It usually starts with a sound: a fan that used to be quiet now roars during the simplest task, CPU temperatures climb to numbers you have never seen, and sometimes the machine shuts itself down at the peak of summer. In many of these cases the fault is neither the processor nor the cooler, but a thin layer between them that everyone forgets: thermal paste. This guide answers the question of when to replace it, teaches you how to tell worn-out paste from another problem wearing the same symptoms, and shows you how to pick the right replacement for Iraqi conditions.
Why does thermal paste lose its effectiveness?
The top of the CPU and the base of the cooler look smooth, but both are full of microscopic pits that trap air, and air is a poor conductor of heat. The job of the paste is to fill those gaps so heat can cross into the cooler. With repeated heating and cooling cycles the paste loses its carrier oils, dries out and cracks, and can migrate away from the centre of the chip in an effect technicians call pump-out. Air gaps return, temperatures creep upward, and the processor eventually throttles its own clock speed to protect itself.
How to decide the right moment to replace it
There is no single expiry date that fits everyone; the timing comes from a mix of age, operating conditions and real symptoms:
- Approximate age: review ordinary paste after two to three years of daily use; higher-grade compounds usually last longer.
- Ambient heat: in Iraq machines run through summer in rooms that get very hot during power cuts, and that genuinely shortens the working life of the paste.
- Dust: dust chokes the cooler fins and raises temperatures, and the paste gets blamed for it; clean the cooler first, then judge.
- A documented gradual rise: if idle or full-load temperatures are clearly higher than older readings from the same machine in the same season, that is a strong signal.
- Any removal of the cooler: whenever you separate the cooler from the CPU, clean both surfaces and reapply fresh paste, even if the old layer is only a month old.
- How the paste looks: if you find it dry and crumbly, or clumped at the edges with a bare centre, its job is genuinely finished.
Before you buy: rule out the easier causes
First check that the cooler fan actually spins, then the dust filters, the airflow inside the case, whether the cooler is firmly seated on all four corners, and whether the fan curve is set to a silent profile. Replacement becomes the right call once you are sure these factors are healthy; otherwise you will strip the system down, rebuild it and discover the temperatures did not move.
Cooler Master CryoFuze 5 Thermal Paste
A Cooler Master compound in a small tube that suits routine replacement on one or two machines. A straightforward choice for anyone who simply wants their PC back to normal temperatures, with a consistency that spreads easily on desktop processors.
Thermalright TF9 (1.5g) Thermal Paste
A 1.5 gram tube from Thermalright, which is the sensible quantity for someone servicing their own machine: enough for several applications on a desktop CPU, without sitting in a drawer for years and drying out before you finish it.
Thermalright TF9 (2.9g) Thermal Paste
The same compound in a 2.9 gram tube, meant for anyone handling more than one system: repair shops, gaming centres, or enthusiasts who keep swapping coolers and remounting. The cost per application drops sharply compared with the small tube.
Thermalright TFX (2g) Thermal Paste
The higher tier in the Thermalright line-up, in a 2 gram tube, aimed at anyone running a powerful CPU under sustained load or overclocking. Its consistency is relatively thick, so take your time spreading it and press the cooler down steadily without sliding it sideways.
When do you need a thermal pad instead of paste?
A thermal pad is not a substitute for paste on top of the CPU; it solves larger gaps: graphics card memory, VRM stages on the motherboard, and M.2 drive heatsinks. Here thickness is the critical decision: too thin leaves an air gap, and too thick lifts the heatsink and weakens its contact with the main die. Measure the gap or reuse the thickness of the original pad you removed, and never guess.
Thermalright Extreme Odyssey Thermal Pad 120x20x1.5mm
A 120x20 mm strip at 1.5 mm thickness, which is the most common size for graphics card memory and some M.2 heatsinks. Its long shape makes it easy to cut into small pieces matched exactly to each chip.
Thermalright Extreme Odyssey Thermal Pad 120x20x2.5mm
The same series at 2.5 mm, suited to wider gaps such as certain power stages or the space between the board and the backplate. Choose it only if you have actually measured the gap and found it to be that size.
ARCTIC TP-3 (100x100mm - 1.5mm) Thermal Pad
A square 100x100 mm sheet at 1.5 mm from ARCTIC, whose generous area lets you cut any shape you need instead of being limited to a narrow strip. Ideal for anyone repadding an entire graphics card in one sitting.
Thermalright Valor Odin Thermal Pad (1.5mm)
Another Thermalright option at 1.5 mm that sits in a higher tier of the range, for anyone who wants extra margin on a graphics card running under long loads. Treat it like any pad: correct thickness first, performance second.
Common mistakes during replacement
- Using too much: a pea-sized amount in the centre of the CPU is usually enough; the excess squeezes out the sides and does nothing for temperatures.
- Not cleaning the old layer: remove the old paste from both the CPU and the cooler with isopropyl alcohol and a lint-free cloth, then let both dry completely.
- Touching the surfaces: skin oils leave an insulating film on the metal, and the result makes the new paste look like a bad product.
- Replacing it for no reason: changing it every few months brings no benefit and raises the odds of damaging a screw or a socket at every remount.
- Uneven mounting: tighten the cooler screws diagonally and in stages so the pressure spreads evenly across the surface.
- The wrong pad thickness: buying a random thickness is worse than leaving the old pad alone; measure first, then order the matching size.
When you buy from Jowa Souq you pay cash on delivery with shipping to every governorate in Iraq, so you receive the item and check it before paying.
Frequently asked questions
How many years does thermal paste stay good inside a machine?
The practical rule is to review it between two and three years of daily use. High heat and continuous operation shorten that window, while good paste in a machine used only a few hours a day can last noticeably longer.
Does a brand new computer need a paste change?
No. The factory paste on new systems and new coolers is perfectly adequate at the start. Do not dismantle a healthy cooler just to change it, because the removal itself carries more risk than the expected gain.
What is the correct amount of thermal paste?
A single pea-sized dot in the middle of the CPU lid is enough in most cases, and the cooler pressure spreads it for you. Extra paste does not lower temperatures and can run off onto the edges of the socket.
Can I use paste instead of a thermal pad?
No. Paste is designed for a very thin layer between two touching surfaces, while a pad fills a gap with a defined thickness. Using paste where a pad belongs leaves an air gap and raises temperatures instead of lowering them.
What should I use to clean off the old paste safely?
Use high-concentration isopropyl alcohol with a lint-free cloth or wipe, and clean until the surface is shiny again. Avoid water and harsh solvents, and wait until the surface is completely dry before applying the new paste.
I changed the paste and temperatures did not drop, why?
The cause is usually a loose or uneven mount, a cooler clogged with dust, or poor ventilation inside the case. Recheck those points before blaming the new paste or buying another tube.
Practical summary
Replace thermal paste when two reasons meet: an age beyond two to three years, and a temperature rise that cleaning and ventilation cannot explain. And remember it must always be replaced after any cooler removal. A thermal pad is a completely different decision: start by measuring the thickness, then choose the piece, because one wrong size ruins the whole job. Handled in that order, a small amount of money buys you years of extra stability through the hottest days of summer.
