There is only one way to know for sure if it works: try it.
In some machines it works, in others it's unstable, or worse: doesn't work at all.
DMAC 4 is very hard to find, and therefore very, very expensive. For that money you could better get a Cyberstorm MK2 for instance, which also gives you the option of an additional 128MB RAM. (yes, I've seen DMAC's in the same pricerange!)
