What a creative Idea!
This worked great! I taped the wires (cut the fan connector off) and had no problem -thank you so much.
The Surface Pro 3 I7 256 runs a lot cooler. Maybe 10c-15c cooler (50-54c) than when I used the external USB fan , (60-69c).
The fan is noisier than the USB plug in fan, but not obnoxious or too loud. . .
I have used coretemp to measure SP3 I7 temperatures and also CPU speed since I purchased the machine several months ago (Upgraded from I5). I have not notice much change in the CPU speed --perhaps it is operating a bit longer at 2.9 Mhz, but maybe I am imagining a performance gain.
I don't run any games --just a lot of apps, and sometimes a CPU-intensive activity like full scan, while working other things. Several statistics, MS office and web pages all open at the same time. . . .
Thank you again!