You don't need any calculators to figure out that this GPU is useless at mining. I remember when it came out and it was about a decade ago, somewhere in the year 2010. Its successor was the Radeon 79xx series. So basically the HD7950,7970, and R9 280X. And these days you can't even find anything decent to mine on those GPUs which are a huge step above in performance and have more memory.
I actually had the HD6990 which was the dual GPU version of the 6970. It was a pretty powerful card. It could mine BTC, LTC, X11, ETH and ZEC. Basically it was a huge power hog however it was like 40nm technology instead of the 14nm in the newer GPUs. Hence not ideal for mining at all.
ah.. the good ol' days. I had 2x HD5970(also dual GPU) both supplied with arctic coolers as my first mining/gaming cards
I remember they could withstand worse mining environments unlike the later cards probably because of the larger fab process - 28nm,
vrm @105-110c was totally fine for them.
One of them is still in working condition.
Cheers!