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(nasm.info)Section B.4.248

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B.4.248. `PREFETCH': Prefetch Data Into Caches
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     PREFETCH mem8                 ; 0F 0D /0             [PENT,3DNOW]
     PREFETCHW mem8                ; 0F 0D /1             [PENT,3DNOW]

   `PREFETCH' and `PREFETCHW' fetch the line of data from memory that
contains the specified byte. `PREFETCHW' performs differently on the
Athlon to earlier processors.

   For more details, see the 3DNow! Technology Manual.