In EB 1 the unit limit would've been 500, but towards the end there was some sense of a plan to leave slots for an EB 2. In EB 2 the unit limit is 500. There are about 460 entries in the EB 1 EDU.
In both cases the limit arises from the constraints placed on the EDU (500 entries), and not DMB (250 and unknown number of entries respectively).
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