The Thermal Paste Showdown
INTRODUCTION
First off, lets educate you on exactly what thermal paste is and what it's used for.INTRODUCTION
Thermal paste (a.k.a thermal grease, thermal transfer compound, heat paste or heat transfer compound) is a creamy, pasty substance which is spread between the bottom of your heatsink and the top of your CPU. Why? Simply put: to improve the transfer of heat from your CPU to the heatsink.
Your CPU is made up of billions of electrical components, which all start to heat up when you put electricity through them. If it gets too hot then these components start randomly turning themselves off and on, disrupting the calculations the CPU is trying to perform. If it gets really hot physical damage can occur, rendering the device useless. The bottom line being, it is VERY important to make sure your CPU stays cool.
Here's where the problem comes in. The bottom of your heatsink and the top of your CPU may look flat, but in reality they are far from it. If you've got a powerful magnifying glass, take a gander at the bottom of your heatsink. The smooth, mirror finish you usually see suddenly gives way to a myriad of imperfections. This is bad for cooling, because it means the bottom of the heatsink won't be in full contact with the top of the CPU. Instead, there will be air pockets between the two, and air is a very bad conductor of heat. This means that instead of the heat being passed from your CPU to the heatsink, it stays in the CPU.
Thermal paste was created to solve this problem. It conducts heat a lot better than air does, improving the heat transfer between the CPU and heatsink dramatically. It oozes into all the little gaps and spaces between the two surfaces, smoothing out both surfaces and ensuring maximum contact is achieved.
It isn't nearly as good a thermal conductor as metal, however, so care should be taken not to apply too much. The goal is to fill all the gaps created by imperfections on the surfaces of the CPU and heatsink, but not block full metal-on-metal contact where possible.
TEST METHODOLOGY
Each paste was applied and left with the PC performing random tasks for 2 hours. It was then shutdown for 15 minutes, then booted and left idle for 5 minutes. After that, a 20 minute LinX run was started (utilising all available memory in every run). After the run, the PC was overclocked to 3.2Ghz, left shutdown for 15 minutes, booted and left idle for 5 minutes, then the 20 minute LinX run was started again. Room temperature was at a constant 22C (+/- 0.9C)
For most of the tests I did an extra remount, and if anything seemed out of place or strange, I wiped and started again. I also think it's worth noting here that I did three remounts for the Arctic Silver 5. I'm guessing that it needs every second of its recommended 200 hour curing time.
Test System Specifications
- CPU: i7 920 D0
- Motherboard: Asus P6T
- Heatsink: DBX-B on Performance mode
- 1x 120mm rear exhaust fan
- 1x 120mm front intake fan
THE PASTE LIST
(Prices sourced from Newegg.com, Jab-Tech.com, Amazon.com and AntaresPro.com)
(Prices sourced from Newegg.com, Jab-Tech.com, Amazon.com and AntaresPro.com)
Noctua NT-H1
- 3.5g - $9.99
- Excellent Performance
- Maximum ease of use & efficient dosage
- Top-performance right from the start
- Excellent long-term stability
- Not electrically conductive, non-corroding
- Suitable for compressor cooling
- Technical specifications
OCZ Freeze Extreme
- 3g - $7.99
- Oxidation / ozone / solvent resistant
- No curing time needed
- Non-electrically conductive
- Non-Toxic and Environmentally Safe
- For use on ALL socket type CPUs
- Easy Application
- Technical Specifications
Arctic Silver 5
- 3.5g - $9.99
- Contains 99.9% pure silver
- Contains over 88% thermally conductive filler by weight.
- Controlled Triple-Phase Viscosity
- Not Electrically Conductive
- Does not contain any silicone
- Technical Specifications
Arctic Cooling MX-2
- 4g - $9.98
- High Thermal Conductivity
- Low Thermal Resistance
- Non-Electrical Conductive
- Non-Capacitive
- Non-Curing
- Non-Corrosive
- No Bleeding
- Odourless
- Technical Specifications
Tuniq TX-2
- 3.5g - $4.99
- Low thermal resistance for superior heat transfer, 4.5W/Mk
- Thin bond line for high efficiency conductivity
- Low bleed under high pressure
- Spreads easy - clean consistency
- RoHS compliant
- Not Electrically conductive
- Technical Specifications
Tuniq TX-3
- 3g - $10.99
- Extreme performance
- High stability and reliability
- Not electrically conductive
- Low bleed under high pressure
- RoHS compliant
- 6.2W/mK Ultra-High thermal conductivity for superior heat transfer
- Helps the low-pressure clip design of cooler to achieve better cooling performance
- Technical Specifications
Thermalright Chill Factor
- 4g - $3.99
- Electrical impedance and thermal resistant
- Contains no health hazardous chemical and non-electrical conductive
- Easy application, spreads easily, and easy to clean
- Generous volume and competitively priced
- Technical Specifications
Innovation Cooling Seven Carat Diamond
- 1.5g - $9.99
- Superior bulk conductivity
- Excellent thermal impedance
- Tight particle distributions
- < 40 µ maximum particle diameter
- Silicone free
- Greater stability
- Non capacitive or electrically conductive
- Technical Specifications
Arctic Silver Matrix
- 2.5g - $5.95
- Not electrically conductive.
- 2.5 gram syringe
- Matrix's silicone suspension fluid and conductive fillers are engineered for easy application and superior surface wetting.
- Unique blend of micronized Zinc Oxide, Aluminum Oxide, and Aluminum particles in silicone base oil forms a thermally conductive matrix
- Technical Specifications
TC Grease 0098
- 2.5g - $4.99
- Original TIM Consultants Thermal Grease
- Silicone Backbone, Aluminum, Aluminum Oxide, Zinc Oxide filler
- Bondlines as thin as 2 mils and very low contact resistance for superior thermal impedance
- Very reliable - will maintain functionality under extreme conditions
- Technical Specifications
Shin Etsu G751
- 1g - $4.99
- Non-conductive
- Easy application
- Syringe ideal for manual applications
- Technical Specifications
RESULTS
CONCLUSION
CONCLUSION
Out of all the pastes I tested, my top pick would be the TX-2. Easy to work with, and one of the best performers of the lot, it's still holding its own against the newer pastes. Second place goes to OCZ's Freeze Extreme. It was the easiest out of the lot to apply, which is good for those who are less experienced in the proper application of thermal pastes, and it performed very well.
RATINGS
I would like to thank the below companies for allowing Tech-Forums to review their products, and we look forward to evaluating more of their products in the future.