SIMD -- Single Instruction Multiple Data -- can have logically distributed or shared memory
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Examples are CM-1,2 from Thinking Machines
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and AMT DAP and Maspar which are currently focussed entirely on accelerating parts of database indexing
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This architecture is of decreasing interest as has reduced functionality without significant cost advantage compared to MIMD machines
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Cost of synchronization in MIMD machines is not high!
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Main interest of SIMD is flexible bit arithmetic as processors "small" but as transistor densities get higher this also becomes less interesting as full function 64 bit CPU's only use a small fraction of silicon of modern computer
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