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help
Because each CPU is unique, you should test it individually at 0.01V increments. Starting with a multiplier of 46, begin at 1.30V and decrease by 0.01V step by step. After each adjustment, perform a CPU stress test for at least 10 minutes to verify stability of the operating voltage and ensure the CPU temperature stays below 90°C. Continue this process until you reach a stable voltage, such as 1.23V. Once that's achieved, increase the voltage slightly to the lowest stable value, which in your case would be around 1.24V.
MSI also published a helpful CPU overclocking guide, originally aimed at MSI MoBos but applicable generally. The article includes useful tips:
https://www.msi.com/blog/intel-9th-cpu-o...therboards
It’s worth noting that Anandtech tested with a TRUE Copper heatsink and replaced the thermal paste with solder, achieving impressive results like running an i7-9700K at 4.6GHz with just 1.025V. This suggests strong cooling performance and good overclocking potential. The CPUs likely came from Intel’s test samples rather than standard retail stock.
I recall that in the past Anand has evaluated both review samples and retail chips with minimal variation between them (refer to the 8700K OC article). They also clearly explain their testing procedures in each piece of writing. 0.01V steps are acceptable if you aim for extreme precision, but for starting at a more cautious 1.3V, it's better to begin with a broader setting and let the motherboard auto-voltage provide a solid baseline. This individual achieved 5.1GHz @ 1.2V, matching Anand's results. All 9700K CPUs feature solder TIM, which isn't something Anand performed. I think True Copper—such as Thermalright True Copper in the 120mm tower cooler—is typical, not unusual. Also, cooling shouldn't influence the voltage at a certain frequency; it mainly impacts the highest achievable frequency before thermal constraints are reached.