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The case I want to use does not have an option to connect the power or HDD activity LED. Therefore I would like to use some 3V LEDs I already own.

However, since they are only for 3V, I would like to know which voltage does the power on/status and the HDD activity LED connector deliver and if I can use them.

The motherboard in question is a Gigabyte GA-Z68XP-UD3-iSSD, but the manual does not provide any information about this topic.

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Do you have a multimeter? Plug it in and see what the DC voltage is directly. They can be had pretty cheaply. It'll help to have a normal load on the circuit; plug a standard case LED into there at the same time and put the multimeter in parallel. –  Chris Smith Aug 17 '11 at 17:31
    
@Chris Smith: No, I'm sorry I have no multimeter - yet. But I buy one with the next PC ;) –  TeX HeX Aug 17 '11 at 17:33
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up vote 1 down vote accepted

The only thing I could find that mentioned a voltage was here and it specified 3.3V

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Thanks. A friend of mine just sent me this link and they say it would be 6V? tomshardware.co.uk/forum/105629-12-power-voltage –  TeX HeX Aug 17 '11 at 17:19
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This one says 3.3V overclock.net/computer-peripherals/… I guess the worst that will happen is your LED will go pop it won't kill the PC –  Col Aug 17 '11 at 17:21
    
Poor mens test then? If it smells = Does not work. JK, I will test it. Thanks for the fast answer! –  TeX HeX Aug 17 '11 at 17:31
    
Good luck with it. –  Col Aug 17 '11 at 17:46
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