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The table below gives details of transfer rates for expanded memory implemented in a number of ways using the same 20 MHz 386DX system. The external hardware expanded memory was a medium quality ISA board-in practice you could do better by paying more. Notice that it isn’t the absolute figures that matter but the relative difference.

Comparision of expanded memory transfer rates:

                                                                                                Transfer rate (KByte/s)

External Hardware EMS ISA                                                 328

Internal Hardware EMS                                                         1372

EMM386                                                                                 1267

386MAX                                                                                 1323

QEMM                                                                                    1450