I'm not really willing to risk damaging the card to try direct contact with the aluminium sink at the moment. As the VRMs are only hitting 80 C, I imagine they are pretty safe. The point of the new fans was to try and reduce noise and help temps, but the VRMs start to go over 100 with the fans I tried. I believe the thermal paste I have is non conductive, but I don't feel that comfortable gooping it all over the PCB. If I had a card I could replace, then I would. I like the idea of putting a heat sink on the back of the pcb, but making sure it stays there would be an issue. The 92mm fan is something I may try at a later date, but the main problem is that the fan housing is circular and blue; it won't work well with the other 2 fans. I may be able to get some stuff from the US come December, I'll have a look around at what I can find.