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Thermal Paste Comparison, Part Two: 39 Products Get Tested

Thermal Paste Comparison, Part Two: 39 Products Get Tested

It's time for the numbers. In addition to testing liquid metal compounds and thermally conductive adhesives, each paste is discussed on its own merits before we chart out the results of four usage cases. After all, these products behave differently.

If you missed part one of this series, take a quick second and check out Thermal Paste Comparison, Part One: Applying Grease And More.

We Are Curious About Two Special Compound Categories

After discussing the theory of conventional thermal pastes in part one, I want to go into a little more detail about liquid metal compounds, and also shed some light on thermal adhesives, both in paste and pad form. Thermal pads are used to mount small heat sinks on RAM chips or MOSFETs.

But let’s start with those liquid metal pastes. While their theoretical thermal conductivity sounds impressive, that one attribute is no guarantee of success. During the course of our testing, we'll be experimenting with a long burn-in phase and comparing the liquid metal compound to Gelid's Extreme paste.

Several years ago, Coollaboratory broke new ground in thermal management by introducing the Liquid Pro liquid metal compound. But while the look (and subsequent application) of Liquid Pro reminded us of a mercury thermometer that didn’t survive a fall, its successor, Liquid Ultra, is better, avoiding some of the first effort's weaknesses. Because Liquid Pro could be so problematic, I'm only presenting Liquid Ultra in the tutorial section. Both compounds show up in our performance charts, though.

Box Contents

In the Liquid Ultra box you get the paste itself, a cleaning swab, two brushes, a sponge, and an instruction manual. That's an impressive-sounding list, but it's really just the bare minimum to use the product, sufficient for a single application. If you want to apply Liquid Ultra a second time, you'll find yourself without the alcohol swab. At least a second brush is included. While we appreciate the inclusion of the coarse sponge, it's barely adequate for removing the compound. Of course, there's a separate cleaning kit available for a hefty price.

Enthusiasts may be torn about this product, and yes, there may even be those who are more courageous than I and use it on graphics cards. However, my personal opinion is that a majority of the people who read this tutorial are new to thermal compounds, and I wouldn’t want to encourage them to mess around with this stuff due to the skill it requires. I also want to point out that you'll probably void your CPU's warranty if you do use Liquid Ultra. After removing the last remnants of it, we discovered that all of the markings etched into the head spreader were gone. If you still want to try this product after reading our tutorial, you can probably expect very good cooling performance, assuming nothing goes wrong.

Surface Cleaning and Roughing

The most important prerequisites for using a liquid metal compound are clean heat sink and spreader surfaces. You can buy the aforementioned kit with the three cleaning liquids, or simply snag some isopropyl alcohol at the drug store. However, stay away from acetone and cleaning naphtha. Even denatured alcohol may contain additives that are detrimental to achieving a clean, degreased surface. Finally, make sure you wait until any remnants of the liquid have evaporated!

Coolaboratory Liquid Ultra - Cleaning the CPU

If the surface is too smooth, the older Liquid Pro and newer Liquid Ultra may only form loose droplets on your CPU. Thus, in contrast to what you would do for regular thermal pastes, you may consider roughing the heat sink and spreader a little bit. Just remember that you only get enough liquid metal for two tries.

Don't overdo this. If you scrub too hard, the innocent-looking sponge can cause deep grooves. Move in small, graceful circles.

Display 130 Comments.
Top Comments
  • 26 Hide
    rolli59 , October 20, 2013 9:15 PM
    As good as the first part!
Other Comments
  • 26 Hide
    rolli59 , October 20, 2013 9:15 PM
    As good as the first part!
  • 7 Hide
    dragonfang18 , October 20, 2013 9:28 PM
    I loved the toothpaste part. What about Vicks Vaporub? I wonder how that thing would do.
  • 5 Hide
    Azn Cracker , October 20, 2013 9:30 PM
    Yeaaaa! nice in depth article. Disappointed that cheese was not use as a paste :( 
  • 6 Hide
    ledpellet , October 20, 2013 9:33 PM
    Can you test Antec Formula 7 NANO DIAMOND Thermal Compound?
  • 24 Hide
    TehDudeMan , October 20, 2013 9:41 PM
    Great article guys! As a reader for over 10 years pretty much daily, this reminds me of the old Tom's Hardware. These type of in depth articles on enthusiast products are what I love.
  • 6 Hide
    Matt Edwards , October 20, 2013 9:55 PM
    A great article, agree the application of the compound, not the compound itself is most important.

    Like ledpellet I too am curious about these diamond compounds. Wonder if it offers similar results to the Coollaboratory products with an easier application, or if the results simply don't justify the price. E.g in Australia, Innovation Cooling IC7 Diamond 7 Carat Thermal Compound Paste - 1.5G can be found for as much as $25. The cheapest I have managed to find it for is $15. For that price it would want to be good considering the leading GELID GC Extreme, can be found for around $8.
  • 7 Hide
    TerranTerrance , October 20, 2013 9:58 PM
    Adding Ceramique would be greatly appreciated!
  • 19 Hide
    danwat1234 , October 20, 2013 10:03 PM
    Coollaboratory Liquid Ultra isn't all that good after a year of hard use. In fact, it completely hardens / dries. On my X9100 after 9 months of nearly 24/7 100% load, I started seeing high temps and after 1 year auto shut downs while crunching. Turns out it was shutting off because it hit the 105 C thermal protection.
    Opened it up; thermal compound was as hard as a rock. has to pocket knife blade and sand it down.
    So for longevity it sucks. That is something to consider, not just initial performance, but performance months and years down the road. Especially for laptops that aren't designed to be opened up frequently for repasting.

    After trying Liquid Ultra many times and having it fail on me, I've put on Arctic MX-2 that has a supposed 8 year durability rating. Initial performance is great, we'll see how it lasts (been 3 weeks so far).
  • 0 Hide
    slomo4sho , October 20, 2013 10:06 PM
    CLU and Arctic MX-4 are both great products. MX-2 and MX-4 can often be found free after rebate so they are an exceptional value.
  • 2 Hide
    CaptainTom , October 20, 2013 10:45 PM
    More things like this! Articles like this will keep me here more often!
  • 2 Hide
    John Goodman , October 20, 2013 10:59 PM
    Was really hoping you'd test IC Diamond, since that's what I've always used. Bummer.
  • 1 Hide
    stickmansam , October 20, 2013 11:08 PM
    You could do a giveaway for the thermal pastes :p  and include Canada this time :) 
  • 2 Hide
    iam2thecrowe , October 20, 2013 11:13 PM
    would have liked to see a test without thermal compound. Have used noctua nt-h1 for ages now, no curing time sells it for me.
  • 3 Hide
    radiovan , October 20, 2013 11:20 PM
    All the hype aside, could Tom's include an actual industrial "Silicone Heat Transfer Compound", such as the one by MG Chemicals :, any of the future comparisons. If this stuff is good to use in mass industrial applications, how can it not be any better then let's say AS5.

    Plus, AS5 can short out your mobo if some of it gets on the PCB and it costs 10 times as much as the industrial stuff and I don't think it is 10 times better.
  • 0 Hide
    rwinches , October 20, 2013 11:27 PM
    Coollaboratory Liquid MetalPad sounds ideal.
    Might there be a way to achieve proper bond by heating the pad as well as getting the cpu hot?
    I guessing this would be most ideal for GPUs though, as they want to get very hot.
  • 0 Hide
    milktea , October 21, 2013 1:20 AM
    Great article!

    BTW, is the Cooler Master Extreme Fusion X1 available in the USA?
  • 9 Hide
    PreferLinux , October 21, 2013 1:50 AM
    It would have been nice to see the stock thermal paste on the Intel cooler too...
  • 0 Hide
    HazardManiac , October 21, 2013 1:57 AM
    I just ordered the liquid pro and I'm already starting to regret it...
  • -8 Hide
    Technoart , October 21, 2013 2:46 AM
    You guys should see how big tube of thermal paste and how big is the thermal tape that are available inside AMD. All of this product are obsolete.
  • 0 Hide
    dish_moose , October 21, 2013 2:58 AM
    Nice article ... one small boo-boo "leaning toward the software compounds." on page 21 should be softer.
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