As far as I know, it's only Dell that does this. It is criminal in its spiteful stupidity and folly. To use the same connectors as ordinary hardware, but using different wiring, just to lock buyers in, and punish anyone who dares to use other equipment, without any warning whatsoever.
Shortsighted as well. I mean if i had cooked a Dell mobo by powering it up with a normal PSU, or the other way around, do you think I would go back to Dell ever again?