Used MX-2 for half a dozen rigs in the last couple months. Not sure if it's doing any better than my Arctic Silver 5, but it's definitely working well. Also not sure how much better MX-4 is than MX-2, especially when the latter was about $2 a while back.
Also, 4 grams goes a long way when you're using a dot about the size of a 3.5mm audio jack. Average user probably has no use for 40.
MX-4 is pretty good, but those who want a little extra cooling power should use Gelid GC Extreme or PK-1 or Thermalright Chill Factor 3, as it doesn't cost much more than MX-4, but it is about 1.5 degrees C cooler for typical (moderate) contact mounting pressure: http://skinneelabs.com/2011-therm...parison/3/ (Phobya HeGrease is the same as Gelid GC Extreme... for the curious, Indigo Extreme is WAAAY more expensive than any other option and imho not worth it when PK-1 and Gelid GC Extreme are much cheaper and almost as good).
Those who don't care about 1-2C differences may as well just stick with MX-2 which is very frequently on sale for less than MX-4.
Arctic Silver 5 is old school... it isn't that great (it's way down there on the Moderate Contact chart, 8th from the bottom; though it does better if you mount your cooler with high pressure... take care not to flex/bend your PCB when applying high pressure mounting), takes a long time to "cure" (way longer than most other thermal pastes), and it's conductive which is a no-no if any gets onto the circuit board. Yeah it's cheap, but so is MX-2.
Last edited by goldchocobo; 08-13-2012 at 11:16 PM..
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