text: which is a better conductor of heat: copper or aluminum? i need to know inorder to place new ramsinks on my video card, an i want the best ones to wisk away heat as fast as possible, the same would go for the northbridge chipset. aliminum, it is a better conductor of electricity and heat rather than copper, but aliminum can shrink when exposed to heat for a longer period of time, but remains quite cool after heat exposure.