vSx

VSX is an acronym that can denote several different things depending on context. In computing, it most notably refers to the Vector-Scalar eXtension (VSX) of the IBM POWER architecture. VSX extends the processor’s capability with vector operations alongside scalar instructions, enabling higher performance in scientific computing, media processing, and other data-intensive tasks. It provides 128-bit vector registers and related instructions, and is designed to integrate with existing POWER instruction sets and compilers. VSX has been used by IBM POWER processors since around the POWER6/POWER7 era and remains a feature in newer generations, often coupled with software that can leverage SIMD.

In consumer electronics, VSX has been used as a model prefix by Sony for some of its home theater receivers and other audio/video components. Models with VSX branding are marketed for features such as high-fidelity audio, surround processing, and digital input support. The use of the VSX label in product names is separate from IBM’s VSX technology and reflects branding choices by the manufacturer.

Because VSX is an acronym with multiple meanings, the intended reference is usually clarified by context, industry, or accompanying specifications. Outside of IBM and Sony, other companies or standards may employ VSX as an abbreviation for different concepts, so when encountering the term it is best to consult source material to determine the exact meaning.