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non-SSE2


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Nope.  Virtually all computers sold after about 2004 have chips that use SSE2, and a vanishingly small fraction of SL's resident community have computers that old.  When LL made SSE2 compatability a requirement a couple of months ago, it hardly created a ripple of complaint, so I think they are pretty confident that they made the right move.

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maybe not a V2 version, but possibly a V1 version with V2 features... Phoenix is still viable in the short term (default version is non-SSE2), and I believe neither Cool, nor Singularity require it, but both are actively developed still and have most if not all current V2 features, and are both working on mesh support.

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"Virtually" as in "a large majority". 

Borrowing here from Wikipedia: "SSE2, Streaming SIMD Extensions 2, is one of the Intel SIMD (Single Instruction, Multiple Data) processor supplementary instruction sets first introduced by Intel with the initial version of the Pentium 4 in 2001. It extends the earlier SSE instruction set, and is intended to fully supplant MMX. [...... ]Rival chip-maker AMD added support for SSE2 with the introduction of their Opteron and Athlon 64 ranges of AMD6464-bit CPUs in 2003. [.......]  SSE2 and the other SIMD instruction sets were intended primarily to improve CPU support for realtime graphics, notably gaming. A CPU that is not marketed for this purpose or that has an alternative SIMD instruction set has no need for SSE2. The following CPUs implemented IA-32 after SSE2 was developed, but did not implement SSE2:

In other words, there aren't a lot of non-SSE2 computers out there that have been built since about 2003.

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