When I'm launching ethminer it return the following lines
and exit after
m 01:48:55 main Speed 0,00 Mh/s gpu0 0,00 [A0] Time: 00:00
Has my GPU enough memory?
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For mining Ethereum it is necessary to build a so called DAG. This post explains it.
Ethereum has AFAIK the highest demand to resources to mine amongst all currencies.
According to this reddit post mining with your card might not work due to insufficient memory. Seems like you ran into that problem.