Scythe Ninja 2: Tweaking a Classic

Cooling
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TEST RESULTS

Cooling Results

Scythe Ninja 2 w/ reference Nexus 120mm fan
Fan Voltage
SPL @1m
Temp
°C Rise
°C/W
12V
16 dBA
38°C
17
0.22
9V
13 dBA
39°C
18
0.23
7V
12 dBA
41°C
20
0.26
5V
11 dBA
44°C
23
0.29
Load Temp: CPUBurn for ~10 mins.
°C Rise: Temperature rise above ambient (21°C) at load.
°C/W: based on the amount of heat dissipated by the CPU (measured 78W); lower is better.

The Ninja 2 performed very well during testing. Thermal rise was only 17°C above ambient at 12V and 23°C at 5V, which is not a lot of difference considering at 5V, the Nexus fan spins at just above 500 RPM. Despite the decrease in fin spacing, the Ninja 2 is excellent when airflow is limited and makes a good choice as a passive CPU cooler. The Nexus fan is usually inaudible at 9V or less unless the ambient noise level is very low as it is in our anechoic chamber.

Comparison: Ninja 2 vs. Previous Ninjas
Fan Voltage
SPL @1m
°C Rise Above Ambient Temperature
Original
Ninja 2
Copper
Rev.B (bolt-thru)
Rev. B
12V
16 dBA
15
17
17
21
25
9V
13 dBA
16
18
18
22
27
7V
12 dBA
19
20
20
24
30
5V
11 dBA
21
23
23
26
32
All results generated with our reference Nexus 120mm fan.

While the Ninja 2 did not improve on our original, enigmatic Ninja sample, it did match the Copper's performance despite its mostly aluminum composition. It is much superior to the Ninja Rev. B, even when a bolt-thru kit is used with the latter.

Comparables
Fan Voltage
SPL @1m
°C Rise Above Ambient Temperature
HDT-S1283
Zen FZ120
Ninja 2
Ninja Copper
Hyper Z600
12V
16 dBA
13
15
17
17
17
9V
13 dBA
15
16
18
18
19
7V
12 dBA
18
19
20
20
21
5V
11 dBA
24
24
23
23
25
All results generated with our reference Nexus 120mm fan.

The Ninja 2 posted test results identical to the Ninja Copper. While it does not perform better overall than some of the newer, smaller heatsinks like the Xigmatek HDT-S1283 and Zerotherm Zen, it holds an impressive advantage when very low airflow is applied. For example, the HDT-S1283 is 6°C worse at 5V compared to 7V, while Ninja 2 is only 3°C worse. We postulate that if airflow is decreased further, the Ninja 2's performance advantage would increase.



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