Hi, this is my first post on Legit Reviews.
My Dad (Scott Loves Dogs) used the Indigo Xtreme "Engineered Thermal Interface" when he recently upgraded his system (see his signature) from an Intel E6600, OC'd to 3.2GHz, to an X6800. When installing the Indigo Xtreme, there is a "reflow" procedure that involves turning off all the cooling system, and the BIOS protective mechanisms. The motherboard is placed horizontal, not close, but horizontal. You then run a temp monitor that will graph, Speedfan will do, in graphing mode, and a stress program, Prime 95 will work. The C{U should be heated up to about 90 deg. C, after a few, or several, seconds the temp. will drop, then climb back up to about 90 deg. C. When the temp stabilizes at 90, the Indigo Xtreme has reflowed and the computer can be turned off and set back to normal.
As soon as Dad started up Prime95, his computer let out a loud SNAP that sounded like the CPU had popped from severe overheat and shut off. It never did the proper reflow graph. It did start up after a cooling off period, though. He is using it now, OC'd to 3.4GHZ, but he says the temps are no better than the Shin-Itsu X23-7783D that he used for a few days on the X6800 to play with it before permanent installation. In fact, the idle temps are higher than the E6600 w/Shin-Itsu, at 3.2GHz he removed.
He is going to email Indigo Xtreme about the problem he encountered, and he or I will post the response if you like.
Meanwhile, he says the Shin-Itsu X23-7783D seems to test far better than all of the other compounds, and very close to the Indigo Xtreme. Depending on the response from Indigo, he may remove the Xtreme from his computer and reinstall with the Shin-Itsu. Here is a review of the Indigo and Shin-Itsu stuff at Skinneelabs, it is pretty thorough:
http://skinneelabs.com/thermal-paste-v1-1/