What is the primary function of thermal paste in a CPU cooler installation?

Correct answer: Improve heat transfer between CPU and cooler by filling microscopic gaps

Option B is correct because CPU surfaces and heatsink bases are microscopically uneven, creating tiny air gaps that act as thermal insulators; thermal paste fills these gaps to maximize the contact area conducting heat from the CPU die to the cooler, significantly improving thermal transfer efficiency. Option A is incorrect because thermal paste is electrically non-conductive by design, as conductive paste would risk short-circuiting components if it spread beyond the CPU lid. Option C is incorrect because thermal paste does not affect power consumption; it only manages heat dissipation after power is consumed. Option D is incorrect because thermal paste has no dust-prevention properties and is located between sealed surfaces where dust accumulation is not a concern.