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What is this on my PCIE cable?? - Page 3

post #21 of 22
Ferrite beads are used to prevent EMI/RFI from the cable they're on, not prevent the cable they're on from other's EMI/RFI.
   
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post #22 of 22
A ferrite core is an inductor that is used as a low frequency filter typically used to remove mains frequencies noise (50-60Hz) that can get coupled in by stray capacitance, EMI radiation etc. this is why you tend to see them on mains connected equipment.

Inductors are used to block noise below a certain frequency as it resists change in current and capacitors can be used to block noise above a certain frequency. Together they form the building blocks of many band pass filters.... If I remember my university electronics correctly!

Switch mode power supplies (I.e all PC power supplies) produce a voltage by rapidly switching their output on and off and can generate a lot of EMI noise which will radiate via any unshielded cable.

Anyway, I'd leave them on, the manufacturer of the psu clearly thought they needed them!
 
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