Hi, repasting the M14X is a must, whether you use the IC Diamond or Arctic Silver (as I did).
The gain in temps it's quite important, in my case I passed from 85-89 on CPU with turbo and 75 on GPU to 78-82 CPU with turbo and 69-71 on GPU.
Same values with the GPU clocked at 740/900.
As I took apart my M14X three times already, the only thing I recommend the most is TAKE CARE ABOUT THE WIFI LED PLUG!!! On the motherboard side, this little thing is very sensitive: to me happened that the rightmost pin angled (because in pulling off the connector it tents to slide to the left) and - obviously - the caps led and the wifi led didn't work anymore.
As I thought that it was the led piece not working any more, it took me about two weeks to realize that was the pin of the mobo connector out of place, so I managed to gently fix it with a little needle (an hell of a work).
To avoid breaking your nerves (and almost kill your wives and parents), mind this