Flat Ethernet cables have become popular because they can be bent easily and hidden from view, offering a cleaner look for home internet setups. However, before you replace your traditional round cables with the flatter version, it’s worth understanding the trade‑offs that can affect performance.
Both round and flat cables that are rated for the same speed will deliver similar results under ideal conditions. In practice, however, round cables often outperform their flat counterparts because of the way they are constructed. Standard Ethernet cables contain multiple twisted pairs of wires, and the twisting helps keep signals from interfering with each other. Flat cables still use twisted pairs, but they arrange those pairs side by side, which makes them more vulnerable to crosstalk and external interference. Some round cables also include shielding that flat versions typically lack.
Another factor is wire gauge. To keep flat cables thin, manufacturers usually use a smaller‑diameter wire than in round cables. Thinner wires have higher resistance, which can weaken the signal over longer runs. While the specifications of Ethernet allow flat cables to work, the real issue often lies in how they are used. Their flexibility makes them ideal for slipping under doors, around corners, or beneath rugs, but repeated bending or compression can damage the internal wires. The lack of a round shape also means they have less natural cushioning, making the thinner wires more fragile.
Flat Ethernet cables are not without merit. In situations where space is limited—such as running a cable under a narrow doorway in a rental apartment—they may be the only practical option. Hiding a cable under a rug can also keep a workspace looking tidy when a tangle of round cables would be unsightly. For most everyday tasks and short distances, a flat cable can provide a satisfactory connection.
If you need the fastest, most reliable link, especially over longer distances or where high bandwidth is critical, round Ethernet cables remain the preferred choice. For short runs where aesthetics matter more than maximum performance, flat cables can work well as long as you understand their limitations.