- Edited
That's exactly what I wanted to say. the amount of 7970s you can buy for the price of those Pi's is like 7 lol and 2 would outperform the pis if they scaled perfectly while consuming the same amount of power.-DNA- wroteit may sound good but the Pis are no where near the processing power needed for mining, and those hundreds of Pis would cost a fortune and they don't even have the power of a single 7970 not to mention that their Gpu's dont work with opencl in the first place. :p
EDIT: sorry, calculation mistake. I was discussing Radeon 7970 DP performance vs. expected Rpi SP performance. Radeon 7970's SP performance is 4 times DP performance. That makes half a 7970 as powerful as 100RPis, if each GPU has around 24GFLOPs single precision. At 1/4th the power consumption too.