It's certainly a good initial sign. I'd try a few other benchmarks as well such as Valley, Superposition, Time Spy, Firestrike etc.
I don't recommend Furmark for testing GPU stability. I find it tends to make the card run very hot... but that's about it. I can have a GPU pass in Furmark but not be stable in games.
If it passes other benchmarks then the chances are you will be okay in actual games.