Do better ethernet cables matter?

[Anupc (Anup)]

I already explained the science behind why extensively. I suggest you go back and re-re-read the thread. Here, let me help;

Ethernet Shielding Options

As Andrew succinctly points out, while [shielded] Ethernet cables grounded at one-end only (like the Melco cable) or completely floating, does work to prevent ground loops, it causes the cable to behave as an Antenna for high frequencies which then couples to the signal carrying twisted pairs (especially with Gigabit Ethernet connections). Achieving the exact opposite results of what people typically use shielded cables for. So, not good.