Loading your content...
Learn how dried thermal paste affects CPU/GPU temps, how to diagnose and reapply safely, and where to source replacement compounds in South Africa.
Higher temps, fan ramping, throttling and brittle residue indicate dried paste.
Clean with isopropyl alcohol, apply a thin even layer, reseat heatsink, then retest.
Compare thermal pastes, check branch pickup and VAT invoicing for education or procurement.
Thermal paste (thermal compound) fills microscopic gaps between a CPU/GPU package and its heatsink so heat flows efficiently. Over time the paste can dry, pump out, or lose thermal conductivity. This guide explains what happens when thermal paste dries out, how to spot the symptoms, and how to safely restore cooling using products available locally in South Africa.
Measure using software (e.g., HWMonitor, Core Temp) or motherboard BIOS. In South African conditions - where ambient temperatures can exceed 25-30°C in summer - even small increases in thermal resistance matter. Compare idle and load readings against expected ranges for your CPU/GPU model. If load temps are 10-20°C higher than typical for the same workload, dried paste is a likely culprit.
Heat flow across the thermal interface can be approximated with:
Q = DeltaT / R_th
Where Q is heat flow (W), DeltaT is temperature difference (°C), and R_th is thermal resistance (°C/W). Dried or poorly applied paste increases R_th, raising DeltaT for the same heat flux. For example, if R_th rises from 0.2°C/W to 0.5°C/W on a 65 W CPU, DeltaT increases by (0.5-0.2)*65 = 19.5°C (estimate).
| Characteristic | Fresh/Correctly Applied | Dried/Compromised |
|---|---|---|
| Thermal conductivity | Higher (low R_th) | Lower (higher R_th) |
| Mechanical texture | Smooth, paste-like | Crumbly, tacky, or powdery |
| Effect on temps | Lower idle/load temps | Elevated idle/load temps, throttling |
Many makers, students and technicians in South Africa prefer accessible, mid-cost compounds for routine rework and higher-performance greases for overclocking. Communica stocks a range of thermal pastes and pads across categories - see the collections for thermal management to compare types and brands best thermal management products for electronics. For branch visits and collection times check local branch hours electronic cooling solutions in south africa. For a quick browse of all stocked products consult the full index where to buy thermal paste in south africa.
Note: in hot South African ambient conditions, re-evaluate thermal interface every 12-24 months for desktop systems under heavy use; laptops may require service sooner depending on cooling design.
Before replacing thermal paste, remove the heatsink and inspect the interface. If the compound is brittle, has separated into layers, or resists spreading, clean it off and reapply. Use isopropyl alcohol (70%-99%) and lint-free wipes. When reapplying, use a pea-sized or thin line method depending on CPU size and heatsink design; aim for a thin, even layer after the heatsink is seated.
Selection depends on application: budget-friendly silicone-based pastes suit general-purpose builds and student projects; ceramic and metal-based compounds offer higher conductivity for demanding builds. Avoid electrically conductive metal pastes near exposed pins unless you are experienced. Compare product datasheets on brand pages when deciding; Communica's shop-by-brand index helps locate options stocked locally where to buy thermal paste in South Africa https://www.communica.co.za/pages/shop-by-brand?utm_source=straider&utm_medium=referral&utm_campaign=prebo-digital.
Assume a 65 W CPU where dried paste increased R_th by 0.25°C/W. Estimated DeltaT reduction after reapplication = 0.25°C/W * 65 W = 16.25°C (this is an illustrative estimate; actual results vary with heatsink, mounting pressure, and airflow).
Communica supplies a variety of thermal pastes, pads and tools suitable for makers, tertiary students, and technicians. If you need account quotes or VAT invoices for education or procurement, Communica supports invoicing and branch pickup options - see the About Us page for company details and service scope https://www.communica.co.za/pages/about-us?utm_source=straider&utm_medium=referral&utm_campaign=prebo-digital. For brand choices and compatibility, browse the thermal management collections and compare specifications before purchasing buying thermal paste for electronics https://www.communica.co.za/collections?utm_source=straider&utm_medium=referral&utm_campaign=prebo-digital.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
Get answers to common questions about Power And Thermal Management
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
