The Mugen 4 is the first truly elite Scythe heatsink we’ve tested in many years. An updated mounting system and an acoustically sound fan help gives it an edge against some its bigger, more expensive rivals.
August 27, 2013 by Lawrence Lee
Product | Scythe Mugen 4 (SCMG-4000) CPU Cooler |
Manufacturer | Scythe |
Street Price | £35~£40 |
As some of you know, Scythe was one of the pioneers of aftermarket CPU cooling.
They helped popularize the now ubiquitous tower design adopted by the best air-cooled
heatsinks currently on store shelves. The original Scythe Ninja belongs in the
DIY hall of fame, a landmark cooler at the start of the tower era. But today,
someone looking for a high-end cooling solution is, more often than not, turning
to products made by companies like Prolimatech, Noctua, and Thermalright. In
this space, Scythe has become sort of a second class citizen.
That’s not to say they haven’t produced anything worthwhile in the past five
or six years. On the contrary, they’ve made some nice tower coolers, good GPU
coolers as well as some exceptional smaller CPU heatsinks like the Ninja Mini
and the Shuriken series. They just haven’t participated in the race to the top
that their competitors have been engaged in, with each new model getting progressively
bigger. The last notable big cooler Scythe we reviewed was the Mugen-2, which
won our coveted Editor’s Choice award in 2009 for delivering mid-to-high performance
at a relatively attractive price.
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We never got our hands on the Mugen 3, but the Mugen 4 is now here for our
appraisal, and it looks like an offering that might bring Scythe back into contention
as far as big heatsinks are concerned. The Mugen-2 had a very boxy appearance
while the Mugen 4 is sleeker and slightly slimmer. The structure has been revamped
to be less uniform with the heatpipes and fins taking on a more staggered approach.
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A bigger difference might be the mounting system. The Mugen-2 was one of the
first Scythe coolers to feature a bolt-thru mechanism but installation was finished
on the back side of the motherboard which is usually an awkward
procedure. The newest Mugen uses a more modern and familiar scheme, similar
to those adopted by the big boys, the aforementioned Prolimatech, Noctua, and
Thermalright. If you’re going to copy someone, copy the best.
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Included with the heatsink is a brief assembly guide, mounting gear, two sets
of fan clips, and a 120 mm fan. The fan is a Glide Stream 120, the successor
to one of favorite fan lines, the Slip Stream 120. Depending on how well the
Mugen 4 performs, the fan might be what puts it over the top. Aside from Noctua
and Phanteks, Scythe is the only major heatsink manufacturer to consistently
mate their coolers with excellent sounding stock fans.
Scythe Mugen 4 (SCMG-4000): Specifications (from the product web page) | |
Compatibility | Intel®: Socket LGA775, Socket LGA1150, Socket LGA1155, Socket LGA1156, Socket LGA1366, Socket LGA2011 (Square ILM) / AMD®: Socket AM2, Socket AM2+, Socket AM3, Socket AM3+, Socket FM1, Socket FM2 |
Overall Dimensions | 130 x 88 x 156.45 mm / 5.11 x 3.46 x 6.14 (excl. fan) |
Weight | 625 g / 22.04 oz (Heatsink only) |
Fan Model Name | Glide Stream 120 PWM |
Fan Model Number | SY1225HB12SM-P |
Fan Dimension | 120 x 120 x 25 mm / 4.72 x 4.72 x 0.98 in |
Noise Level | 5.3 ~ 28 dBA |
Air Flow | 20.7 ~ 79 CFM / 35.16 ~ 134.2 m³/h |
Fan Speed | 400 (±200 rpm) ~ 1,400 rpm (±10%) (PWM-controlled) |
Static Pressure | 1.18 ~ 15.3 Pa / 0.12 ~ 1.56 mmH2O |
Fan Bearing Type | Sleeve Bearing |
Scope of Delivery | 2 x mounting plate (Intel), 2 x mounting plate (AMD), 1 x mounting bar, 4 x screw for mounting plates, 8 x stud nuts, 2 x mounting screws, 1 x spacer (socket 775), 4 x spacers, 1 x wrench, 4 x fan clips (2 sets), back plate, thermal grease, installation manual |
PHYSICAL DETAILS
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).
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. |
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BASE & INSTALLATION
The most critical aspect of installation is that the heatsink be securely
mounted. A firm mating results in good contact between the heatsink’s base and
the CPU heatspreader and more efficient heat conduction. Ideally it should
also be a simple procedure with the user having to handle as few pieces of
hardware as possible.
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TESTING
Before thermal testing, we took some basic physical measurements.
Approximate Physical Measurements | |
Weight | 630 g (+120 g with stock fan) |
Height | 156 mm |
Fin count | 50 |
Fin thickness | 0.30 mm |
Fin spacing | 1.82 mm |
Vertical Clearance* | 38 mm |
* measured from motherboard PCB to bottom fin of heatsink |
Large Heatsink Comparison: Average Fin Thickness & Spacing | ||
Heatsink | Fin Thickness | Fin Spacing |
SilverStone Heligon HE02 | 0.52 mm | 3.30 mm |
Thermalright HR-01 Plus | 0.45 mm | 3.15 mm |
Thermalright HR-02 Macho | 0.34 mm | 3.12 mm |
Scythe Ninja 3 | 0.39 mm | 2.64 mm |
Noctua NH-U12P | 0.44 mm | 2.63 mm |
Noctua NH-C12P | 0.47 mm | 2.54 mm |
Noctua NH-D14 | 0.43 mm | 2.33 mm |
Thermalright Archon SB-E | 0.49 mm | 2.33 mm |
GELID Tranquillo Rev.2 | 0.40 mm | 2.30 mm |
Phanteks PH-TC12DX | 0.39 mm | 2.30 mm |
GELID GX-7 Rev.2 | 0.31 mm | 2.25 mm |
Phanteks PH-TC14PE | 0.40 mm | 2.21 mm |
be quiet! Dark Rock 2 | 0.38 mm | 2.22 mm |
Prolimatech Armageddon | 0.51 mm | 2.08 mm |
Prolimatech Megahalems | 0.50 mm | 2.00 mm |
Zalman CNPS10X Quiet | 0.40 mm | 2.00 mm |
Scythe Kabuto & Zipang 2 | 0.34 mm | 1.94 mm |
NZXT Havik 140 | 0.41 mm | 1.91 mm |
Scythe Mugen-2 | 0.31 mm | 1.89 mm |
Swiftech Polaris 120 | 0.43 mm | 1.85 mm |
SilverStone Argon AR01 | 0.30 mm | 1.85 mm |
Thermalright Venomous X | 0.53 mm | 1.84 mm |
Scythe Mugen 4 | 0.30 mm | 1.82 mm |
Noctua NH-C14 | 0.38 mm | 1.79 mm |
Enermax ETS-T40 | 0.40 mm | 1.79 mm |
Scythe Yasya | 0.32 mm | 1.78 mm |
SilverStone Argon AR03 | 0.42 mm | 1.72 mm |
Cogage TRUE Spirit 1366 | 0.40 mm | 1.70 mm |
Arctic Cooling Freezer Xtreme Rev.2 | 0.30 mm | 1.70 mm |
Scythe Grand Kama Cross | 0.38 mm | 1.66 mm |
Reeven Kelveros | 0.47 mm | 1.61 mm |
Zalman CNPS9900 MAX | 0.16 mm | 1.59 mm |
Thermalright Silver Arrow | 0.32 mm | 1.57 mm |
Cooler Master Hyper 212 Plus | 0.43 mm | 1.54 mm |
Thermalright Ultra-120 eXtreme Rev.C | 0.56 mm | 1.52 mm |
Zalman CNPS10X Extreme | 0.42 mm | 1.50 mm |
Testing on larger heatsinks are done on our
LGA1366 heatsink testing platform, while smaller coolers tackle our LGA1155 heatsink testing platform. A summary of the test system
and procedure follows.
Key Components in LGA1366 Heatsink Test Platform:
- Intel Core i7-965 Extreme
Nehalem core, LGA1366, 3.2GHz, 45nm, 130W TDP. - Asus
P6X58D Premium ATX motherboard. X58 chipset. - Asus
EAH3450 Silent graphics card. - Intel
X25-M 80GB 2.5″ solid-state drive. Chosen for silence. - 3GB QiMonda
DDR3 memory. 3 x 1GB DDR3-1066 in triple channel. - Seasonic X-650 SS-650KM
650W ATX power supply. This PSU is semi-passively cooled. At the power levels
of our test platform, its fan does not spin. - Arctic Silver
Lumière: Special fast-curing thermal interface material, designed
specifically for test labs. - Noctua 140 mm fan (used when possible with heatsinks that fit 140x25mm
fans) - Nexus 120 mm fan (used when possible with heatsinks that fit 120x25mm
fans) - Nexus 92 mm fan (used when possible with heatsinks that fit 92x25mm
fans)
The systems are silent under the test conditions, except for the CPU cooling
fan(s).
Normally, our reference fans are used whenever possible, the measured details
of which are shown below.
Reference Noctua 140mm fan Anechoic chamber measurements | ||
Voltage | Speed | SPL@1m |
12V | 1250 RPM | 28~29 dBA |
9V | 990 RPM | 21 dBA |
8V | 880 RPM | 18 dBA |
7V | 770 RPM | 15~16 dBA |
6V | 660 RPM | 13 dBA |
Reference Nexus 120 mm fan Anechoic chamber measurements | ||
Voltage | Speed | SPL@1m |
12V | 1080 RPM | 16 dBA |
9V | 880 RPM | 13 dBA |
7V | 720 RPM | 12 dBA |
Reference Nexus 92 mm fan Anechoic chamber measurements | ||
Voltage | Speed | SPL@1m |
12V | 1470 RPM | 17 dBA |
9V | 1280 RPM | 14 dBA |
7V | 1010 RPM | 12 dBA |
Measurement and Analysis Tools
- Extech 380803 AC power analyzer / data logger for measuring AC system
power. - Custom-built, four-channel variable DC power supply, used to regulate
the fan speed during the test. - PC-based spectrum analyzer:
SpectraPlus with ACO Pacific mic and M-Audio digital
audio interfaces. - Anechoic chamber
with ambient level of 11 dBA or lower - Various other tools for testing fans, as documented in our
standard fan testing methodology. - SpeedFan,
used to monitor the on-chip thermal sensors. The sensors are not calibrated,
so results are not universally applicable. The hottest core reading is used. - Prime95,
used to stress the CPU heavily, generating more heat than most real applications.
All instances are used to ensure full stress. - CPU-Z,used to monitor the CPU speed to determine when overheating occurs.
- Thermometers to measure the air temperature around the test platform
and near the intake of the heatsink fan.
Noise measurements are made with the fans powered from the lab’s variable DC
power supply while the rest of the system was off to ensure that system noise
did not skew the measurements.
Load testing was accomplished using Prime95 to stress the processor, and the
graph function in SpeedFan was used to ensure that the load temperature is stable
for at least ten minutes. The temperature recorded is the highest single core
reading. The stock fans were tested at various voltages to represent a good
cross-section of airflow and noise performance.
The ambient conditions during testing were 10~11 dBA and 21~23°C.
STOCK FAN MEASUREMENTS
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Specifications: Scythe Mugen 4 Stock Fan | |||
Manufacturer | Scythe | Power Rating | 2.16 W |
Model Number | SY1225HB12SM-P | Airflow Rating | 20.7 ~ 79 CFM |
Bearing Type | Sleeve | Speed Rating | 400 (±200 rpm) ~ 1,400 rpm (±10%) (PWM-controlled) |
Frame Size | 120 x 120 x 25 mm | Noise Rating | 5.3 ~ 28 dBA |
Hub Size | 36 mm | Header Type | 4-pin PWM |
Blade Diameter | 113 mm | Starting Voltage | 3.0 ~ 3.5 V |
Cable Length | 30 cm | Weight | 120 g |
Corner Type | Open | Retail Availability | No |
The Scythe Glide Stream 120 series is available in 3-pin and 4-pin varieties of varying speeds from 600 up to 2,000 RPM. The Mugen 4’s stock fan is a 1,400 RPM PWM version not sold in stores. With a small hub and struts curved in the opposite direction of the blades, the fan’s structure is similar to the acclaimed Slip Stream line. The shape of the blades has been altered somewhat though. The tips of the leading edges are concave rather than convex, as if someone had taken a bite out of them.
Stock Fan Measurements | ||
Voltage | Speed | SPL@1m |
12V | 1420 RPM | 29 dBA |
9V | 1130 RPM | 23 dBA |
7V | 900 RPM | 16 dBA |
6V | 760 RPM | 13 dBA |
5V | 610 RPM | 11 dBA |
Measuring mic positioned 1m at diagonal angle from center of heatsink. Ambient level: 10 dBA. |
The range of the fan is versatile. While fairly loud (29 dBA@1m) at full speed,
it undervolts well, becoming quiet between 9V and 7V, or at approximately 1,000
RPM. At 6V / 760 RPM, it’s almost inaudible, at 5V / 610 RPM it’s practically
silent. The fan is capable of even lower speeds, even on voltage control, as
the starting voltage is somewhere in the 3.0 to 3.5 V range.
This is the screen capture of Fan Xpert 2’s auto-analysis of the Mugen 4 stock fan on voltage control. |
This is the screen capture of Fan Xpert 2’s auto-analysis of the Mugen 4 stock fan on PWM control. |
Both on voltage and PWM control, the fan can be dialed down to about 400 RPM according to ASUS Fan Xpert 2 utility. This is perfectly in line with Scythe’s specifications.
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Despite the minor differences compared to the Slip Stream, the Glide Stream
fan has a very similar sound. The noise character is exceedingly smooth with
a distinct lack of tonality. It has a tendency to whine at higher speeds typical
of almost all sleeve bearing fans and it’s not particularly unpleasant. There
is also some faint clicking at lower speeds but it’s only audible at very close
proximity.
TEST RESULTS
Test Results: Scythe Mugen 4 | ||||
Fan Voltage | Single Fan | Dual Fan | ||
SPL@1m | Thermal Rise | SPL@1m | ||
12V | 29 dBA | 36°C | N / A | |
9V | 23 dBA | 38°C | ||
7V | 16 dBA | 40°C | ||
6V | 13 dBA | 42°C | ||
5V | 11 dBA | 45°C | ||
Reference 120 mm Fan | ||||
12V | 18 dBA | 40°C | 37°C | 22 dBA |
9V | 13 dBA | 42°C | 39°C | 16~17 dBA |
7V | 11 dBA | 45°C | 41°C | 12 dBA |
Reference 140 mm Fan | ||||
12V | 29 dBA | 37°C | 36°C | 32 dBA |
9V | 21~22 dBA | 39°C | 38°C | 25~26 dBA |
8V | 18~19 dBA | 41°C | 39°C | 22~23 dBA |
7V | 15 dBA | 42°C | 40°C | 18 dBA |
6V | 12~13 dBA | 45°C | 42°C | 13~14 dBA |
Measuring mic positioned 1m at diagonal angle from the center of the heatsink. Ambient noise level: 10~11 dBA. |
The Mugen 4 turned out to be a strong performer regardless of fan speed, generating
an exceptional thermal rise above ambient of 45°C at 5V and 36°C at
12V. The stock fan performance was on par with our superb Nexus 120 mm reference
fan and a bit better than our Noctua 140 mm reference model.
Given the depth of the heatsink, one would expect that a second fan would be
quite beneficial. In dual fan configuration, we observed a difference of about
3°C with our 120 mm reference fan and approximately 2°C with our larger
140 mm reference fan. Given the additional noise produced it does not seem worth
the effort, but this might be different if you’re overclocking and overvolting
a 130W TDP CPU more than we are on our test platform.
HEATSINK COMPARISON TABLES
°C Rise Comparison: CPU Coolers with Single Stock Fan | ||||||||||
SPL (dBA@1m) | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 |
Thermalright HR-02 Macho | 39 | 40 | 41 | 43 | ||||||
Scythe Mugen 4 | 40 | 42 | 45 | |||||||
Scythe Yasya | 40 | 43 | ||||||||
Cogage TRUE Spirit 1366 | 41 | 43 | 46 | |||||||
Zalman CNPS10X Quiet | 40 | 42 | 47 | |||||||
Cooler Master Hyper 212 Plus | 41 | 44 | 54 | |||||||
Silverstone Argon AR03 | 43 | 48 | ||||||||
Scythe Ninja 3 | 44 | 46 | ||||||||
SilverStone Argon AR01 | 44 | 50 |
Out of the box, the Mugen 4 is the second best single fan cooler we’ve tested, running almost neck and neck with the Thermalright HR-02.
°C Rise Comparison: CPU Coolers with 120 mm Reference Fan | |||
Heatsink | Fan voltage / SPL @1m* | ||
12V (~17 dBA) | 9V (~14 dBA) | 7V (~12 dBA) | |
Scythe Mugen 4 | 37 | 39 | 41 |
Thermalright Ultra-120 eXtreme Rev.C | 38 | 40 | 43 |
Thermalright Venomous X | 38 | 41 | 43 |
Prolimatech Megahalems | 38 | 41 | 44 |
SilverStone Argon AR03 | 38 | 41 | 45 |
Noctua NH-U12P | 39 | 42 | 44 |
Scythe Mugen-2 | 39 | 42 | 45 |
Phanteks PH-TC12DX | 40 | 42 | 45 |
Cogage TRUE Spirit 1366 | 40 | 42 | 45 |
Zalman CNPS10X Quiet | 40 | 43 | 46 |
SilverStone Argon AR01 | 41 | 43 | 46 |
Scythe Yasya | 41 | 43 | 47 |
Thermalright Ultra-120 eXtreme | 40 | 43 | 48 |
Cooler Master Hyper 212 Plus | 41 | 44 | 48 |
*Note: there are minor differences in measured SPL due to the variety of fan orientations and mounting methods offered by the compared coolers. |
Armed with our 120 mm reference fan, the Mugen 4 landed a first place finish, beating out the venerable Thermalright Ultra-120 eXtreme and Venomous X.
°C Rise Comparison: CPU Coolers with 140 mm Reference Fan | |||
Heatsink | Fan voltage / SPL @1m* | ||
9V (~20 dBA) | 7V (~15 dBA) | 6V (~12 dBA) | |
Thermalright Archon SB-E | 37 | 40 | 42 |
Prolimatech Armageddon | 39 | 42 | 45 |
Scythe Mugen 4 | 39 | 42 | 45 |
Thermalright HR-02 Macho | 39 | 43 | 45 |
NZXT Havik 140 | 40 | 43 | 47 |
Noctua NH-C14 (top mounted) | 40 | 44 | 48 |
Noctua NH-C14 | 40 | 44 | 49 |
Thermalright Silver Arrow | 39 | 45 | 49 |
Phanteks PH-TC14PE | 42 | 45 | 48 |
SilverStone Heligon HE02 | 45 | 48 | 50 |
be quiet! Dark Rock 2 | 49 | 51 | 53 |
*Note: there are minor differences in measured SPL due to the variety of fan orientations and mounting methods offered by the compared coolers. |
Moving up to a single 140 mm reference fan, the Mugen tied for second/third with the Prolimatech Armageddon.
°C Rise Comparison: CPU Coolers with Dual 140 mm Reference Fans | |||
Heatsink | Fan Voltage / SPL* | ||
8V (~19 dBA) | 7V (~16 dBA) | 6V (~13 dBA) | |
Prolimatech Genesis | 36 | 37 | 39 |
Thermalright HR-02 Macho | 36 | 37 | 40 |
Noctua NH-C14 | 37 | 39 | 41 |
Thermalright Silver Arrow | 37 | 39 | 41 |
Noctua NH-D14 | 38 | 40 | 42 |
Scythe Mugen 4 | 39 | 40 | 42 |
Phanteks PH-TC14PE | 39 | 41 | 43 |
NZXT Havik 140 | 39 | 40 | 43 |
SilverStone Heligon HE02 | 43 | 44 | 46 |
*Note: there are minor differences in measured SPL due to the variety of fan orientations and mounting methods offered by the compared coolers. |
With dual 140 mm reference fans, the Mugen 4 finally faltered, but considering
the company of mostly dual tower heatsinks, it’s an impressive result. It came
within a degree of the Noctua NH-D14 and Thermalright Silver Arrow. The only
other single fan cooler that excelled in this configuration was the Thermalright
HR-02 Macho.
MP3 SOUND RECORDINGS
These recordings were made with a high
resolution, lab quality, digital recording system inside SPCR’s
own 11 dBA ambient anechoic chamber, then converted to LAME 128kbps
encoded MP3s. We’ve listened long and hard to ensure there is no audible degradation
from the original WAV files to these MP3s. They represent a quick snapshot of
what we heard during the review.
These recordings are intended to give you an idea of how the product sounds
in actual use — one meter is a reasonable typical distance between a computer
or computer component and your ear. The recording contains stretches of ambient
noise that you can use to judge the relative loudness of the subject. Be aware
that very quiet subjects may not be audible — if we couldn’t hear it from
one meter, chances are we couldn’t record it either!
The recording starts with 5 second segments of room ambiance, then the fan
at various levels. For the most realistic results, set the volume so that
the starting ambient level is just barely audible, then don’t change the volume
setting again.
- Scythe Mugen 4 stock fan at 1m
— 5V (11 dBA@1m)
— 6V (13 dBA@1m)
— 7V (16 dBA@1m)
— 9V (23 dBA@1m)
— 12V (29 dBA@1m)
FINAL THOUGHTS
Over the past five years we’ve seen multiple elite coolers from Noctua, Thermalright,
and Prolimatech trading blows for the high performance heatsink crown. Scythe
has for the most part avoided this arms race, focusing on smaller niche products,
even though they were one of the manufacturers that really kick-started the
big tower cooler market. It’s been a long time since one of their heatsinks
truly delivered top tier performance — I’m happy to proclaim that now.
I thought Scythe might be falling in the footsteps of crestfallen old guard
cooling companies like Zalman and Thermaltake, but the latest Mugen is a new
hope. The fourth iteration Mugen is a vital modern update that returns Scythe
to some much needed relevance in this space.
In our lab, heatsinks with convex bases have repeatedly outperformed their
flat or concave base competition, and Scythe has finally followed suit. The
new mounting system is also a much needed improvement, generating more pressure/contact
while also being easier to install than the Mugen-2. It’s not an original design,
but has been proven to be highly effective. These factors rank high among the
reasons for the new Mugen’s exceptional performance. The last bit that ties
everything together is the superbly smooth Glide Stream 120 fan. Many heatsinks
simply don’t ship with a decent sounding stock fan (even premier coolers from
Prolimatech and Thermalright) but with Scythe, you can almost count on it.
The Mugen 4 is currently selling for between £35 and £40. The pricing I’ve quoted is in GBP because Scythe lost its official North American distributor awhile back, thus the bulk of their products are now primarily sold in countries across Europe and Asia. I found a couple of US retailers selling the Mugen 3, so it’s possible they might get the latest version in sometime in the future. Availability is the biggest issue facing the Mugen 4; depending on where you live, it might simply not be an option.
One good alternative is the Thermalright
HR-02 Macho. Another thick, single fan cooler with bare unplated heatpipes
and fins, the HR-02 has a similar price and cooling capabilities. The HR-02
is a more versatile cooler as it benefits more from a second fan, its wider
fin spacing is more conducive to passive cooling, and its asymmetrical design
alleviates any possible RAM interference issues. The Mugen 4’s primary advantage
is its splendid fan which is a big step up from the HR-02’s muddy-sounding TY-140.
The Mugen is also slightly lighter and slimmer. You can’t really go wrong with
either as both are more cost and size effective alternatives to the beastly
£60+ dual fan coolers that currently dominate the top-end of the
market.
Our thanks to Scythe
for the Mugen 4 CPU cooler sample.
Scythe Mugen 4 receives the SPCR Editor’s Choice Award
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SPCR Articles of Related Interest:
SilverStone Argon AR02 CPU Cooler
NoFan CR-95C Copper Fanless CPU Cooler
SilverStone Argon AR01 & AR03 CPU Coolers
Noctua NH-U12S Slim Tower Heatsink
Cooler Master Seidon 240M: Dual Fan Liquid CPU Cooler
Thermalright HR-02 Macho Quiet/Fanless Cooler
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