The Zorro 3 is not as fast as a Zorro 3 of an A4000. If you use an Amiga 4000 CPU card. But it is always faster then Zorro2 with an A1200 accelerator card.
Do not use a X-surf, because it is not compatible with this board.
The 3640/25 does not have memory banks, so your speed of your Amiga will not increase very much. You be better off to use a Cyberstorm Card or other like GVP and Apollo.
