Originally Posted by DaveLT
It contains gallium ... that stuff wrecks aluminium heatsinks and i'm pretty sure IHSs are made of aluminium which you WILL kill your IHS that way and eventually your processor
And not all metals are conductive. Like anodized aluminium
The IHS is not aluminum. It is nickel plated, not sure of the base metal but it's not aluminum. Many here have lapped their IHSs and used Liquid Ultra to no ill effect so it can't be aluminum. It's possibly brass but I am not sure. But it is nickel plated. I do believe the Intel stock coolers are aluminum (they are crap too, never bothered to look at any of mine and just threw them away (oops, recycled, for those politically correct out there) so yea using Liquid Ultra/Pro with that would be a big mistake (and crazy btw).
I've been a Ceramique fan for ages, and also like Alumina, but time and science march on. Never warmed up to AS4 or 5, too thick to use the pea method and get a good spread, and I am not one for having to spackle on TIM. Didn't see improvement over Ceramique anyway.
Shin-Etsu makes some fine TIM. In applications where there may be aluminum on the cooler they would be a good choice. For copper, Liquid Ultra rules. It's a ***** to remove, but easier than Pro, and is IMO the best choice on a delidded 3770k.
There are several rather good thermal paste shoot-outs on the net, with a number of stand-out performers that came in within 1 or 2c of each other. Pick your poison, being careful not to use the gallium stuff on aluminum, or the diamond stuff on a bare die (I would not risk scratching up the die surface) and be happy.