Scythe Mugen 4 CPU Cooler: Scythe Strikes Back

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The Scythe Mugen 4 is composed of 50 aluminum fins friction-fit to six 6 mm thick copper heatpipes which in turn are soldered to a nickel-plated copper base. According to our measurements, the heatsinks' dimensions are 13.0 x 8.8 x 15.6 cm (W x D x H) and the weight is 630 grams (750 grams including the fan).

The Mugen 4 has a noticeably different structure than the Mugen-2 we reviewed four years ago. The heatsink is separated into four columns rather than five and the space between them is greater. The fins also overlap into adjacent columns at staggered intervals, so there isn't a large uniform gap between the fin-stacks.

We never reviewed the third iteration but from what we've read it's very similar except it used the flawed mounting system of its predecessor.

Scythe also managed to pack in an additional sixth heatpipe into the design. The pipes are heavily curved compared to the Mugen-2. The gaps between the heatpipes and the baseplate are noticeably filled with solder.

Measuring 88 mm from front to back, the Mugen 4 is quite thick for a single tower heatsink. It's actually slimmer than the Mugen-2 by 12 mm but it's still a dense body for the fan to blow through. The fins are 0.30 mm thick and spaced 1.82 mm apart on average.

The base of the Mugen 4 is a departure from previous Scythe models. The surface is slightly convex and the finish is a bit rougher. Gone is the almost mirror polish of the Mugen-2.

The stock fan is a Glide Stream 120, which has a similar design to the famous Slip Stream 120 we've come to love. Scythe claims that the new distinctive grooves chiseled into the blades on the intake side reduces air resistance. In retail, the Glide Streams also have rubber inlays fitted into the corners to minimize vibration; our sample lacked this feature.

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