The easiest way to discover is download nice hash miner or cryptonote miner and you will discover yourself.
I don't wanna disappoint you, but the reason no-one answered is that this GPU is pretty old and even a few years ago wasn't good for mining
So i think that you will waste your time in discovering the hashrate, it will be damn low.
I agree, for mining you could get a cheap Tahiti.
Yeah, this is a good advice.
If you wanna try mining with your current equipment you could buy a Thaiti if your PSU is strong enough and if your electricity is cheap.
Otherwise a modern GPU like a 470 (even the 4gb version) will do a better job