Yes, usb power may be supplied via +5VSB (5V Standby power), even when the PC is powered down. This is in order to support "Power On By Keyboard" (when one is using a USB keyboard). All Mobos i came across that support that feature had some jumper(s) to select wether power is supplied by +5VSB or by the normal +5V rail. if that power is a concrn to you, RTFM to find this jumper. -- "Feel free" - 10 GB Mailbox, 100 FreeSMS/Monat ... Jetzt GMX TopMail testen: http://www.gmx.net/de/go/topmail