Reeven Kelveros & Arcziel CPU Coolers

Cooling
Viewing page 5 of 7 pages. Previous 1 2 3 4 5 6 7 Next

Reeven Kelveros: Stock Fan Measurements

Specifications: Reeven Kelveros Stock Fan
Manufacturer
Power Rating
6.24 W
Model Number
RM1225S19C-PS
Airflow Rating
101.3 CFM
Bearing Type
Sleeve
Speed Rating
1900 RPM
Corners
Open
Noise Rating
34.7 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin
Fan Blade Diameter
114 mm
Starting Voltage
< 5.0 V
Hub Size
40 mm
Weight
170 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The stock fan bears a resemblance to Scythe's Slip Stream series due to the soft curves of blades and the curled struts that increase the angle they form with the blade's edges. Spinning at around 1900 RPM, the fan has a substantial power draw of 6.24 W, a tremendous airflow rating of 101.3 CFM and presumably a high noise output to match.

Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
1960 RPM
34 dBA
9V
1600 RPM
30~31 dBA
7V (low)
1330 RPM
25 dBA
6V
1150 RPM
21 dBA
5V
870 RPM
15~16 dBA
4.5V
590 RPM
11 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

Though the Kelveros fan has a high nominal speed, its acoustic character was surprisingly inoffensive for much of its range. It was turbulent and buzzy at higher speeds like many sleeve bearing models, but as the motor was slowed, the noise quality remained more or less constant. The one exception was at 5V where it generated 15~16 dBA@1m and produced on an odd low pitched tone. This seems to be an isolated effect that was only noticeable at or near the 5V level, so for the most part, the fan undervolts well. The included two speed controller acts as a 12V/7V switch which isn't particularly useful as PWM control is now common, and the fan still emitted a loud 25 dBA@1m at 7V.


The Reeven Kelveros stock fan at 5V measures 15~16 dBA@1m.

Our acoustic analysis shows the tone we noted at 5V is centered at approximately 300 Hz. At most other voltages, the fan was surprisingly smooth.

Reeven Kelveros: Test Results

Reeven Kelveros
Fan Voltage
Fan Speed
SPL@1m
°C Rise above Ambient
Stock Fan
12V
1960 RPM
35 dBA
44
9V
1600 RPM
30~31 dBA
45
7V
1330 RPM
25 dBA
46
6V
1150 RPM
21 dBA
47
5V
870 RPM
15~16 dBA
51
4.5V
590 RPM
11 dBA
58
Reference Nexus 120mm Fan
12V
1080 RPM
15~16 dBA
47
9V
880 RPM
13 dBA
51
7V
720 RPM
11~12 dBA
55

The Kelveros' delivered a 44°C rise at top speed, a poor showing as top notch heatsinks can typically reach a similar result with very low fan speeds. Furthermore, the performance barely changed when the fan was slowed to between 9V, 7V, and 6V. The stock fan was essentially bottlenecked by the capabilities of the heatsink. Low speed performance wasn't great either; the stock fan was beaten by our reference Nexus 120 mm fan by 3~4°C operating at similar noise levels.

CPU Coolers (ref. 120mm fan): °C Rise Comparison
Heatsink
Fan voltage / SPL @1m*
12V
9V
7V
15~16 dBA
12~13 dBA
11~12 dBA
Thermalright Ultra-120 eXtreme Rev.C
38
40
43
Thermalright Venomous X
38
41
43
Prolimatech Megahalems
38
41
44
Noctua NH-U12P
39
42
44
Scythe Mugen-2
39
42
45
Cogage TRUE Spirit 1366
40
42
45
Prolimatech Armageddon
40
42
46
Zalman CNPS10X Quiet
40
43
46
Noctua NH-C14
39
42
48
Scythe Yasya
41
43
47
Thermalright Ultra-120 eXtreme
40
43
48
Cooler Master Hyper 212 Plus
41
44
48
Thermalright Archon SB-E
42
43
49
Thermalright Ultra-120
42
45
49
Titan Fenrir
43
46
50
Scythe Ninja 3
44
47
49
Noctua NH-C12P
43
47
51
Zalman CNPS10X Extreme
43
47
53
Swiftech Polaris 120
46
49
54
Zalman CNPS10X Flex
45
50
54
Cooler Master V8
46
50
54
Antec Kühler H20 620
(pump at 7V, almost inaudible)
52
52
53
Reeven Kelveros
47
51
55
Scythe Grand Kama Cross
45
52
57
Arctic Cooling Freezer Xtreme Rev.2
49
52
58
Scythe Kabuto
51
53
60
*Note: there are minor differences in measured SPL due to the variety of fan orientations and mounting methods offered by the compared coolers.

The Kelveros isn't a bad heatsink, but it is incredibly inefficient for its size and weight, ending up near the bottom of our large heatsink performance chart. It was also second worse amongst side-blowing tower coolers, beating only the AC Freezer Xtreme.



Previous 1 2 3 4 5 6 7 Next

Cooling - Article Index
Help support this site, buy from one of our affiliate retailers!
Search: