The company claims half-round-trip latency of 780ns, with sub-microsecond latency for TCP and UDP.
Linux software provided with the card allows sockets applications to benefit from the X10's low latency without recompilation.
Support for Windows is promised.
Other features include optional forwarding between the two ports with sub-110ns latency, and nanosecond-accurate packet timestamping with provision for a single timebase across multiple cards.
"The ExaNIC X10 is a generation ahead of existing network cards and offers an unprecedented level of flexibility," said Exablaze chairman Greg Robinson.
"Customers get the benefit of the industry's lowest latency NIC, whilst deploying hardware that incorporates the latest generation Xilinx UltraScale FPGA technology at a network card price point."