I couldn't get a good picture of the heatsinks surface, but it had fairly deep
grooves left over from machining, despite looking shiny. I used Arctic Silver
paste rather than the dodgy "50% Silicon, 20% Carbon, 30% Metal Oxide"
stuff that came in the box.
Almost ready to rock:
Fitting the thing was a little fiddly as you have to lay the heatsink on its
back and then place the card over it, before fixing that clip through the back
of the card. Here's the "gap" between the heatsink and GPU - A snug
fit.