The speed of data transfer is limited by the connection type, cabling, and maximum speeds that your server and link partner support.
These speeds can be 10, 100, 1000 Mbps (1 Gbps), or 10 000
Mbps (10 Gbps). 
The cable type you use will directly limit what speed you can transmit and receive data. For more information about cabling types and their capabilities, see the Establish a physical connection to your network topic.
The maximum line speed of your server is also affected by the type of input/output adapter (IOA) that you are using. For more specific information about each supported IOA, see the Hardware requirements for Ethernet topic.