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 together. You might even remember plugging it that way when you first assembled your PC. Almost nobody needs that split anymore, but power supplies still ship with this 4+4 split, and the reason has a lot to do with the CPU industry of the early 2000s.
We haven't written up this one. XDA Developers has the full story — the link below goes straight to it.
