What exactly does this stuff do? It seems like it's pretty important to computer building. And also, how do you apply it? And to what?

The surfaces of CPUs and heat-sinks, no matter how perfectly flat they may look, contain microscopic pits and valleys. These pits and valleys trap air, which is one of the worst conductors of heat imaginable, and this is where thermal pastes comes in. Thermal paste is designed for optimal thermal conductivity and is used to fill in all of those little pits and valleys to provide molecule to molecule thermal contact. This translates into lower temperatures, longer component life, and no burnt out CPUs. NEVER run a computer without a heat-sink and thermal paste installed, it can take only seconds to permanently damage or destroy your CPU.There are many different levels of quality among thermal pastes. The stuff that comes with pre-built computers or packaged with processors and most heat-sinks are considered the bare minimum while Arctic Silver is considered by most to be the best available. Arctic Silver claims that Arctic Silver 5 will lower CPU temperatures by 3-12°C over standard pastes with most actual users say it lowers it by 10°C.As to how to install it. Consult the manufacturers website of whatever thermal paste you purchase and in lieu of that try the heat-sink manufacturer, the processor manufacturer, or the internet in general. The directions for Arctic Silver can be found at http://www.arcticsilver.com/methods.html. You may want to consult YouTube after reading up on the official method to see it done in practice before doing it yourself.

Does this stuff ever expire? I have a tube that is about 10 years old and I'm not sure if I should use it or buy a new tube.

If still in un-opened tube or properly sealed tube it should be fine. I've heard people have used after 6 years with no issues, but that is with a complete un-opened tube. However, just make sure the connection to the heat sink and CPU is cleaned thoroughly before applying. If after; using your own 10 yr old tube, and find the temp of your CPU running a little high then I would recommend buying a new tube. Actually, I would recommend buying a new tube anyway. This tube is small and will work for a few installations. That way, why hassle with getting it done with your tube only to find out it hasn't held well over the years. Good luck.

How often should thermal paste be replaced? I have a i7 i have had it about 4 years? wondering if it needs to be done. No temp issues with cpu.

I used to use only Arctic Silver 5 for years of building computers. About 4 years ago I noticed some of the computers CPUs were running hotter than expected. I pulled off the CPU coolers to find that the arctic silver had turned into a solid. It was like the coolers were welded to the CPU and in some cases I couldn't remove the cooler without the CPU coming off with it. These machines were around 3 to 4 years old. After replacing the arctic silver with new paste they ran better and cooler than when I originally built them. I do believe this stuff used to be the "best" (like 6 or 7 years ago) but now there are much better options that last longer without losing their heat transfer capabilities.

My temps on my i7 are now hotter than when I was using the compound that came with the cooler (the cooler master kind). I had to lower my clocks because the temps were getting too high! Is this normal?

I have the same problem with my AMD FX8350 CPU and THAT is using Corsair H100 Water cooling with fans (4) in push/pull setup.I have full coverage and used "Artic Silver" before; yet I am running at 60-C TOO HOT..Some answers state too much grease; you really can't use too much as all the excess would squeeze out and around the cpu ( which isn't good either.) The claim made by Artic Silver is a number of heat cycles to set the particles. Meaning computer turned off cooled down and booted back up a number of times. Temps are also influenced by the rooms temperature the computer is in as well. As I've said I have used this product and can not explain why I am getting these temps? I removed the product and used the thermo grease I have been using. NOW my temps are at CPU idling 29-C and full all eight cores at 125w CPU 4.3 Ghz 100% load 45-50 C.

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❄️ Chill smarter, not harder: Arctic Silver5 keeps your CPU cool and your workflow cooler.

SAFE STABLE - Non-electrically conductive formula means zero risk of short circuits, ensuring peace of mind during intense workloads.
LONG TERM RELIABILITY - Won't separate, run, or dry out—maintains peak performance so your rig stays cool and efficient over time.
SILVER POWERED COOLING - Harnesses 99.9% pure silver particles to turbocharge heat transfer and keep your CPU chill under pressure.
THERMALLY DENSE FORMULA - Packed with 88% conductive fillers including zinc oxide and boron nitride for next-level thermal performance.
TRIPLE PHASE VISCOSITY CONTROL - Engineered to flow perfectly on application, then stabilize for lasting, reliable contact—no mess, no migration.

Arctic Silver5 Thermal Compound is a premium 3.5g tube of high-density thermal paste featuring 99.9% pure silver particles and advanced ceramic fillers. Designed for professional-grade heat dissipation, it offers controlled viscosity for easy application and long-term stability without electrical conductivity risks, making it the go-to choice for maintaining optimal CPU temperatures and system reliability.

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Brand	Arctic Silver
Product Dimensions	10.9 x 6.35 x 15.24 cm; 3.5 g
Item model number	AS5-3.5G
Manufacturer	Arctic Silver
Series	AS5-3.5G
Color	Silver
Processor Socket	[ANY_COMMONLY_USED_CPU_SOCKET]
Wireless Type	802.11a
Operating System	Windows 7
Are Batteries Included	No
Item Weight	3.5 g

Arctic Silver5 Thermal Compound 3.5g Tube

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