"The ASCI machines". EPCC. Edinburgh: University of Edinburgh. Archived from the original on July 26, 2003. IBM have installed two SP architecture MPP systems at Lawrence Livermore National Lab -- the Combined Technology Refresh (CTR) system of 1,344 332MHz PowerPC 604e processors and the larger Sustained Stewardship TeraOp machine of 5,856 processors. The CTR system is the machine that appears on the Top 500 list with a peak quoted speed of 0.9 TFLOPS and a sustained Linpack benchmark of 0.46 TFLOPS. In principle, the SST machine has a peak speed of 3.8 TFLOPS, but is as yet unmeasured in benchmark terms.