Ask ten integrators whether they prefer GigE or USB3 cameras and you will get a genuine argument. Both interfaces carry machine vision's two big industry standards - GigE Vision and USB3 Vision - and both are well supported by every serious camera maker, Hikrobot included. The right answer has nothing to do with brand loyalty and everything to do with four numbers: bandwidth, cable length, camera count, and trigger discipline.
The bandwidth reality, not the brochure
GigE moves 1 gigabit per second, which in practice is about 110-120 MB/s of usable image data. USB3 is nominally 5 Gbps and delivers roughly 350-400 MB/s after protocol overhead. But here is the part spec sheets rarely spell out: most machine vision cameras cannot saturate either link, because the sensor is the bottleneck, not the wire.
Look at the arithmetic across Hikrobot's own GigE lineup and a pattern jumps out. The 5 MP MV-CS050-10GM (Sony IMX264, 2448 x 2048) tops out at 24.2 fps - which is almost exactly 2448 x 2048 x 24.2 frames = 121 MB/s. The 6 MP MV-CU060-10GM runs 19.1 fps of 3072 x 2048 frames: again about 120 MB/s. Even the 20 MP MV-CS200-10GM at 5.9 fps lands on the same ceiling. Every one of these sensors fills the GigE pipe before the sensor itself runs out of speed. A faster interface would not make them faster.
USB3 earns its bandwidth on small, fast sensors: a 1.3 MP global shutter camera that could theoretically run 400 fps will happily blow past what GigE can carry. If your application needs small frames at extreme speeds over a short cable, USB3 is genuinely the better pipe.
Cable runs: where GigE quietly wins
Standard Ethernet cable runs up to 100 meters per segment without repeaters, and ordinary industrial switches extend that indefinitely. USB3 tops out around 3-8 meters per cable in real installations; going longer means active optical cables or repeaters, each one a failure point and each one costing more than the difference in camera price.
This single fact decides most system architectures. A camera on a gantry 40 meters from the controller is a GigE camera, full stop. A camera bolted next to the PC on an inspection bench can be either.
One camera or many?
GigE is a network protocol, so a switch turns one NIC into a multi-camera backbone - four, eight, sixteen cameras sharing segmented bandwidth, each individually addressable, with PoE variants carrying power over the same cable. Multi-camera stations (think four-sided box inspection) are native GigE territory.
USB3 is a point-to-point bus: one camera, one host controller. Multi-camera USB3 systems need one controller per camera or PCIe expansion cards, which works fine for two or three cameras and gets architecturally ugly beyond that.
Trigger and sync discipline
Both standards support hardware line triggers with sub-microsecond latency, so precision triggering is not a differentiator. What GigE adds is Action Commands: a broadcast that fires multiple cameras on the same network at the same instant, which matters for multi-camera stations where frames must line up. USB3 handles per-camera triggering perfectly well; synchronized multi-camera strobing is simply more elegant over a network.
The decision, compressed
| Your situation | Better fit |
|---|---|
| Cable over 5 m, or camera far from controller | GigE |
| 4+ cameras in one station | GigE |
| Single camera on a bench, small sensor at high fps | USB3 |
| Existing plant Ethernet infrastructure | GigE |
| Budget single-camera cell, short run | Either - pick by sensor, then interface |
One last practical note: high-resolution sensors above roughly 12 MP end up GigE-bound anyway, since the sensor cannot outrun even the GigE link - the 12 MP MV-CU120-10GM and 20 MP MV-CS200-10GM are both perfectly happy on the network. Choosing between interfaces matters most in the 0.4 to 6 MP range, where sensors like the IMX264 in the MV-CS050-10GM or the IMX178 in the MV-CU060-10GM are fast enough to make the pipe the limit.
We stock both interface families new and refurbished, and every product page lists the exact interface, frame rate, and sensor so you can do this math on your own numbers before you buy.