Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
FSAVE/FRSTOR Instructions
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 FSAVE mem      │ fsave  [bp-94]          │  87 (197-207)+EA
 FSAVEW mem*    │ fsave  cobuffer         │ 287 £
 FSAVED mem*    │                         │ 387 375-376
 FNSAVE mem     │                         │ 486 154,pm=143
 FNSAVEW mem*   │                         │
 FNSAVED mem*   │                         │
────────────────┼─────────────────────────┼─────────────────────────────────
 FRSTOR mem     │ frstor [bp-94]          │  87 (197-207)+EA
 FRSTORW mem*   │                         │ 287 £
 FRSTORD mem*   │                         │ 387 308
                │                         │ 486 131,pm=120
────────────────┴─────────────────────────┴─────────────────────────────────
  * 80387/486 only.
 
  £ Clock counts are not meaningful in determining overall execution
    time of this instruction. Timing is determined by operand
    transfers.
 
  NOTE: The timings reflect the no-wait versions of FSAVE. The wait
        versions may take additional clock cycles.
                                    -♦-