KMBox Net vs MAKCU vs Ferrum

All three sit between your mouse and the game PC. Your movements pass through; when the second PC has a correction to make, it sends it to the box and the box adds it to the same USB stream. The game PC sees one ordinary mouse and nothing else.

So the question is never "which one aims better". The aim is computed on the second PC and is identical in all three cases. The question is how the box receives it.

• KMBox Net takes its orders over the network, as UDP packets to an address and a port. The second PC needs no cable to it at all - only a network path.
• MAKCU and Ferrum take theirs over a serial link: a second USB cable from the box to the second PC, seen there as a COM port.

That single difference decides the cabling, the failure modes and, usually, the choice.

Take the KMBox Net when the two machines are not next to each other, when you want the second PC to be a laptop you move around, or when you are short of USB ports. Its failure modes are network ones: an address that changed, client isolation on the access point, a VPN swallowing UDP.

Take a MAKCU or a Ferrum when both machines sit on the same desk. A cable has nothing to configure: no address, no port, no UUID. Its failure modes are driver ones: a missing USB serial driver, a port already held by another program, the wrong baud rate.

If you have none of them yet and the machines are side by side, serial is the shorter path. If your second PC moves, the Net box stops being a cable problem.

The products ask for the same thing either way: Settings > Device, then the device type.

• Serial (MAKCU, Ferrum, KMBox B): a port, which Auto finds on its own, and a baud rate - 4000000, or 115200 for a box that only speaks that.
• KMBox Net: an IP (192.168.2.188 by default), a port (8965) and the eight-character UUID shown on the box screen.

Auto-connect makes either of them come back by itself at the next launch, so this is a one-time setup.

On a local network a UDP packet and a 4 Mbaud serial write are both far below the time it takes the game to draw the next frame, so neither is a bottleneck for aim. A 115200 link is the one case where the wire is slow enough to notice, which is why it is a fallback rather than a default.

What does change the feel is not the box: it is the smoothing and the FOV you set in the aim settings.