Sometimes they don’t even get a chance and are immediately replaced by other, “better” ones. We’re talking about fans that come pre-installed in computer cases. We are going to test one of them now and although there are reasons to replace the Dynamic X2 GP-12 (PWM), be careful not to end up being worse off. After all, these aren’t exactly ordinary fans. They even have more specific aerodynamics and acoustics modifying features.
Results: Frequency response of sound w/o obstacles
Measurements are performed in the TrueRTA application, which records sound in a range of 240 frequencies in the recorded range of 20–20,000 Hz. For the possibility of comparison across articles, we export the dominant frequency from the low (20–200 Hz), medium (201–2,000 Hz) and high (2,001–20,000 Hz) range to standard bar graphs.
However, for an even more detailed analysis of the sound expression, it is important to perceive the overall shape of the graph and the intensity of all frequencies/tones. If you don’t understand something in the graphs or tables below, you’ll find the answers to all your questions in this article. It explains how to read the measured data below correctly.
Noise levels in the tables below -85 dBu (but watch out for the negative sign, -70 dBu is louder than -80 dBu) can be ignored. They are in fact extremely weak and always far below the limit of human perception, and are often defined by the “noise” of the measurement string. Therefore, do not take even the dominant frequencies within the treble band that exceed 12 kHz too much into account.
| Fan | Dominant sound freq. and noise level, no obstacle@33 dBA | NF-F12 PWM | NF-A15 PWM | ||||
| Low range | Mid range | High range | |||||
| Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | ||
| Fractal Design Dynamic X2 GP-12 PWM | 47,6 | -72,8 | 1015,4 | -79,9 | 19897,0 | -90,7 | |
| BeQuiet! Pure Wings 2 (BL039) | 47,6 | -78,3 | 958,9 | -79,6 | 18780,2 | -91,0 | |
| Gigabyte Aorus 120 ARGB | 130,7 | -82,8 | 369,7 | -80,7 | 19330,5 | -90,9 | |
| Arctic BioniX P120 A-RGB | 127,0 | -73,2 | 219,8 | -70,4 | 19897,0 | -90,9 | |
| Akasa OTTO SF12 | N/A | N/A | N/A | N/A | N/A | N/A | |
| Cooler Master SickleFlow 120 ARGB | Cooler Master SickleFlow 120 ARGB | 59,9 | -82,7 | 1076,3 | -83,1 | 19330,5 | -90,7 |
| Alphacool SL-15 PWM | Alphacool SL-15 PWM | 190,3 | -79,1 | 380,5 | -78,8 | 18245,6 | -90,9 |
| Arctic BioniX F120 | Arctic BioniX F120 | 123,4 | -76,5 | 246,8 | -80,0 | 19330,5 | -90,9 |
| SilverStone SST-AP123 | SilverStone SST-AP123 | 100,8 | -81,2 | 415,0 | -78,6 | 19897,0 | -90,8 |
| Noctua NF-P12 redux-1700 PWM | 103,7 | -76,9 | 329,4 | -73,2 | 19330,5 | -90,9 | |
| SilentiumPC Fluctus 120 PWM | SilentiumPC Fluctus 120 PWM | 130,7 | -76,5 | 369,7 | -80,9 | 19897,0 | -91,0 |
| MSI MEG Silent Gale P12 | 50,4 | -81,7 | 369,7 | -81,0 | 19897,0 | -90,8 | |
| Asus ROG Strix XF120 | 50,4 | -80,2 | 329,4 | -76,2 | 19330,5 | -90,8 | |
| Akasa Vegas X7 | 123,4 | -77,0 | 369,7 | -83,3 | 19330,5 | -90,7 | |
| Reeven Coldwing 12 | 38,9 | -79,7 | 1317,5 | -84,0 | 19330,5 | -90,7 | |
| Reeven Kiran | 138,5 | -80,6 | 369,7 | -83,3 | 19330,5 | -90,8 | |
| SilentiumPC Sigma Pro 120 PWM | N/A | N/A | N/A | N/A | N/A | N/A | |
| SilentiumPC Sigma Pro Corona RGB 120 | 92,4 | -83,0 | 369,7 | -78,0 | 18780,2 | -90,8 | |
| SilverStone SST-AP121 | 47,6 | -77,5 | 261,4 | -86,4 | 19330,5 | -91,0 | |
| SilverStone SST-FQ121 | 31,3 | -87,5 | 1208,2 | -79,9 | 19330,5 | -90,9 | |
| Xigmatek XLF-F1256 | 41,8 | -69,7 | 213,6 | -77,3 | 19330,5 | -91,0 |
| Fan | Dominant sound freq. and noise level, no obstacle@39 dBA | NF-F12 PWM | NF-A15 PWM | ||||
| Low range | Mid range | High range | |||||
| Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | ||
| Fractal Design Dynamic X2 GP-12 PWM | 113,1 | -78,5 | 329,4 | -74,6 | 18780,2 | -90,9 | |
| BeQuiet! Pure Wings 2 (BL039) | 130,7 | -76,1 | 369,7 | -75,3 | 19330,5 | -90,7 | |
| Gigabyte Aorus 120 ARGB | 127,0 | -63,9 | 380,5 | -74,2 | 19330,5 | -90,6 | |
| Arctic BioniX P120 A-RGB | 50,4 | -77,9 | 439,7 | -72,4 | 18780,2 | -91,1 | |
| Akasa OTTO SF12 | 155,4 | -67,1 | 380,5 | -75,2 | 4431,5 | -87,2 | |
| Cooler Master SickleFlow 120 ARGB | 109,9 | -72,8 | 1076,3 | -72,4 | 18245,6 | -90,9 | |
| Alphacool SL-15 PWM | 184,9 | -73,4 | 380,5 | -73,1 | 19897,0 | -90,8 | |
| Arctic BioniX F120 | 151,0 | -69,3 | 369,7 | -75,3 | 18780,2 | -91,0 | |
| SilverStone SST-AP123 | SilverStone SST-AP123 | 164,7 | -75,1 | 369,7 | -74,7 | 19330,5 | -90,9 |
| Noctua NF-P12 redux-1700 PWM | 146,7 | -68,0 | 329,4 | -66,7 | 18245,6 | -91,1 | |
| SilentiumPC Fluctus 120 PWM | 190,3 | -69,2 | 380,5 | -68,8 | 19897,0 | -90,9 | |
| MSI MEG Silent Gale P12 | 23,1 | -73,5 | 380,5 | -73,3 | 18780,2 | -90,9 | |
| Asus ROG Strix XF120 | 130,7 | -70,9 | 369,7 | -75,2 | 19330,5 | -91,0 | |
| Akasa Vegas X7 | 127,0 | -77,8 | 369,7 | -76,1 | 19330,5 | -90,9 | |
| Reeven Coldwing 12 | 160,0 | -74,0 | 369,7 | -76,8 | 19330,5 | -90,9 | |
| Reeven Kiran | 184,9 | -75,2 | 369,7 | -75,2 | 17726,2 | -89,8 | |
| SilentiumPC Sigma Pro 120 PWM | 97,9 | -81,7 | 369,7 | -78,1 | 2635,0 | -86,2 | |
| SilentiumPC Sigma Pro Corona RGB 120 | 20,3 | -67,8 | 380,5 | -77,3 | 2487,1 | -85,6 | |
| SilverStone SST-AP121 | 103,7 | -76,2 | 339,0 | -73,4 | 2031,9 | -86,5 | |
| SilverStone SST-FQ121 | 138,5 | -75,2 | 1208,2 | -71,1 | 18780,2 | -90,9 | |
| Xigmatek XLF-F1256 | 190,3 | -77,1 | 761,1 | -75,5 | 19897,0 | -91,1 |
| Fan | Dominant sound freq. and noise level, no obstacle@45 dBA | NF-F12 PWM | NF-A15 PWM | ||||
| Low range | Mid range | High range | |||||
| Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | Frequency [Hz] | Noise level [dBu] | ||
| Fractal Design Dynamic X2 GP-12 PWM | 146,7 | -72,2 | 391,7 | -71,5 | 2280,7 | -83,1 | |
| BeQuiet! Pure Wings 2 (BL046) | 130,7 | -71,3 | 369,7 | -69,3 | 19330,5 | -90,6 | |
| Gigabyte Aorus 120 ARGB | 160,0 | -61,9 | 369,7 | -70,4 | 2487,1 | -88,3 | |
| Arctic BioniX P120 A-RGB | 151,0 | -67,6 | 369,7 | -72.0 | 2873,5 | -90,6 | |
| Akasa OTTO SF12 | Akasa OTTO SF12 | 190,3 | -66,7 | 380,5 | -67,7 | 4695,1 | -86,3 |
| Cooler Master SickleFlow 120 ARGB | Cooler Master SickleFlow 120 ARGB | 138,5 | -66,7 | 1076,3 | -67,1 | 3835,7 | -89,2 |
| Alphacool SL-15 PWM | Alphacool SL-15 PWM | 151 | -71,5 | 232,9 | -66,5 | 2280,7 | -89,6 |
| Arctic BioniX F120 | Arctic BioniX F120 | 195,8 | -68 | 201,6 | -62,2 | 19330,5 | -90,7 |
| SilverStone SST-AP123 | SilverStone SST-AP123 | 130,7 | -70,9 | 369,7 | -67,7 | 19897 | -90,9 |
| Noctua NF-P12 redux-1700 PWM | Noctua NF-P12 redux-1700 PWM | 184,9 | -62,2 | 369,7 | -67 | 19897 | -91,1 |
| SilentiumPC Fluctus 120 PWM | SilentiumPC Fluctus 120 PWM | 25,6 | -69,6 | 239,7 | -62 | 2957,7 | -90 |
| MSI MEG Silent Gale P12 | MSI MEG Silent Gale P12 | 28,3 | -73,5 | 380,5 | -71 | 2487,1 | -85,9 |
| Asus ROG Strix XF120 | Asus ROG Strix XF120 | 23,1 | -62,9 | 369,7 | -71,7 | 2347,5 | -89,1 |
| Akasa Vegas X7 | Akasa Vegas X7 | N/A | N/A | N/A | N/A | N/A | N/A |
| Reeven Coldwing 12 | Reeven Coldwing 12 | 195,8 | -68,3 | 380,5 | -71,3 | 2031,9 | -90 |
| Reeven Kiran | Reeven Kiran | 130,7 | -73,1 | 219,8 | -70,2 | 17726,2 | -89,4 |
| SilentiumPC Sigma Pro 120 PWM | SilentiumPC Sigma Pro 120 PWM | 138,5 | -70 | 1522,2 | -71,9 | 2560 | -82,9 |
| SilentiumPC Sigma Pro Corona RGB 120 | SilentiumPC Sigma Pro Corona RGB 120 | 190,3 | -70,5 | 369,7 | -66,5 | 2416,3 | -82,4 |
| SilverStone SST-AP121 | SilverStone SST-AP121 | 130,7 | -66,8 | 439,7 | -66,1 | 2347,5 | -90,9 |
| SilverStone SST-FQ121 | SilverStone SST-FQ121 | 127 | -71,2 | 369,7 | -66,5 | 2031,8 | -81,4 |
| Xigmatek XLF-F1256 | Xigmatek XLF-F1256 | 130,7 | -71,5 | 239,7 | -60,9 | 18780,2 | -91,1 |
I’m wondering how reviewed fans relate to 140mm version, Dynamic X2 GP-14.
I have three of them mounted as stock fans in Fractal Design Meshify 2 case and 3x Fluctus 120 PWM in drawer.
GP-12 are clearly inferior to Fluctus, but what about 140mm GP-14 vs 120mm Fluctus when used as 2x intake and 1x exhaust case fan?
Sooner or later we will get to such a comment. Anyway, these are structurally completely different designs, where the Fluctus 120 PWM is handicapped by higher tonal peaks at lower frequencies and with the Dynamic X2 GP-14 it might be again (like the Dynamic X2 GP-12 PWM) a relatively noisier, gently whirring motor. We’ll see…