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SSE2SSE2 provides double precision and 128-bit integer (int128) SIMD acceleration for Intel's Pentium 4. Single precision operations are handled in the same manner as SSE.SSE2 allows working with 2 64-bit floating point values in parallel to achive 128-bit manipulation. SSE2 follows in capibility of SSE in being able to add 4 32-bit or 8 16-bit values as well. Rival chip-maker AMD added support for SSE2 in their Opteron range of CPUs. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "SSE2".