Prolimatech Panther CPU Cooler

Cooling
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Stock Fan Measurements

Specifications: Prolimatech Panther
Manufacturer
Power Rating
3.6 W
Model Number
RL4R S1202512LNP-4M
Airflow Rating
?
Bearing Type
Sleeve
Speed Rating
800 ~ 1600 RPM
Corners
Open
Noise Rating
?
Frame Size
120 x 120 x 25
Header Type
4-pin
Blade Diameter
112 mm
Starting Voltage
6.2 V
Hub Size
41 mm
Weight
110 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The Panther's stock fan is a 1600 RPM, sleeve bearing model with a sleeved, 25 cm, 4-pin PWM cable. It has a fairly standard design with straight struts and blades curved to a modest degree. One notable characteristic is its large hub which creates a large dead-spot at the center, making it less efficient.


The stock fan running at 7V measured 16~17 dBA@1m.

The stock fan's acoustics were typical for an average sleeve bearing fan. It was generally smooth but also had a buzzy character at high speeds (1100 RPM and up) that devolved into a low-pitched hum at slower speeds. Some bearing chatter was also noticeable but only at close distances, within about half a meter.

Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
1800 RPM
34~35 dBA
9V
1400 RPM
27 dBA
8V
1190 RPM
22 dBA
7V
850 RPM
15 dBA
6.7V
560 RPM
13 dBA
6.5V
220 RPM
<11 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

Our sample's fan ran 200 RPM higher than its specified speed. At 12V it was very loud and didn't become quiet until it crossed the 1000 RPM mark somewhere between 8V and 7V. As the fan has an unusually high starting voltage of 6.2V, it won't spin-up when used with 5V adapters/mods. Under 7V, the speed dropped off quickly.

Test Results

Though the Panther has the size to take on a high thermal load, its lack of LGA1366 compatibility forced us to test it on our less demanding LGA1155 test platform featuring a mildly overclocked/overvolted Sandy Bridge Core i5 processor.

Prolimatech Panther
Fan Voltage
Fan Speed
SPL@1m
°C Rise above Ambient
CPU
VRM
RAM
Stock Fan
12V
1800 RPM
34~35 dBA
28
16
14
9V
1400 RPM
27 dBA
30
20
18
8V
1190 RPM
22 dBA
32
22
19
7V
850 RPM
15 dBA
35
24
22
6.7V
560 RPM
13 dBA
42
30
25
Reference Nexus 120mm Fan
12V
1080 RPM
17 dBA
31
28
24
9V
880 RPM
14 dBA
33
30
26
7V
720 RPM
12~13 dBA
36
31
25

The Panther performed very well at all tested fan speeds except the ultra low 6.7V / 560 RPM level. Its thermal sweet spot lay somewhere in the fairly quiet range between 8V and 7V. The stock fan wasn't particularly impressive as our reference Nexus fan was substantially more efficient. The difference was most dramatic at low speeds; the heatsink paired with stock fan had a thermal rise of 42°C when generating 13 dBA@1m while the Nexus produced a 6°C improvement at 12~13 dBA@1m.



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