Scythe Rasetsu CPU Cooler Review - Installation and Testing


Installing the Scythe Rasetsu is the same as many of Scythe's other coolers, which involves locating the appropriate provide mounting hardware, and then "snapping" it into the slots in the base of the cooler.  For example, here is the mounting hardware from the Yasya (the bases of these two coolers, as well as the mounting hardware, are actually exactly the same), and how the hardware "snaps" into the base itself.


Rasetsu mounts quickly and easily via pushpins for Intel, or a clamp-down system for mounting on AMD boards.  I personally like the security of having a bolt-through mounting system, and for those who think push-pins are a deal-breaker, take a look at This Guide on how to cheaply and easily bolt-through mount your Rasetsu cooler!

Installation was mostly a breeze, but if you are using a smaller board like mine, things can be a bit cramped, and since this cooler isn't as tall as many coolers, it compensates by being a bit wider.  It fits fine over the top of my RAM, but you may have a bit of lateral clearance issues, so plan out and measure accordingly, but you shouldn't have any trouble with this fitting.  The only "issue" is that I had to remove one of the RAM sticks in order to fit my hand in to lock down the push-pin, but that didn't hold me up but for about 10 seconds, and is a mild inconvenience.


This cooler is relatively light, and didn't seem to put much torque or pressure on the motherboard itself, which is a nice break when using a high performance cooler, as many higher-end coolers now are getting so large and heavy that motherboards everywhere are beginning to cower in fear.  As you can see it has healthy clearance over other board components, so the width of the cooler shouldn't be an issue.

Idle Testing

For idle testing, we booted up the system, allowed the CPU to stabilized at below 2% usage, and then tested for 10 minutes, and we used RealTemp to record the CPU temperatures.

Zalman CNPS 9700                                                                         Scythe Rasetsu


From these results, we can clearly begin to see a dominance of Scythe's Rasetsu over the Zalman 9700, with a 5°C temperature reduction!  This is no small amount, and we are expecting big advantages during load testing as well!

Load Testing

For our load tests, we used Prime95 to stress the CPU to 100%, and let it run that way for one hour, and then use RealTemp to record the temperatures

Zalman CNPS 9700                                                                         Scythe Rasetsu


The Rasetsu cooler really shines by further outperforming the Zalman cooler during our load tests, with advantages of 7-10°C!  These are very substantial advantages which really pay huge dividends in thermal stability of heavily overclocked processors, and we expect far greater overclocking abilities with the Rasetsu cooler over our Zalman test cooler.

Another performance note to keep in mind, I run the tests out of an open-sided case to help isolate the CPU cooler itself, and I could imagine to have even better results had my side-mounted fan been able to further assist the airflow over the cooler, as it resides directly over the cooler itself.


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