Ehider,
The difficult part of defining "better" PC performance is knowing what is causing the change in sonics from cord to cord. You can't say with certainty that a cable sounds better because it offers 'filtering' of some sort, unless you've compared the exact same cable with and without filtering. Several power cable companies claim that certain of their cords sound better because of a degree of RFI filtering, and yet they also employ other changes on these cords, such as different geometry, different gauge, or even different connectors. When measured, many of these 'filtering' cables have significantly different inductance and capacitance values compared to a basic "diy" cable, which makes it hard to know if you're hearing the filtering, or the increased inductance.
If that seems to leave the issue 'up in the air', I think that's exactly what some of the cable marketing out there seeks to achieve.