The SX-7 boasts a peak vector performance of up to 282.5Gflops (floating point operations per second) per node, which is more than three times that of the company's SX-6 supercomputer, which was launched in October 2001.
In its maximum multi-node configuration, the machine has a peak vector performance of 18.1T Flops.
The performance increases seen in the SX-7 are the result of work in several areas, including an increase in the amount of memory that can be shared in each node.
The SX-7 supports up to 256Gbytes of memory per node, up from 64Gbytes in NEC's SX-6 machine, and the maximum data transfer rate has been increased from 256Gbytes per second to 1.13Tbytes per second.
Each SX-7 node supports up to 32 processors, which is four times as many as the SX-6, and each of the NEC-developed custom processors has also been improved. They now run at a clock speed of 8.83Gflops, compared with 8Gflops on the SX-6.
Multi-node configurations of the computer can run from two to 64 nodes meaning support for from 16 to 2,048 processors and up to 16Tbytes of memory.
As a member of the SX series, the machine will run software developed for NEC's Super UX supercomputer operating system.
The machine has a basic monthly rental price of ¥8.2m (£27,500) and NEC hopes to attract orders for around 20 systems during its first year of availability, said Chris Shimizu, a spokesman for NEC.
The SX-7 will go on sale in December.