Why do some AMD CPUs still use pins?

CPU chip designs change all the time, but the connectors they use to plug into a motherboard rarely do. Except with AMD's ...
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Your CPU power cable is still split into 4+4 pins due to a Pentium 4-era leftover

If you look at the 8-pin cable running to the top-left corner of your motherboard, it's most likely two 4-pin cables joined ...