Thermal paste sits between your CPU heat spreader and your cooler's contact plate. Its job is simple: fill microscopic air gaps that would otherwise create insulating pockets, improving thermal conductivity. Despite what some enthusiast forums suggest, the difference between good and excellent thermal paste is a few degrees Celsius — meaningful for extreme overclocking, negligible for normal use.
How Much to Apply
The most common approach — and the one that works reliably — is the pea-sized dot method. Place a small pea-sized amount in the centre of the CPU heat spreader (the metal lid). When you press the cooler down, it spreads the paste evenly. Do not pre-spread it; this often introduces air bubbles.
The X pattern and rice grain amounts you see in various guides also work fine. The important thing is even coverage without overflow onto the motherboard socket.
What Type to Use
For most users: any mid-grade thermal paste (Arctic MX-4, Noctua NT-H1, or similar) is more than sufficient. The performance difference between a ₦3,000 paste and an ₦8,000 premium paste is 1-3°C — not meaningful for standard use.
Liquid metal thermal paste (Thermal Grizzly Conductonaut) offers 5-15°C improvements over standard paste. But liquid metal is electrically conductive — if it spills onto the motherboard, it can cause a short circuit. Only recommended for experienced builders on specific configurations.
When to Replace It
Thermal paste does not wear out quickly. Modern quality pastes maintain performance for 5-7 years under normal conditions. The sign that it is time to replace: CPU temperatures that are noticeably higher than when the system was new, or a system that used to run quietly but now runs fans at higher speeds under the same workload.
In Nigerian conditions where ambient temperatures are higher, regular checks (annually, not every few months) are a reasonable practice if you notice increasing temperatures over time.