For those I suggest they read http://www.tomshardware.com/reviews/thermal-paste-comparison,5108.html
Or do like I do and get the top seller on Amazon or Newegg.
Currently running an ASUS 550ti that I purchased for $34 from China off eBay on a DQ67SW Intel board and a 3.1 Ghz i5, 8GB 1333mhz DDR3 that I actually traded for a few years back, as well as a donated 800W power supply. The entire setup is from used parts, and I know the thermal paste is dry and brittle by this point, namely because I've already checked under the heatsinks.
Thing is, this is my first time actually using a dedicated graphic card of this caliber, and I know the GPU runs a bit hotter than just your typical CPU. My i5 is currently idling at around 90F-100F, and GPU at about 105F. However, as soon as I launch a game, even as simple as Minecraft, it sounds like a jet engine as the GPU hits about 180F and my CPU about 130F.
What recommendations do you guys have for a decent, easy-to-use thermal paste that will be able to handle the heat? I don't mind curing, but knowing me, I'd need something that isn't electrically conductive.
I'm also looking into a better cooling setup overall, but likely won't get into that for a few months yet.