I ran video encoding tests on both machines, as well as other performance benchmarks, and the i7 obviously outperforms the i5. In a 27 min encoding to a single 1080p 60fps mp4 through Windows Movie Maker I saw a gap of 20% which resulted in a 10 min difference in completion time. This is typically the largest length of video I convert. I will be running tests tonight on 2.7k video about 30 min long, multiple files combined in Premiere but might try other software.
I noticed the i7 runs up to 20 degrees warmer than the i5, 88 versus 68, though the i7 will sometimes come down to 78 during the encoding. I am still not sure if I want to keep the i7 or return, cost difference was $250 and I only really encode video about 10x a year or so after my track events. I might exchange the i5 as I have the WiFi disconnect issue and I am almost out of my return period, I know we have determined it is driver based.
I used the i7 this weekend to watch Netflix and the fan didn't activate at all as far as I could tell, so likely it was on low mode. However, it will activate randomly when web browsing or doing some other tasks where I don't see the i5 activate. I have been using the Intel XTU to monitor the system information.
The i7 is lot 1430 and the i5 I believe is 1429, not in front of me at the moment.