![]() ![]() Some older Big Box computers (dell?) had a rear case fan that was ducted to the CPU heatsink, the heatsink itself had no fan, the rear fan pulled all the case air through the heatsink before spiting it out the back. When you see fan blades with wildly different profiles at the hub and the blade tips what you are looking at is the engineers attempting to get more of the air to flow though the middle of the fan instead of just at the tips. Even a 1" spacer helps balance out the flow a lot. Ideally you would have more like 6" between the fan and the HSF, but that just isn't practical. That pressure then forces the air through the HSF where ever it can, which is the entire surface rather then just that 1" band. As a result, the vast majority of the air goes into a 1" band around the outside of the HSF where the blade tips are.Ī sealed chamber between the fan and the HSF gives the air time to collect itself and form a more balanced flow, it takes the high velocity air from the blade tips and slows it down, resulting in pressure instead. If you hold a fan in your hand and feel where the air is going, the majority leaves the casing at a 45* angle out from the outer edges of the fan, none from the very middle, and very little from the point between the hub and the blade tips, also almost no air is actually headed straight forward. It has better reviews then the previous one.Ī spinning fan pushes (pulls, really, but that's a different story) air away from the hub, partly forward and partly out towards the rim. The 212+ came out quite recently (comes with i5 brackets) and is a more classic tower cooler with HDT and full width aluminum fins and a newer type fan. The 212 came out in 07 and was an ok cooler, but the two tower thing is really just them cheaping out on the aluminum, it hurts performance. Don't confuse the 212 with the 212+, they're different. ![]()
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