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Rasetsu (SCRT-1000)

The Rasetsu (SCRT-1000) could only be spotted on the manufacturer’s Japanese website so far, but it is not going to be limited to Japan. The cardboard package this made-in-Taiwan cooler comes in is smaller than the Ninja 3 box but carries a lot of information on itself, too.


Two pairs of fasteners, wire clips for a fan, an installation guide and Scythe thermal grease are included with the cooler.

The Scythe Rasetsu comes at a recommended price of $55 with a 2-year manufacturer’s warranty.

The first thing that strikes one after the massive Ninja 3 is how light the Rasetsu is. The fan included, the cooler weighs only 730 grams or two thirds of the Ninja 3’s weight. Well, top-design coolers like the Rasetsu have always been smaller and lighter than tower-design ones. Let’s take a look at the new product:


The outline of the Scythe Yasya heatsink can be seen easily. It looks like a Yasya tower put on its side and split into two halves which are hung on six 6mm heat pipes.


The number of aluminum fins is reduced from 54 to 52 (22+30) but they are the same thickness (0.35 mm) and the same distance apart (1.8 mm). The Rasetsu uses the Trident Multi Layer Fin structure, but does not have the mirror polish of the fins as the Yasya.

There are three heat pipes for each heatsink section. They cross each other intricately before entering the heatsink fins.


The heat pipes are not vertical but slanting in the aluminum fins which must be the consequence of technological process rather than some new feature devised by Scythe engineers. An auxiliary aluminum heatsink (64x40 mm) is installed above the heat pipes. It serves as the support for the cooler’s fasteners.

The cooler’s nickel-plated copper sole measures 47 x 50 millimeters and is 2 millimeters thick. It is finished well but not to a mirror shine.

It is ideally flat, though.

The Rasetsu can be installed without taking the mainboard out of the system case and without using any tools. Featuring the Versatile Tool-Free Multiplatform System, it can be mounted easily on the CPU. First, you insert the fasteners into the cooler’s bottom heatsink. 


For Intel CPUs

Then you just lock them on the mainboard.


The distance from the cooler’s sole to the bottom edge of the aluminum fins is 43 millimeters, so it is easy to take the cooler off by turning the plastic locks. It is unlikely to conflict with tall mainboard components.

The user manual does not tell anything about the proper orientation of the Rasetsu on the CPU although the ends of the three heat pipes are directed downward in one installation variant. Sometimes such nuances may affect a cooler’s performance. We checked out two positions:


As we found out, the Rasetsu is 4°C more effective when the heat pipes are oriented horizontally (the right photo) rather than otherwise (the left photo) although the convex CPU cap may have influenced the results. Anyway, we installed the cooler so that its heat pipes were horizontal for our tests.

Installing a 140mm fan on the Rasetsu doesn’t improve its performance.

At the same speed as the default 120mm fan, the 140mm fan cools the CPU just as effectively. By the way, the Rasetsu comes with the same fan as the Ninja 3. It is a Slip Stream 120 Adjustable PWM (SY1225SL12HPVC).

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