I had to put the most powerful thing I could find into a Dell today that had no PCI-E 6-pin power available.
I found a FirePro V4900 lying around (it's a 6670 with a FirePro badge on the front) but realised that just two years ago this was state-of-the-art at the 75W power envelope, right up until the 7750 managed to squeeze GCN under 75W.
If you look how much the graphics market has stagnated of late, it's absolutely staggering how much performance the <75W category has gained. From 6670 to 7750 and now the 750Ti, performance has practically quadrupled.
Imagine where we'd be now if the performance at the high-end had also quadrupled in just two years.
This is my signature. There are many like it, but this one is mine. However, my signature is neither my best friend, nor is it my life. I also have no desire to master it and my worth is not signature-dependent.