Heatsinks that are nickel-plated usually are not corrosive, and to most people, look better. Copper, as many of you know, is a better heat conductor than aluminum, but most cheap heatsinks are aluminum because it costs far less than copper.
Heatpipes are about two times more conductive than regular copper and they contain liquid inside of them, so it's not a good idea to lap (some people like to grind their heatsinks on fine-quality sandpaper for a flatter surface and therefore better contact between the CPU and the heatsink. This process is called lapping your heatsink.) your heatsinks with heatpipe-direct touch, heatpipe touch chip technology, etc since the heatpipes are coming into direct contact with the CPU and if you lap it, the heatpipe might leak. Also, do not cut the top of heatsinks off, or any other part to prevent leaks.
One of the most popular designs is 2-6 U-shaped heatpipes with aluminum fins soldered on to the heatpipes to maximize surface area with a fan on at least one side of the heatsink. This design is called the "tower design". Here are some heatsinks that use this design:
OCZ Vendetta/Vend.2
Thermalright Ultra-Extreme
Cooler Master Hyper TX2
etc.
Some heatsinks are huge, helping to cool the CPU but getting in the way of other components, such as fans, northbridge coolers, RAM sticks, the side panel, wires, and the top of the case.
More in about a day, stay tuned!
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