All attempts to increase clock speeds are causing instability.
All attempts to increase clock speeds are causing instability.
Hello, I recently changed my GPU to a GTX 2070 but still face CPU limitations in many games, trying to get more performance from my older processor!
CPU: Intel i5 7600k
CPU cooler: Corsair h100i v2 AIO
Motherboard: Asus STRIX Z270F Gaming
Ram: Corsair 16gb LPX 3000mhz (XMP enabled)
SSD/HDD: WD Black SN850x 2tb
GPU: Nvidia 2070 Rog Strix 8GB
PSU: 650W Corsair VS
Chassis: Corsair Carbide 400C Windowed
OS: Windows 10 64 bit
Monitor: LG 27GL850-B 1440p
I've experimented with several BIOS settings like:
42x, voltage 1.250 (OCCT fail)
45x, voltage 1.275 (OCCT fail)
45x, voltage 1.250 (OCCT fail)
48x, voltage 1.250 (BSOD, no boot)
Each time it fails the OCCT stress test and the CPU tends to hit its maximum at 100% quickly during simple tasks. It only runs smoothly when I enable auto settings, and using the built-in 'Asus Optimal' preset leads to instability.
My CPU + cooler should support a minor overclock, but something seems missing? Any advice would be greatly appreciated.
I recently upgraded my GPU to a GTX 2070 but I'm CPU bottlenecked in a lot of games so trying to squeeze out some extra performance from my old hardware!
Intel i5 7600k
Corsair h100i v2 AIO
Asus Z270-F
Corsair 16gb LPX 3000mhz (XMP enabled)
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.
Speaking of upgrades, did you run DDU to remove all GPU drivers(intel, AMD and Nvidia) in Safe Mode then manually installing the latest GU driver sourced from Nvidia's support site in an elevated command, i.e, Right click installer>Run as Administrator?
Hello, thank you for the update. I tested DDU in safe mode and applied the newest graphics driver using the Nvidia application.
I anticipate achieving around 42x at 1.25V, though you might want to begin a bit lower and gradually increase from 38x. The 7600K can enhance one core up to 4200MHz without requiring an overclock. I haven’t encountered any issues running earlier CPUs (i7-4770K, i5-4670K, G3258) at their turbo boost frequencies across all cores with 1.25V. It’s worth noting that I usually keep the Vcore at its maximum of 1.25V for better longevity.
For testing, turn off XMP and return to the standard JEDEC RAM speed. Without changing the Vcore, set a multiplier of 39x for all cores and observe the results. The BIOS should adjust the Vcore automatically, which should keep the system stable.
Next, increase the all-core multiplier to 40x (without manual Vcore changes) while keeping XMP off. Monitor the Vcore using tools like AIDA64 or HWMonitor; it might rise above 1.20V toward 1.25V. Try raising the multiplier further to 41x, then 42x, but avoid exceeding 1.30V automatically. Check stability each time.
Most BIOS systems are quite cautious and tend to overestimate Vcore increases when you boost all cores. While some users push the 7600K to 1.40V at 48x or 50x, I prefer a maximum of 1.30V for now.
If your setup remains stable at 1.25V with a manual 42x multiplier and no XMP enabled, you’ve set a solid foundation. The system could be stable at 2133 or 2400MT/s JEDEC RAM speeds, but not at XMP 3000MT/s. Which aspect matters more: CPU speed or memory speed?
You may need to adjust the Uncore frequency (if available) to enhance memory stability when increasing the CPU multiplier. There’s often an optimal range you should identify, though I haven’t experimented with it much. Look at what others have done, but keep in mind they might have used "golden samples," removed CPUs, or applied very high voltages.
Hi, I've adjusted the settings to x42 and now hwmonitor displays:
CPU VCORE max 1.296 V
CPU VID max 1.322 V
It looks stable under load but reaches about 85°C in OCCT. Is that acceptable? What should I do next? I aimed for 4.5ghz but it seems I'm already hitting the 1.3V limit. Are these settings quicker than the stock x38 with a 4.2 boost?
I tested it with 1.416 volts for several years using my 7700k at 5Ghz. I also replaced the thermal paste to match the other cores and used semi-custom water cooling. For continuous 4.8Ghz operation, you’d need around 1.35 volts, which matches the VID recommendation—specifically 1.322. The temperature readings at 85°C are acceptable, but stability depends on load line calibration. This helps avoid voltage drops and can raise CPU voltage when load suddenly decreases. Consider adjusting slightly if needed.
So this confirms a minor overclock of about 42x across all cores, as the BIOS automatically raises Vcore to 1.296V.
Then you need to locate the manual Vcore setting in the BIOS (turn off automatic Vcore) and gradually decrease it until the system starts acting erratically.
If you're patient, lower the manual Vcore by small increments—starting at 1,290V, then 1.280, 1.270, etc.—until instability appears.
You might reach close to a manual Vcore of 1.200V at 42x without XMP, though this depends on your CPU quality.
Another approach is to set a manual Vcore of 1.300V (disable automatic Vcore) and raise the multiplier to 43x, then 44x, etc., until stability breaks down.
If 45x or 44x causes instability at 1.300V, try increasing to 1.310V, 1.320V, etc., but cap at 1.350V.
Your choice of Vcore level affects how long the CPU lasts—higher values reduce lifespan. At around 1.400V, a CPU could last roughly three years (just an estimate). At 1.300V it might last four years, while at 1.25V up to five years.
Also keep in mind that excessive overclocking can lead to electro-migration damage after just 18 months at 1.4V. Once that happens, you may need to lower the voltage or revert to stock settings. Check what others recommend for similar setups.