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(nasm.info)Section B.4.125

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B.4.125. `INVD': Invalidate Internal Caches
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     INVD                          ; 0F 08                [486]

   `INVD' invalidates and empties the processor's internal caches, and
causes the processor to instruct external caches to do the same. It does
not write the contents of the caches back to memory first: any modified
data held in the caches will be lost. To write the data back first, use
`WBINVD' (*Note Section B.4.328::).