The cluster linked 16 of the company's Primergy dual-processor servers - a total of 32 processors - using Infiniband, a relatively new interconnection system aimed at making cluster building easier.
The cluster was controlled by SCore, a software application developed as part of the Japanese government's Real World Computing Project (RWCP), and was running pre-release versions of Intel's Infiniband system. Together these components produced a maximum data transfer rate of 2.5Gbps.
The system will get its public debut later this week at a high-performance computing seminar in Japan.
Earlier this year NEC announced the opening of an engineering centre for Linux-based PC cluster systems in Tokyo. The centre uses NEC Linux servers and SCore to control the cluster, but the interconnection between the machines uses Ethernet or Myrinet, which have slower maximum data transfer rates.