Multi-Card Reader with USB Charging Port

Hi,



I've just built a new system with an RM 650 power supply, and something does not quite work as expected.

I've got a multi-card reader with a USB port solely dedicated to charging (it does not actually work as a proper USB port).



Naively I thought the USB charging port would be active all the time, including when the PC is turned off (it has a dedicated connection to the power supply, with a 4-pin molex). However that is not the case, which reduces the interest of the charging port a lot....



Is this normal ? Is it somehow related to the missing 5V connection in some RM650 ? (which, I understand, should be on all the time, even when the PC is turned off). Or do I need to connect my USB card reader to a specific port of the power supply, which is constantly on ?



Thanks for your help,

David.