A typical stable voltage for a 4.6 GHz OC on the i5 4670K is around 1.2 to 1.3 volts.
A typical stable voltage for a 4.6 GHz OC on the i5 4670K is around 1.2 to 1.3 volts.
CPU model: i5 4670K. Cooler: NH-U9B. Motherboard: Asus Z87-A. Power supply: OCZ Technology 700W 80 Plus Silver. Current stable speed is around 4.5GHz at 1.3V peak with temperatures around 83°C and lows near 42°C during rendering. Bios settings are set to 4.5GHz. I aim to reach 4.6GHz but am unsure about the right voltage. Some users report success at 1.22V, though stability remains a concern. I increased voltage incrementally before crashes, reaching up to 1.36V, but temperatures peaked near 97°C on all cores. The best results were around 1.32V, surviving ten renders without crashing. For a stable 4.6GHz, try boosting the voltage by small increments in BIOS and monitor temps closely. If you need more details or have further questions, feel free to ask.
Possible answer: The temperature of the CPU cooler is probably too low. You might attempt reapplying adhesive and boosting the cooler's mounting force.