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How to connect cables?

C

Cybore

Weaksauce
Joined
Mar 11, 2005
Messages
90
sorry about the terminology, couldn't find the right words. What I am trying to ask, is if it makes a big difference if you only use one or two cables from the power supply to attach to your fans, hd, video card, etc. I have understood that the videocard must be isolated preferably, but I have not undertood clearly if I should use all the molex provided. A lot of mess due to wiring can be removed. If my 120mm fan does not power up when attached to motherboard does that mean is defective? because I have two and they only work when powered by molex.

hopefully someone understood what im talking about.
 
If plugging the fans into drive Molexes, try to keep them altogether on the same connector (or two, depending on what's available.)

If your fans work on a Molex but not on a header, then the problem isn't the fan. The fan's going to try to get 12V one way or the other. ;) It could be a dead fan header on the board (not uncommon,) but make sure the motherboard doesn't have any kind of "smart-fan" function that prevents case fans from spinning up unless the temps are above a certain number.
 
generally its just the wiring harness lead that attaches to the videocard that youd want "dedicated" without additional devices on it, other devices because they lack sheilding to one degree or another can add electromagnetic interference (EMI) to the power
generally not that big a deal but supplying the videocard with the cleanest power possible is a good idea
in addition other devices can intermittently require more or less power, thus on that lead more fluctuation of the current can occur

its best to not overload any one lead,
I try to keep it to say 3 HDDs especially if they are acting on concert (like in a RAID array where they all move the armeture at the same time for a seek)
devices that would draw power at different times like a HDD and an optical present less of an issue,
the HDD would typically already be spun up when the optical tapped the line for power to spinup,
but say you placed 5 HDDs on the same lead, at boot they would all be competing for the amps that could be stuffed through that size of wire
(bigger the wire diameter more amps and less resistance)
unless the controller staggered their spinup which is common on SCSI RAID

fans dont draw nearly as much as a HDD spinning up (which are typically 1.9 > 2.3A) the worse fan I have (a volcano) does all of 0.7 and a typical 80mm only 0.37 so incrementally more fans can be attached to a lead
consider the boot power needs and the typical use power needs and then mix and match devices
this is being overly cautious for the most part but it doesnt hurt :p
 
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