Is this add-in card compatible with older network systems?

Yes, the familiar RJ45 connector is backwards compatible with legacy networks, allowing for incremental expansion.

What is the maximum throughput this add-in card can achieve?

This add-in card can achieve a maximum throughput of up to 20 Gb/s when the dual 10GbE ports are combined into a Link Aggregation Group.

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Synology E10G30-T2 Dual-port 10GbE 10GBASE-T Add-In Card for Synology Systems

Familiar RJ45 connector is backwards compatible with legacy networks and allows for incremental expansion.
Dual 10GbE ports can be combined into a Link Aggregation Group to boost throughput up to 20 Gb/s, while also providing port failover and load balancing functionality.
Support for CPU offloading and load balancing technologies enables optimal system performance.