You can't mine SHA-256 coins with GPUs
Wrong.
Care to elaborate? This isn't 2011 or 2012 anymore. You can't even mine with those USB blue or red furies or even Antminer U1's anymore due to difficulty and network hashrate.
You can mine with GPUs, you can mine with blue and red furies and you can mine with Antminer U1s, they won't be profitable but you can certainly mine with them
I've been bouncing around mining various alt SHA-256 coins with my antminers, if one of those hit even a fraction as good as BTC did, I'll be very happy. For me it's more fun and interesting then a money making operation, and truthfully I'd suggest anyone interested in cryptocurrency to give them a try just to get an understanding, they are easy to use and cost much less then a GPU.