Do better ethernet cables matter?

[Anupc (Anup)]

@imprezap2

Screen connected to one side of the cable.

Not discounting what you might have experienced personally, but this is a bad idea because the entire Ethernet cable then behaves as a antenna from induced EMI/RFI;

As discussed extensively in the linked thread;

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.