Is it worth it to mine Dash/LTC with my gtx 950?
Not only no but HELL no.
LTC (Scrypt) was taken over by ASIC a few years ago.
DASH (X11) was taken over by ASIC last year.
IMO for a 950 just put Nicehash on the machine and let it pick - the coins a 950 can mine now tend to bounce around fairly often on profitability, too big a PITA to track them IMO.
And yes, it turned out my 950 cards were 2GB - just for some reason they were able to mine ETH for about a month longer than my 2GB AMD-based cards.