As tone says its the same PCB so you have a Blizzard 1240 there, the Oscilator running at 80mhz means your 040 is running at 40mhz which is a very capable card.
They can be upgraded to an 060 but the desoldering work is pretty hard going and you'l need a voltage regulator for 3.5v there is a chap on these boards and over at EAB/Amibay called stachu100 he can do this work and from what I've seen his work is top notch!
My A4000 runs an 040 @ 40mhz and is a very quick machine indeed
Steve.
