragonn View Post

Thanks for the reply. here's all the information I can gather now

CPU Model:6600K
Base Clock: 100Mhz
Core Multiplier: 45
Core Frequency: 4500MHz
Cache Frequency: Auto (3900Mhz)
Vcore in UEFI: Offset +0.015V
Vcore: x264:1.301V IBT:1.366V
FCLK: 1000MHZ
Cooling Solution: Not delidded, Cryorig H5 Universal

Ram:Kingston FURY 16GB (2 x 8GB) DDR4-2666 (HX426C15FBK2/16)
Ram Speed: XMP profile#1 (2666 15-17-17-35)
FCLK : RAM speed : 100:133
Ram Voltage: 1.2000V
System Agent Voltage: Auto (1.216V)
VCCIO:Auto (1.128V)

Motherboard: Asus Z170-A
LLC Setting: Level 2

tips-
monitoring - try aida 64
stress testing ram- prime95, occt,
overall system - realbench
with ibt run very hard for 30 loops
(to name a few)

what is your xmp voltage rating for your ram?
does it work at auto settings?
set fclk to 800 for now
post #9208 of 11364
Quote:
Originally Posted by sonicboom19 View Post

for those who overclock should buy that Intel overclock insurance it cost 30.00 dollars. And in my opinion PSU most important factors are longevity and the best quality of power. That will make your components last at a lot longer.

http://click.intel.com/tuningplan/purchase-a-plan

That is hilarious, I have never heard of that before haha.
post #9209 of 11364
Quote:
Originally Posted by MattBaneLM View Post

tips-
monitoring - try aida 64
stress testing ram- prime95, occt,
overall system - realbench
with ibt run very hard for 30 loops
(to name a few)

what is your xmp voltage rating for your ram?
does it work at auto settings?
set fclk to 800 for now

Thanks for the tips!

Well I set XMP profile in bios, it locks my RAM voltage to 1.2012(not Auto, world's not gonna end). I changed to Auto and it seems to stay at 1.2V

Now I set FCLK to 800, ram at 2666 XMP setting(2666 15-17-17-35), CPU offset+0.015,leave rest on Auto (RAM voltage auto)
I can pass Prime95 blend test for 30 minutes. One worker FATAL fail after 2 minutes, not sure if it means very unstable or just a minor error...




guess change FCLK to 800 stables whole system.
Edited by KawasakiDragonn - 10/1/16 at 7:08pm
post #9210 of 11364
clearing the thread of failed attempts, sorry
Edited by DeathAngel74 - 10/2/16 at 10:31pm
     
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CPUMotherboardGraphicsGraphics
Intel Core i7 7820X 4.5GHz/3200MHz mesh @ 1.1v Asus STRIX X299-E GAMING  eVGa 1080 Ti 11GB FTW3 HYBRID 2037/12000MHz PhysX Card: eVGA 1070 SC2 2037/9000 
RAMRAMHard DriveHard Drive
Corsair Vengeance RGB 32GB DDR4-3200 Corsair Vengeance LPX Black 32GB DDR4-3200 Samsung 960 EVO 250GB M.2-NVMe SSD - Windows/Boot OCZ TRION 150 480GB 2.5" SSD - Games(RAID0) 
Hard DriveCoolingOSMonitor
OCZ TRION 150 480GB 2.5" SSD - Games(RAID0) Thermaltake Water 3.0 Riing RGB 360 AIO LCS Windows 7 SP1 Ultimate 64-bit LG 47LN5400 47in. HDTV @ 120Hz 
KeyboardPowerCaseMouse
Razer Ornato Chroma Thermaltake Toughpower DPS G RGB Titanium 1000W... Thermaltake Core X31 RGB Razer Deathadder Chroma 
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Razer Firefly Chroma Samsung K360 Soundbar+Subwoofer 
CPUMotherboardGraphicsRAM
AMD A6-7310 2.00GHz Dual-core HP POS AMD Radeon R4 4GB  
Hard DriveOptical DriveCoolingOS
Some POS 240GB SSD More HP junk Stock Windows 7 SP1 Ultimate x64 
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