This smaller design, the Cell Broadband Engine or Cell/BE was fabricated using a 90 nm SOI process. In March 2007, IBM announced that the 65 nm version of Cell/BE is in production at its plant (at the time, now GlobalFoundries') in East Fishkill, New York, with Bandai Namco Entertainment using the Cell/BE processor for their 357 arcade board as well as the subsequent 369. In February 2008, IBM announced that it would begin to fabricate Cell processors with the 45 nm process. In May 2008, IBM introduced the high-performance double-precision floating-point version of the Cell processor, the PowerXCell 8i, at the 65 nm feature size. In May 2008, an Opteron- and PowerXCell 8i-based supercomputer, the IBM Roadrunner system, became the world's first system to achieve one petaFLOPS, and was the fastest computer in the world until third quarter 2009. The world's three most energy-efficient supercomputers, as represented by the Green500 list, are similarly based on the PowerXCell 8i. In August 2009 the 45 nm Cell processor was introduced in concert with Sony's PlayStation 3 Slim. By November 2009, IBM had discontinued the development of a Cell processor with 32 APUs but was still developing other Cell products. Commercialization On May 17, 2005, Sony Computer Entertainment confirmed some specifications of the Cell processor that would be shipping in the then-forthcoming PlayStation 3 console. This Cell configuration has one PPE on the core, with eight physical SPEs in silicon. In the PlayStation 3, one SPE is locked-out during the test process, a practice which helps to improve manufacturing yields, and another one is reserved for the OS, leaving 6 free SPEs to be used by games' code. The target clock-frequency at introduction is 3.2 GHz. The introductory design is fabricated using a 90 nm SOI process, with initial volume production slated for IBM's facility in East Fishkill, New York. The relationship between cores and threads is a common source of confusion. The PPE core is dual threaded and manifests in software as two independent threads of execution while each active SPE manifests as a single thread. In the PlayStation 3 configuration as described by Sony, the Cell processor provides nine independent threads of execution. On June 28, 2005, IBM and Mercury Computer Systems announced a partnership agreement to build Cell-based computer systems for embedded applications such as medical imaging, industrial inspection, aerospace and defense, seismic processing, and telecommunications. Mercury has since then