OM3 and OM4 are both types of multi-mode fiber optic cables, but they have some differences in terms of their performance and capabilities.

The primary difference between OM3 and OM4 is their maximum data transmission speeds and the maximum distance they can support. OM3 fiber optic cables have a maximum data transmission speed of 10 Gbps and can support distances up to 300 meters. On the other hand, OM4 fiber optic cables have a maximum data transmission speed of 10 Gbps or 40 Gbps and can support distances up to 550 meters at 10 Gbps and 150 meters at 40 Gbps.

Additionally, OM4 fiber optic cables are designed to have lower attenuation and higher bandwidth compared to OM3 cables, making them suitable for high-speed, long-distance data transmission in applications such as data centers, enterprise networks, and high-performance computing environments.

In summary, OM4 fiber optic cables offer higher performance and longer transmission distances compared to OM3 cables, making them a preferred choice for high-speed, long-distance data transmission applications.