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Possible Load on a molex cable

post #1 of 4
Thread Starter 
Hi I was hoping to add quite a few things to a single Molex cable to keep things neat just wondering if it's safe or whether it will trip the psu.... This is what I'm planning... smile.gif


4 hdd (2x 1tb 7200rpm + Green 2bt 5400rpm + ssd 240g)
=10 x 4 = 40w (just using max starting amps for 1tb 7200rpm know the rest are lower)

3 x Phobya flexylighting attached to Molex on a On/Off switch
(I'm told 12w each seems a bit much)
=12w x 3 36W

2x Aquacomputer AQ5 w/ (altogether)
21 x fans 1400rpm
2 x ddc-1 12W
= 60w+60w = 120w (nowhere near this but I'll just use the theoretical max anyway)
so all up a very generous = 196 W

The PSU I'm using is the Platimax 1200



Just for easy spec read out (btw Molex cables are 16awg if that means anything and the load will be on only 3 of the 4 Molex connector heads)

1) I figure 30A x 12 = 360W which should be plenty but will that trip the PSU running it all of one channel! (offcourse I'm assuming hear that you can get the full 30amp just out of the 12v)

2 ) Also will turning on and of the lighting Molex w/ the on/off switch trip it!

3 ) On an unrelated side note just so I don't start another thread.. Are you meant to remove your MB battery when running a leek test! smile.gif
    
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post #2 of 4
On a leak test the motherboard shouldn't even be powered on. Just short the PSU with a paperclip (there are guides for this online already), and nothing else needs to be powered but the water cooling system.

I doubt you could do all of that through one molex line, but it's written on the sticker on the side of your PSU. It'll tell you the max amp rating of each rail in the PSU.
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post #3 of 4
For shorting the power supply, short any Ground(Black Wire) pin and Pin14(Green Wire), and apparently powering it on without any load may damage it, so don't do that.

A typical HDD draws about 3A at startup - during max power consumption. I looked up your PSU, it has 6 +12V rails, rated 30A each. From what I saw in the link below (last diagram on the page), the 4th and 6th 12V rail power the Molex/SATA connectors. And the 4th rail is also shared with another connector. So in theory, if you use the Molex that's on the 6th 12V rail, i.e independent, that should be enough to power all your stuff. 4 HDD's would use no more than 12A, leaving more than enough room for the fans.

I am no guru at this, so you might want to get this confirmed with a PSU buff. I know we have one around here, sorry I don't recall his OCN nick. But I'm pretty sure what I said is accurate.


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post #4 of 4
#16 gauge wire has a max current according to most Electrical Codes of only 10 - 15 A, which at 12 V is 120 - 180 W so I would definitely run some stuff off a separate molex line from the PSU. Having everything come off one rail isn't the best either. You probably won't trip the PSU, but that much current running through the wires could eventually damage the wires and connectors.

As for the motherboard battery, you don't need to remove it, the motherboard won;t be getting powered on anyway.
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