The fact that B660 motherboards might not support Gen5 is actually a bit surprising considering that Gen5 lanes are attached to the CPU, not the chipset. However, the B660 chipset is aiming at the mid-range segment and 12th Gen Core non-K series. People who might want to upgrade to the LGA1700 platform with the minimum investment are not likely to jump on the Gen5 GPUs and SSDs right away (such devices are expected to launch in the first half of 2022). So needless to say Gen5 is not exactly a feature they might miss.
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