Your old gpu has a dms59 port, this is 2 outputs on 1 port. Dl dvi is 1 output on 1 port. Other than a splitter you will not get 2 independent monitors on a single normal port. Don't confuse splitters that can just duplicate monitors vs splitters that can make them independent.
Thanks, that what I needed, it's a same I can't get my PC Dual Screen, thanks again.