Cray SV1 is a vector supercomputer of Silicon Graphics 's Cray Research division, introduced on the market in 1998. Like its predecessor, the Cray J90 , the Cray SV1 had CMOS processors, which reduced the cost of the system and used air cooling instead of water cooling. SV1 was software backward compatible with J90 and Y-MP , and was running the same UNIX-like UNICOS operating system. SV1 used the representation of real numbers according to Cray's own standard instead of the common IEEE 754 standard used on the Cray T3E and Cray T90 models .
Unlike other models, SV1 was equipped with a vector cache. It also had a multi-streaming function, when one processor from each of the four processor boards could work together, forming a virtual processor with four times the performance . The processor in SV1 was clocked at 300 MHz. Later versions of SV1 - SV1e and SV1ex - had processors with a clock frequency of 500 MHz. These options also had faster memory and support for solid state drives. The system could install up to 30 processors.
Several SV1 racks could be clustered by connecting them with a GigaRing channel, which also had support for HIPPI , FDDI , ATM , Ethernet , and the ability to connect SCSI devices. In theory, it was possible to create a cluster of 32 nodes and achieve peak performance at 1 Teraflops .
The successor to SV1 in 2003 was the Cray X1 vector supercomputer, and in 2005, its more advanced Cray X1E model.