I understand, that your numbers are valid for your CPU (i7-3770). My case is more from lower end but I'll try to translate your results into my world taking into consideration BillyR numbers with his i7 950 when producing 34 min clip in 112 sec.
Maybe I am not very accurate, but taking my CPU (2x Xeon 5130), it takes +/- 1 hour to produce 1 hour clip. Yes, believe me or not, it is 1 hour! So I can assume, that any middle level video card will speed up my processing dramatically. In my case, gaining 1 hr clip produced in 10 min means 6 fold acceleration.
Am I right? _______________________________
regards, Tom
(PD365, Win10 Pro x64, Dell Precision T3500, Xeon W3670, 12GB, SSD)