The Intel i5 8600K is limited to a maximum of 4.3 GHz.
The Intel i5 8600K is limited to a maximum of 4.3 GHz.
Hi,
I’m facing some difficulties with overclocking. When I manually set the CPU to 4.7 Ghz (Air Cooler), Prime 95 remains stable, but benchmarking fails since the software crashes. I lowered the multiplier to 4.4 Ghz and still encounter the same issues. Using the Enhanced Turbo feature helps—when all cores are at 4.3 Ghz (Max Turbo) everything functions properly.
Could this be related to a BIOS setting, or is it my graphics card that’s causing the trouble? It seems quite old. Additionally, I experience the same problem when XMP is enabled. Any advice would be appreciated. Games crash if I push the CPU beyond 2133 Mhz.
PC Specifications:
CPU: Intel i5 8600k
RAM: 16 GB Gskill Trident Z RGB 3200Mhz
Motherboard: MSI Z370 Gaming Pro Carbon
GPU: Asus GeForce GTX 760 DC2OC 2GB
PSU: Corsair RM650 80+ Gold Certified
MSI Click BIOS 5 Settings:
OC Explore Mode: Expert
CPU Ratio: 47
CPU Ratio Mode: Fixed
CPU Ratio Offset (AVX): -3
CPU Core Voltage: 1.320
CPU SA Voltage: 1.200
CPU IO Voltage: 1.200
DRAM Voltage: 1.360
CPU Loadline Calibration Control: Mode 4
Intel C-State: Disabled
From my understanding of Asus, frequently using this board manufacturer's OC process can enable maximum LLC settings, which may lead to voltage spikes on your CPU and could potentially harm it. This approach is not advised.
The VCore displayed under default settings/clock rates is what you observe. It's recommended to aim for 4.5Ghz but begin with a consistent OC of 4.3Ghz across all cores. The voltage applied for the above frequencies was likely 1.32V, though this might be insufficient; proceed with caution.
This should work well for a 4.7GHZ overclock, and the VCore you're using looks suitable. Begin with a 4.5GHZ overclock using your existing settings, then run Prime95 version 26.6 and monitor temperatures. If temps stay between the 50s to 60s Celsius, increase to 4.6GHZ and repeat. Once stable, gradually reduce the VCore in tiny steps to find a safe 4.6GHz at the lowest VCore. Test at 4.7GHz next, then try 1.325V... You should be able to stabilize around 1.3V, though some may push it higher to 1.4 or more. It’s generally safe up to 1.35V, but others go all the way to 1.4.
vMax :
Okay, that should be okay for a 4.7GHZ overclock and the vcore you are using also seems more than fine.
I would start at a 4.5GHZ overclock with your current settings and then do a run of Prime95 version 26.6 and check temps. If you are in the 50's to 60's degrees C, then move to 4.6GHZ and do the same again. At this point if it is stable, lower the vcore in super small increments to see where you get for a safe 4.6GHz overclock at the lowest vcore. Finally see what happens at 4.7GHz and then try 1.325v... Personally you should be able to stabalise at around 1.3v but sometimes you dont win the CPU lottery and it requires a bit more on the vcore.
You are safe upto 1.35v though others do take it all the way to 1.4...not for me though.
With these settings I could run Prime95 for 30 minutes on 4.7 Ghz. This only thing I cannot do is play games or use for example 3DMark (it crashes a couple of seconds into the first GPU test). If I bring down the frequency to 4.4, obviously it went through Prime95, but I still couldn't play games or benchmark with 3DMark, they would just crash.
The VCore displayed under default settings/clock rates is what you're seeing. It would be better to aim for around 4.5Ghz initially, but begin with a consistent OC of 4.3Ghz across all cores. The voltage values you mentioned were likely set at 1,32V for 4.7Ghz, which might be insufficient; proceed carefully. I won't be home right now, but I'll let you know the details when you check the Vcore settings. Using Enhanced Turbo could help reach 4.3Ghz on all six cores, though manual overclocking doesn't seem to work.
From my understanding of Asus, frequently using this board manufacturer's OC process can enable maximum LLC settings, which may lead to voltage spikes on your CPU and could potentially harm it. This approach is not advised.