mysterious object included with case

[ohyeahar]

i just purchased a the Cooler Master Centurion 5 case. among the screws, mobo mounts, and a (very cool) case badge, there's this round grey object that i've never seen before. does anyone know what this is suppose to be for? it looks like it's made of metal but it's very light and it doesn't make a "metal" sound when struck with something. the hole is about the size of someone's pinky.
the only logical use i can think of is for wire routing...

[wrathchild_67]

You're supposed to run the reset, power on, speaker, power led, hdd led wires through it.

[ohyeahar]

hmm...that's what i figured...thx

[Todd a]

Then why did you ask? Are you testing us?

[ohyeahar]

haha...well...i honestly didn't know what it was... other than for putting wires through it, i didn't know what else it could be used for... i just needed to confirm my suspicions...

[DanceMan]

The wires are not merely passed through this loop, they go through, around and through again. It's a strain relief.

[The*Q*]

It is an RF choke to filter out RMI and noise. It's made of ferrite and chokes out the spurious emissions floating arouns in the case.

[ohyeahar]

very cute

[DanceMan]

Thanks, Q. I have one or tow builds that I neglected to reinstall the choke after working on the bezel for cooling.

[The*Q*]

Originally posted by ohyeahar
very cute

I'm not kidding. That is, in fact, a ferrite choke and you loop the wire through it two or three times and it filters unwanted emissions. You can also buy them as snap beads that clamp over the wires and snap together. We use them by the ton for filtering HAM and CB radio signals from TV and phone lines.

[F_A_L_C_O_N]

If you have better graphic card that needs power cord, getting another ferrite to run power cord through it, is probably a good idea, especially in smaller cases

[ohyeahar]

haha...i totally thoght you were joking about that ferrite bit. boy i feel stupid...

[The*Q*]

Torroid cores and ferrite donuts are a very good way to kep clean power to your system. I even use very large ones to run my ATX power cables through when I have the room and long enough leads. Not very often but sometimes I can. I ALWAYS run my speaker, reset, power, and LED leads through them. I wrap them twice through. If you cant use them on your power source you can use large snap beads from "All Electronics" and snap them right over the power cables.