Scythe Top-Down Coolers: Kabuto vs. Zipang 2

Cooling
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TESTING

Before thermal testing, we took some basic physical measurements.

Scythe Kabuto & Zipang 2:
Approximate Physical Measurements
Property Kabuto Zipang 2
Weight
600 g
730 g with fan and clips
750 g with fan, clips and mounting hardware
590 g
730 g with fan and clips
750 g with fan, clips and mounting hardware
# of fins
53 68
Fin thickness
0.31 mm 0.31 mm
Fin spacing
1.94 mm 1.94 mm
Approx. area of main fin stack
6042 cm2 6568 cm2
Vertical Clearance
60 mm (motherboard PCB to heatsink's bottom fin) 44 mm (motherboard PCB to heatsink's bottom fin)

Comparison: Approximate Fin Thickness & Spacing
Heatsink
Fin Thickness
Fin Spacing
Scythe Ninja 2
0.39 mm
3.68 mm
Thermalright HR-01 Plus
0.45 mm
3.15 mm
Noctua NH-U12P
0.44 mm
2.63 mm
Noctua NH-C12P
0.47 mm
2.54 mm
Thermolab Baram
0.44 mm
2.52 mm
Prolimatech Megahalems
0.50 mm
2.00 mm
Xigmatek HDT-S1283
0.33 mm
1.96 mm
Scythe Zipang 2
0.31 mm
1.94 mm
Scythe Kabuto
0.31 mm
1.94 mm
Scythe Mugen-2
0.31 mm
1.89 mm
Zerotherm Zen FZ120
0.37 mm
1.80 mm
Zalman CNPS10X Extreme
0.42 mm
1.50 mm
Thermalright Ultra-120
0.45 mm
1.42 mm

Testing was done according to our unique heatsink testing methodology, and the included fan was profiled using our standard fan testing methodology. A quick summary of the components, tools, and procedures follows below.

Key Components in Heatsink Test Platform

  • Intel Pentium D 950 Presler core, C1 stepping. TDP of 95W; under our test load, it measures 78W including losses in the VRMs.
  • Asus P5Q-EM motherboard. A microATX board with integrated graphics and short solid-state capacitors around the CPU socket, and a diminutive northbridge heatsink for maximum compatibility.
  • Intel X25-M 80GB 2.5" solid-state drive.
  • 1GB of Corsair XMS2 DDR2 memory. 2 x 512MB PC2-8500.
  • FSP Zen 300W fanless power supply.
  • Arctic Silver Lumière: Special fast-curing thermal interface material, designed specifically for test labs.
  • Nexus 120 fan (part of our standard testing methodology; used when possible with heatsinks that fit 120x25mm fans)
Nexus 120mm fan measurements
Voltage
Noise
RPM
12V
16 dBA@1m
1100 RPM
9V
13 dBA@1m
890 RPM
7V
12 dBA@1m
720 RPM
5V
11 dBA@1m
530 RPM

Measurement and Analysis Tools

  • Seasonic Power Angel for measuring AC power at the wall to ensure that the heat output remains consistent.
  • 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 sensor. This sensor is not calibrated, so results are not universally applicable.
  • CPUBurn P6, used to stress the CPU heavily, generating more heat than most real applications. Two instances are used to ensure that both cores are stressed.
  • Throttlewatch 2.01, used to monitor the throttling feature of the CPU to determine when overheating occurs.

Load testing was accomplished using CPUBurn to stress the processor, and the graph function in SpeedFan was used to make sure that the load temperature was stable for at least ten minutes. The stock fan was tested at various voltages to represent a good cross-section of its airflow and noise performance.



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