||50x50x10mm Ball Bearing x2|
What makes a good cooler?
The job of the heatsink is to draw heat from the processor, and radiate it to the surrounding air. That means that bigger heatsinks are better, right? Size is good, but a big solid block of metal won't be an efficient heatsink. Good heatsinks must have a lot of surface area in order to be able to radiate as much heat as possible. A solid metal block with 5 exposed sides only has a small amount of surface area to radiate heat. That's why heatsinks have fins, and some heatsinks like the Alpha have an insane number of very thin fins. Most fins are crosscut to allow air to flow along both the x and the y axis.
The Vantec heatsink has 9 fins (11 if you count the outside edges). You can also see the crosscuts in the side view.
What kind of metal?
Most heatsinks are made out of aluminum. Other metals such as copper and silver would make better heatsinks, but aluminum is cheaper than silver and easier to work with than copper. The Vantec heatsink is anodized aluminum. The anodizing aluminum improves the heatsink's heat transfer abilities.
You need a fan too.
A heatsink with a large number of fins is good, but you'll also need a fan to circulate the air. A heatsink can only radiate so much heat when the surrounding air is already hot. You need a fan to circulate air through the fins.
The Vantec cooler has two 50 x 50 x 10mm ball bearing fans. These 5200RPM bad boys can move 12.5 cubic feet of air per minute (CFM).