An interface board capable to connect the PCI bus to two serial links at 1 Gbit/s each is presented. That PCI-HSLink board has been developed at CERN as a component of a testbed for the distribution and analysis of high energy data from new colliders. By using those boards and appropriate cross-link switches in our cluster of 16 Pentium Pro dual nodes (RTNN), a high performance, low cost full parallel machine is achieved.