Actually the first thing you'll want to do is turn your computer case upside down so the heatsink is OVER the GPU... then try overclocking.
Somehow the engineers have never been told that western computers have the heatsink below the card in most the cases,
The intended fluid "wicking" does occur but any time you get close to the engineering spec on the heatsink the fluid starts to vaporize long before it reaches the spreader and you can actually get into a "vaporlock" state where you're cooling the card on the heat conductivity of the chamber wall alone.
Its a sad sad world where manufacturers fold and compress the vapor chambers and tubes thus marginalizing any gain from the vapor technology.
Secondly I found this thread by searching "ungine" and I have yet to see this benchmark utilize more than 84% of my 7970's core. That's like doing dyno tests on a Veyron using a Ferrari's computer.
You're missing the point of a test.