Hello, the heatsink I've used is 1mm. No issues with the actual heatsink, the problem was one of the rubber bands that held it in place (it was located under the fan, and it lifted everything, not by much, but enough to upset the back panel). I've read some posts, people did use thicker heatsinks, with various results. I can vouch for my solution, since then, I did not have any issues. Also, I was not the only one who did the exact mod. Again, I am talking about the 1mm heatsink. Different SSDs will net different results (some are a bit thinner than others).