253 nailed it, you happened to buy a card that is very popular for mining. It's easy to overclock a 7950 and the compute performance is good for the power draw.
Newer video cards are better for gaming but ATI recent offerings have high power consumption to performance ratios and Nvidia has limited compute performance on their cards so as not to compete with their Titan.
[Quote=TH] AMD's architecture is proficient with the scrypt algorithm, which is memory bandwidth-intensive. And so miners are loading up on the cards able to give them the highest hash rates per watt. Unfortunately, AMD says there is nothing it can do to control the elevated prices on its cards; vendors are the ones jacking up the prices.[/quote]
Darren Waller '15: Breaking barriers, building a future