They may/maynot be needed. They are there to reduce signal noise (whine) from your PSU when plugged into your video card.
Some of my current systems have this whine--my guess is that most people do not notice it over their fans, but in my media center PC with a Corsair 620HX and a low profile 9800GT it is bad. I used to think it was the BDROM but after unplugging it I realized what it was.
After listening for it in my other PCs I noticed quite a few have it--but the sound of hard drives, fans (even low RPM ones) combined with the use of headphones covers it up.
Either way, they are not critical to your operation--only if you are a silent junky like myself. =)
I want to experiment by moving them closer to the PSU to make them work, or figure out a nice way of including them in the sleeve.




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