Encoding time is 3 hours, 47 minutes without hardware acceleration or 3 hours, 43 minutes with it enabled. I wouldn't exactly call a four minute improvement "accelerated".
I have a brand new GTX750 graphics card. I am currently using the 337.88 driver, but I tried a few different driver versions with similar results. Computer is i7-4790K, 16GIG RAM, two 1TB SSD drives.
So far, I don't see that hardware acceleration really does anything? Anthony Watson
www.mountainsoftware.com
www.watsondiy.com