Microsoft-Windows-Vista Certifications Exam 70-620
Filed Under (Apple) by admin on 05-09-2008
The thermal resistance of standard 70-528 coolers for PC CPUs is usually not specified by the heatsink manufacturers, and if it is, it’s often inaccurate or intentionally skewed for marketing purposes. You cannot judge heatsink performance by comparing θ specifications from different manufacturers.
The θ values specified by manufacturers specialized in heatsinks for industrial applications (especially large passive heatsinks) are usually more accurate, though.
Heatsink testing is not an 70-297 easy task; many of the heatsink reviews found on the countless cooling-related sites on the net are not done properly. Check out my article about common mistakes in heatsink reviews to help you read reviews critically and decide which review to trust.
Heatsink materials The thermal conductivity of the heatsink’s material has a major impact on cooling performance. Thermal conductivity is measured in W/mK; higher values mean better conductivity. As a rule of thumb, materials with a high electrical conductivity also have a high thermal conductivity. See this Wikipedia article for more information on thermal conductivity.
Alloys have lower thermal 70-620 conductivity than pure metals, but may have better mechanical or chemical (corrosion) properties.

