[components were just clear of heatsink]

Once I had worked out the best way round, I clipped the cooler on the existing 478 bracket and clip the brackets into place, using the brightly colour screwdriver, that was supplied.

Testing
My method of testing is pretty straight forward, but gives pretty good results. I tested the stock cooler on idle and 100% usage for 30 minutes each, then did the same for the SHS-X500. Motherboard monitor was used to take the measurements, every 30 seconds.