Scythe Rasetsu Top Flow CPU Cooler

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scythe rasetsuThis new technology is Scythe’s way of allowing for more surface area via the trident–like fin design, to allow for fresh air to blow across without as much effort. What separates the new Rasetsu from it's sibling the Yasya is the fact of it not being a tower style like the Yasya, but a top flow type cooler, or "table-top" as I like to call it. Besides the family resemblance, which is the better cooler? That is precisely what we will find out.

Introduction to Scythe Rasetsu Top Flow CPU Cooler

If you think the next heat sink up for review looks familiar to you then you must be an avid vistor to the pages of Pro-Clockers. The new Rasetsu from Scythe does share a heavy resemblance to the Yasya, which we reviewed some time ago. As to what makes them look so similar is to their utilization of the Trident Multi Layer Fin technology, or T.M.L.F. for short.

This new technology is Scythe’s way of allowing for more surface area via the trident–like fin design, to allow for fresh air to blow across without as much effort. What separates the new Rasetsu from it's sibling the Yasya is the fact of it not being a tower style like the Yasya, but a top flow type cooler, or "table-top" as I like to call it. Besides the family resemblance, which is the better cooler? That is precisely what we will find out.

Scythe’s take on the Rasetsu

Rasetsu combines the outstanding design of the Yasya CPU Cooler with a top-flow layout. The newly developed T.M.L.F.(Trident Multi Layer Fin) structure provides a higher intake volume, thus enabling a more efficient use of the unparalleled Six Heatpipe Construction. Equipped with new "Slip Stream 120 PWM Adjustable" fan, user can manually adjust the bandwidth between 470 to 1,370 rpm and 740 to 1,900 rpm. Rasetsu using the VTMS-Versatile Tool-Free Multiplatform System for quick and safe mounting.


Specifications

Model Name:

RASETSU

Model #:

SCRT-1000

Manufacturer:

Scythe Co., Ltd. Japan

 

 

Heatsink

Dimension:

130 x 141 x 130 mm

 

 

5.12 x 5.55 x 5.12 inch

 

Weight:

730 g (Including Fan)

 

 

25.74 oz (Including Fan)

 

 

 

Fan

Dimension:

120 x 120 x 25 mm

 

 

Scythe Slip Stream PWM Adjustable

 

Speed: Maximum Band

740(±25%) ~ 1,900 rpm (±25%)rpm

 

Speed: Minimum Band

470(±30%) ~ 1,340 rpm (±10%)rpm

 

Noise Level:Maximum Band

9.8 - 37.0 dBA

 

Noise Level:Minimum Band

7.05 - 27.3 dBA

 

Air Flow : Maximum Band

37.15 - 110.31 CFM

 

Air Flow : Minimum Band

23.0 - 76.53 CFM

 

Bearing:

Sleeve Bearing

Features

V.T.M.S. (Versatile Tool-Free Multiplatform System)
Improved Version of VTMS allows multiplatform installation without any tools.

Twist Intersected pipe Structure
Twisted intersected 6 heatpipes achieved high heat transfer structure concentrated onto topflow heatsink layout.

Trident Multi Layer Fin Structure
By placing the number of triangle shaped main & supplemental heatsink fins to maximize the air intake volume, heat absorb rate from the built-in heatpipes is ideal for extreme over-clocking purposes as well as to cool the high-end multi-core CPU.

Slip Stream120 PWM Adjustable
Equipped with Scythe original Slip Stream 120PWM Adjustable fan, it allows a user to choose the fully automatic PWM feature fan speed control or alternatively adjust the PWM band range to fulfill demands from silent to high performance users.


Closer look

Out of the box you can see that the Rasetsu looks very different from most other coolers on the market, even though the structured concept is very common. What makes the Rasetsu different from the others are the sharp angular cuts in the fins. As stated in the introduction this gives the cooler more surface area, which leads to more efficient cooling. The first cooler to use this way of doing things was the Scythe Yasya cooler.

The Rasetsu comes packaged with the fan already assembled but we removed it to give you a better top-view of the cooler. If you look at the Rasetsu and Yasya you can see that the similarities basically stop with the fins since the Rasetsu's airflow is of the top to bottom design.

The cooler consist of fifty-seven aluminum fins and are supported by six copper heat pipes, measuring 0.6mm in diameter. Scythe likes to call their use of heat pipes ‘Twist Intersected pipe Structure’ which makes the pipes longer to allow for better heat transfer. Which from the side view you see where most of the twists are in the heat pipes.

The base on any of the Scythe coolers I have ever tested have never been anything but shiny. Maybe this one of the features that allows Scythe to have produced some of the most remarkable air-coolers we have ever seen.

Packaged with the Rasetsu is a 120mm Slip Stream fan, along with a rear slot fan controller. The fan has two different setting which are Min and Max allowing for two different sets of performance characteristics (or bands as they are calling it). The information below was taken from Scythe’s website:

 

Speed: Maximum Band

740(±25%) ~ 1,900 rpm (±25%)rpm

 

Speed: Minimum Band

470(±30%) ~ 1,340 rpm (±10%)rpm

 

Noise Level:Maximum Band

9.8 - 37.0 dBA

 

Noise Level:Minimum Band

7.05 - 27.3 dBA

 

Air Flow : Maximum Band

37.15 - 110.31 CFM

 

Air Flow : Minimum Band

23.0 - 76.53 CFM


Installation
There is little to talk about when it comes to the installation of the Rasetsu cooler. It uses Scythe’s Versatile Tool-Free Multiplatform System or VTMS feature. Basically no screwing of brackets onto the base of the cooler like most require nowadays. The needed mounting brackets just snap into the base of the cooler and is then placed onto the motherboard.


Testing and results

Test Hardware:
Motherboard: ASUS P7P55D-E Deluxe
Processor: Intel Core i5 655K @ 4.2GHz at 1.4 volts
Ram: OCZ DDR3 1600 4GB Dual Channel
Video Card: Sapphire HD 5750
HDD: Hitachi 1TB
Power: Thermaltake Tough Power XT 850 (Sponsored by Thermaltake)
Case: NA
Cooling: Scythe Rasetsu
OS: Microsoft Windows 7 64-bit
Thermal compound: Arctic Silver 5

Competition:
Scythe Yasya

Testing of the Scythe Rasetsu

Over time, we've found that we have been able to get a better overclock out of our i5 655K (4.2GHz) with a very respectable 1.4v, so we used this for testing the Rasetsu. To do so we allow the system to sit idle for one hour and then measured the temperature. Afterward, we load OCCT and run a 30 minute bench session with priority set to high, then recorded the temps at the end. Each core was recorded for more detailed performance information. 

Results

In the testing we saw the Rasetsu out perform the older Yasya by just a degree or two max. Besides the cooling numbers we also realized that both had their own advantages over the other. The Rasetsu because of the way the fan is positioned cools down the surface of the motherboard and surrounding components; however, that also means that the heat stays in the case, since the Yasya blows air out the rear of the case where the Rasetsu does not. And lastly, the Rasetsu can fit in the some cases where the Yasya can’t not due to its height.


Conclusion

Scythe knows that you have plenty of options out there when it comes to air-cooling. Many of those options are made by them for that matter. What Scythe has brought to the table, which started a few coolers ago, was the mounting option they call Versatile Tool-Free Multiplatform System . What that means is no tools needed to install the mounting hardware required to affix the heatsink to the motherboard. They followed that technological move up with the new Trident Multi Layer Fin technology. This all shows that Scythe is trying to make a difference in air-cooling and not trying to flood the market with as many coolers as possible without advancing the technology any behind them.

The Rasetsu is one fine cooler that offers all the technological goodness needed to improve on the whole. With its high performing numbers it can even be installed in cases where many tower-style coolers cannot go due to clearance issues.  Meaning that you can now have a great cooler in a HTPC build and not having to rely on the stock CPU box cooler as many of us have had to do in the past.

We know looks aren’t everything but the Rasetsu is one of the nicest looking coolers we have seen in some time. This coupled with the ease to install and nice performance, makes it a highly recommended item.

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