Der8auer has just confirmed that it is possible to overclock Intel Alder Lake non-K CPUs on B660 motherboards. Roman has proved that BCLK OC functionality is not limited to Z690 motherboards. He bought two ASUS ROG STRIX B660 motherboards to verify if this characteristic works on the Intel 600 series or not. The overclocker verified that ASUS ROG STRIX B660-I and ROG STRIX B660-F are compatible with BCLK overclocking.
ASUS ROG Maximus Z690 series is more expensive than these motherboards. Roman elaborates that this characteristic is only functional on B660 motherboards with DDR5 memory. He has no experience with any DDR4 motherboard on which it is functional.
However, the bus speed overclocking process is quite different on the B660 series and Z690. The BCLK OC option is absent in the Tweaker’s Paradise in ASUS’s recently issued BIOS, and the motherboards do not support XMP profiles. The Youtuber has beautifully explained the method step by step, on how to get higher clocks.
der8auer has noted one important thing in the last step. ASUS BIOS will confirm the enabling of BCLK overclocking resulting in an extension of the first boot time to approximately one minute. If it takes more time than this, there is a possibility that something might have gone wrong. 5GHz i5-12400 more or less reaches Ryzen 7 5800X Cinebench R20 Multi-Core performance, even though it has fewer (6C vs 8C).
According to der8auer, the CPU has a similar performance to the Z690 BCLK OC test i.e a peak temperature of up to 93°C and a power of 117W. These results are only based on the Cinebench R20 test, a bit different results can be observed during gaming (~70W).