Highly doubt it mine where I have done the swap is still under warranty for another 2 years if it ever dies in that time frame I am going to put back in the old cpu, ram and video card if still dead then back to Apple it goes.
+1
If you get the right long-handled Allen Wrench, removal/reinstallation of the heatsink is very fast. The job is only time-sconsuming if updating the dual CPU 2009 4,1 Mac Pro. Yours will be very easy.