Surging is what happens to a compressor or fan if you restrict the outlet too much. In fact, throttling the suction is a safe and practical way to reduce the flow of gas through a compressor or fan, but it is a complete no-no with liquids. Cavitation by definition cannot happen when moving gases like air. This can cause tiny bubbles to form and collapse on the blades of the impeller, causing pitting and erosion. It occurs when the suction pressure is too low and the liquid gets below its vapour pressure. More details: Cavitation applies to centrifugal pumps moving liquid. My guess is Cooler Master increased the fin density on the 212+, and swapped to a fan with a blade pitch that's more efficient at higher pressure, because they discovered that that combination increases the total cooling capacity of the heatsink/fan combination. The 212+ is the successor to the 212 Evo. In other words, you're just looking at the fan specs, but it's the fan/heatsink combination that matters. A dense heatsink would benefit more from a fan that can generate more pressure, rather than one that can push more air into open space. Which one to choose depends on the heatsink and the restriction it creates. ![]() The 212 Evo is the opposite, it can flow more air into open space, but can't generate as much pressure and therefore can't flow as much air into a dense heatsink. ![]() The 212+ can generate more pressure and push more air into a restrictive load (dense heatsink), but it can't flow as much air into the open. Think of the open-circuit-voltage/short-circuit-current specs for a solar panel. You're reading those specs as an AND, when it really should be more of an OR.
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