using 5V SB for my project

First Thank you for all your helpfull answers. So i know from tests that the 5v sb is always on but you are right probably it isn't meant to pull current from this part of the board. So did i understand this right you would recommend me using the usbpwr pin from a usb2.0 port?(usb3.0 is in use)Doesn't usb power need a verification so it delivers more than 500mA?

An alternative to the IR header might be a USB port. The USB ports have been powered up after the PC is shutdown on ASRock boards for a while now. Your board has the XFast Charger port on the IO panel, and in one of the USB 2.0 headers on the board, which could be adapted for your purpose.

See page 33 of the User Manual, which you must download from your board's information page:

http://www.asrock.com/mb/Intel/X79%20Extreme3/?cat=Manual

Your board also has a USB 3.0 header on the board. USB 3.0 provides more current that USB 2.0 does.

I am skeptical that the +5VSB pin on the IR header can supply up to 1 Amp of current, and as said above, you would need to be in Sleep or Hibernate mode for the +5VSB supply in your PSU to be active. Of course even when shutdown, a board still receives power from the PSU.

But consider this: If the PC can be turned on and off from the IR remote control, is it just in Sleep, or really shutdown?

kappi1997 wrote: the thing is i don't want to modify my psu cause it would waste my warranty.

I don't think you'd need to open it. +5v is +5v

If you "expect' the +5vSB to be hot, the computer must be in a Sleep State anyway.

It would seem to me seeings the PSU is supplying +5v to the SB "rail' you could simply grab a +5v you need from the red wire off a 4-pin molex from the PSU.

Meh, that might not workout above to grab a +5v supply ............. sec



Tada. Use a DVM to verify but use the purple wire in position 9 of the main 24-pin motherboard power. That's the +5vSB wire coming directly from the PSU.

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24



That work? Or didn't you plan on having to have the computer in a sleep state?

Why there? Just take it from the PSU and not worry of draw.