Clock Frequencies

The following chart shows how well the processor sustains its clock frequency and which boost clock speeds are achieved at various thread counts. This test uses a custom-coded application that mimics real-life performance—it is not a stress test like Prime95. Modern processors change their clocking behavior depending on the type of load, which is why we provide three plots with classic floating point math, SSE SIMD code, and modern AVX vector instructions. Each of the three test runs calculates the same result using the same algorithm, just with a different CPU instruction set.

Overclocking

The Core i5-13400F has its multiplier locked (no "K" suffix). You can technically overclock the base clock (BCLK) to 102.9 MHz, but that will only give you around 3% performance gains at best. Increasing BCLK beyond that limit isn't possible because Intel includes a BCLK counter in their CPU, which will shut off the CPU at 103 MHz and above.

On 12th Gen you could overclock using an external BCLK generator on the motherboard, this is no longer possible.