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I thought they got rid of the need for master/slave thing with the X1950?
The x1950's/x1900's could also do software crossfire with 2x normal cards (no master was required), it was added into the drivers ages ago even though there were master cards for those series of cards, i think ATi added it into the drivers because everyone was complaining about not being able to find the masters, they were thin on the ground.
EDIT: Was the Catalyst 6.11's where they did away with the masters..
Taken from the release notes :-
This release of Catalyst® introduces software CrossFire™ support for any combination of Radeon® X1900 and X1950 installed in a system running either the Windows XP or Windows XP Professional x64 Edition operating system.