@stepgimb 

When Deco product description says "Gigabit" it means "1 Gbps."

Also, there are multiple X50 models:

X50 - 3× Gigabit Ports

X50 Pro - 2× 2.5 Gbps Ports

X50-PoE - 1× 2.5 Gbps port + 1× Gigabit port

It is easy to distinguish between these models, just looking at pictures on retailer site:

1. Deco X50-PoE has different form factor than the rest of X50s;

2. Deco X50 Pro has just two Ethernet ports, while similarly looking X50 has three.