 It was generally rated at 20 MFLOPS peak for double precision (64-bit), and 40 MFLOPS peak for single precision (32-bit), about one fifth the normal speed of the Cray-1.They also invested heavily in advanced automatic vectorizing compilers in order to gain performance when existing programs were ported to their systems.The machines ran a BSD version of Unix known initially as Convex Unix then later as ConvexOS due to trademark and licensing issues.