OC I7 6700K plus 3200C15 DDR4 memory installed on an ASUS Z170 causes RAM and CPU issues.
OC I7 6700K plus 3200C15 DDR4 memory installed on an ASUS Z170 causes RAM and CPU issues.
Hi Guys,
After several attempts, it seems time for me to ask for your help !
First of all, hereafter my build :
> I7 6700k
> ASUS Z170 Pro GAMING with latest UEFI v1901
> G Kill Trident Z 32Go (16*2) 3200 Mhz CAS 15
> ASUS GTX 1070 ROG O8G
> High End Air Cooling : Be Quiet Dark Rock Pro 3
> Windows 7 Pro
First Step: Get XMP set for DDR4 : Not achieved
The max freq i've been able to reach is 3100 Mhz. No boot with 3200 Mhz set.
Second Step: OC CPU
> 1.35 V / 4.6 Ghz / LLC 5 : Boot but didn't passed the stress test (RealBench)
> down to 4.5 Ghz : Boot and passed the stress test. However, temp did reached 85 °C.
> Last try were : 1.31 V / 4.5 Ghz / LLC Auto : Temp 80 °C
Getting back and out of the UEFI a few times and throug monitoring, I did noticed that voltages do exceed values as manually set.
Example :
> VDRAM set at 1.35 V (as XMP) / it ends up after stress test at 1.368V (the 1.35 are shown in pink color)
> Same for VCPU : set at 1.31. HWMonitor records Voltage up to 1.4V during stress test.
Is this normal/safe ? If it's fluctuates that much, how reliable is the value we set ? Is it considered as the values in idle ? I guess the fluctuation is linked with LLC : what set shall be used ? LLC 5 or LLC 4 or Auto ?
So for DDR4 :
How can I reach 3200 Mhz ? : Shall I play with VCCIO + SAV ? What are max safe volt ? I guess MEMTEST will be required, realbench not being relevant for DRAM.
If not achievable, is 3100 Mhz fine (3100 freq not being sold, by the way. It's either 3000 Mhz or 3200 Mhz) ? should i get down to 3000 Mhz for "safe/efficiency" reasons ? Do 3200 Mhz downgraded to 3100/3000 Mhz performs as well as basic 3000 Mhz kits ?
For CPU:
4.5 Ghz seems to be the sweet spot for me. 4.6 Ghz will need to reach 1.35V+ which raises to much temp.
What about this voltage fluctuation matter ? What LLC value ?
As you might have noticed, i'm not an expert in overclocking, so i shall rely heavily on your advices. Please keep it simple
Thank for reading me and for your help!!
Load the default BIOS settings, install one module, turn on XMP, and compare their performance. Both should function well at 3200; ensure VCCIO and VCCSA are set near +0.1V for optimal operation. A slight increase in VDRAM and VCPU is acceptable, especially during load. Setting LLC to AUTO works fine. If your max is 3100, it's acceptable. You can adjust voltage or timings to get the best results, as a 3200 chip will outperform a 3000.
Hi,
Thank you for your response.
I conducted the test by restarting with just one module. I attempted to increase voltage at 1.25 VCCSA / 1.2 VCCIO, but it had no effect.
It appears that 3100 MHz is my maximum limit. I’m puzzled about this.
By adjusting settings in UEFI, I obtained new configurations:
As discussed earlier, 4.5Ghz seemed to be the issue.
But after a one-hour REALBENCH 2.43 stress test, the temperature rose to 85°C... with a voltage of 1.32V, which is quite high.
After lowering the clock speed to 4.4 GHz, I experimented with BCLK...
It seems I discovered a different path:
44 Core Ratio × 102.5 BCLK = 4.51 GHz
Minimum core cache = 4.2 GHz
DDR4 speed = 3075 MHz
VCore set to 1.315V
FCLK = 1025 MHz
Realbench for 4 hours showed the highest temperature at 81/80/80/81, averaging 76/77°C. Ambient temperature was around 26°C.
Questions:
_ Since my ambient temperature can reach 30°C (+4°C), is achieving a realbench temperature of this acceptable? Or should I reduce BCLK to 102 for safety?
_ Experimenting with BCLK and changing frequency distribution, are the new values affecting DRAM, FCLK and core cache functioning properly? Am I concerned about anything?
_ Could try using 3143 MHz DDR4 since it’s available...
In any case, reaching 4.5 GHz via BCLK for the last 100 MHz, with a 44 CPU ratio, worked better for me (at least from a temperature standpoint) than standard BCLK + 45 CPU ratio.
Thanks a lot ahead of time for your assistance!
Make sure CPU temperature stays below 80°C during peak usage, which should be manageable even with an ambient temperature of 30°C.
These configurations look acceptable, so stability is the priority.
Let us know if you need further updates!