Scythe prints a range for every fan
Each row gives dBA at the fan's minimum and maximum rated speed, next to rpm, airflow and static pressure ranges built the same way. Only the upper number, at full speed, is ranked here.
When two identical fans ship together, a cooler page labels the rows "ファン１基あたり", meaning per fan. The MUGEN6 BLACK EDITION reads "3.0 ～ 26.88 dBA" for each of its two fans, for example, while the FUMA3 prints one row for its front fan and another for its rear.
No whole-cooler number appears anywhere, and no microphone distance or test standard either. Why that matters when setting one brand against another is the subject of our piece on comparing decibel ratings.
How loud is the Scythe Fuma 3?
23.8 dBA for the front fan and 28.6 dBA for the rear, each at 1500 rpm. At the 300 rpm minimum, the two list 2.58 and 4.0 dBA.
The figures differ. So do the fans. The front KAZE FLEX II 120 is 15 mm thick and moves up to 39.44 CFM; the rear one is 26 mm thick and moves up to 67.62. Both mount on a twin tower that stands 154 mm tall. Scythe does not add the two together, and a buyer should not either: the pair at full speed will sound louder than either row alone, by an amount the page never states.
Its 1500 rpm cap is the lowest top speed of any current Scythe tower, 500 rpm under the MUGEN6, MAGOROKU and KOTETSU MARK4 fans.
Which Scythe tower cooler lists the least noise?
It depends on which fan you count. By the loudest fan in the box, the MUGEN6 BLACK EDITION and the MAGOROKU tie at 26.88 dBA per fan at 2,000 rpm. By the quietest single fan, the FUMA3 front fan leads at 23.8.
| Tower | Fans | Top figure per fan | Top speed |
|---|
| FUMA3 (SCFM-3000) | Two, unlike | 23.8 dBA front, 28.6 dBA rear | 1500 rpm |
| MUGEN6 BLACK EDITION (SCMG-6000DBE) | Two, matched | 26.88 dBA | 2,000 rpm |
| MAGOROKU (SCMR-1000) | Not stated | 26.88 dBA | 2,000 rpm |
| KOTETSU MARK4 (SCKTT-4000) | One | 28.88 dBA | 2000 rpm |
With one quieter and one louder fan, the FUMA3 cannot sit cleanly above or below the MUGEN6. Pick it for the slower ceiling, or the MUGEN6 for two equal fans.
The Kotetsu Mark 4 lists 2 dBA more than the Mugen 6
Scythe gives no reason. Both pages name a WONDER TORNADO 120 PWM fan, and both print the same 7.68 to 60.29 CFM airflow and 0.05 to 2.45 mm H2O pressure up to 2,000 rpm. Yet the KOTETSU MARK4 row reads 28.88 dBA and the MUGEN6 row 26.88. The WONDER TORNADO three pack page sides with the MUGEN6, at "3 ~ 26.88 dBA", which leaves the KOTETSU MARK4 figure as the odd one out, and a single changed digit is a plausible cause.
The same table also gives the KOTETSU MARK4 depth as "80(D) m", where every other dimension on Scythe's pages is in millimetres.
Treat the 28.88 with some caution until Scythe corrects or confirms it.
One low profile cooler, the SHURIKEN3
The SHURIKEN3 (SCSK-3000) lists 1.8 to 31.78 dBA from a 92 mm by 16 mm fan running 300 to 2500 rpm. It is 39 mm tall, down from 58 mm on the SHURIKEN2 it replaced.
The fan is a custom KAZE FLEX II 92 SLIM AH PWM, blowing down onto the board, and Scythe says a standard 25 mm thick 92 mm fan can replace it, with screws for one in the box. That 31.78 dBA top is the highest of the current Scythe coolers, the usual cost of a small fan spun fast. The 120mm BIG SHURIKEN line, including the BIG SHURIKEN3, its Rev.B and the BIG SHURIKEN4, is filed under discontinued products.
What is the quietest Scythe fan?
The WONDER SNAIL 120 PWM 1200rpm, at 18.6 dBA. The KAZE FLEX 140 SQUARE at 1200 rpm follows at 19.4 dBA and is the lowest we found on Amazon by model number.
| 120mm fan, 25 to 27 mm thick | Model | Top figure | Top speed |
|---|
| WONDER SNAIL 120 PWM | WS1225FD12-P | 18.6 dBA, with 37.73 CFM | 1200 rpm |
| WONDER SNAIL 120 PWM | WS1225FD18-P | 22.9 dBA | 1800 rpm |
| GRAND TORNADO 120 PWM | GT1225FD20-P | 23.37 dBA; 15.78 at 1200 rpm on its low speed cable | 2000 rpm |
| KAZE FLEX 120 PWM | SU1225FD12M-RHP | 24.9 dBA | 1200 rpm |
| WONDER TORNADO 120 PWM three pack | WT1225FD20X3-P | 26.88 dBA | 2000 rpm |
| KAZE FLEX II 120 PWM | KFS1225FD15-P/A | 28.6 dBA | 1500 rpm |
| WONDER SNAIL 120 PWM | WS1225FD24-P | 29.3 dBA | 2400 rpm |
| KAZE FLEX II 120 PWM | KFS1225FD20-P | 36.2 dBA | 2000 rpm |
Other sizes are fewer. The 15 mm KAZE FLEX II 120 PWM SLIM lists 27.8 dBA at 1800 rpm. In 140mm, the KAZE FLEX 140 SQUARE lists 19.4 dBA at 1200 rpm, and the round KAZE-FLEX 140mm, which mounts on 120mm holes, 26.45 dBA at 1800 rpm. For more fans in that size, see our 140mm case fan guide.
The bottom of each range is the useful number
It is the fan's figure at its minimum rated speed, and it shows how quiet a cooler can get on a gentle fan curve. Most Scythe fans list 4 dBA or less there. The SHURIKEN3 has the lowest floor at 1.8 dBA, then the slim KAZE FLEX II fans at 2.58, and the WONDER TORNADO fans on the MUGEN6, MAGOROKU and KOTETSU MARK4 list 3.0.
The GRAND TORNADO is the exception, at 9.3 dBA, because its minimum speed is 400 rpm rather than 300 or 350.
One warning from Scythe applies to all of them: a 3-pin header or the peripheral adapter disables PWM and runs a fan at full rated speed, skipping the low end entirely.
Discontinued Scythe coolers and fans
Scythe Japan moves retired models into a discontinued products category. On November 8, 2026 it held the KOTETSU MARK3, NINJA5, CHOTEN and single fan MUGEN6, among others, though the KOTETSU MARK3 was still listed in stock on Amazon that day.
| Discontinued cooler | Model numbers or versions |
|---|
| KOTETSU | MARK3 (SCKTT-3000) and the earlier KOTETSU Mark II |
| MUGEN6 | Single fan (SCMG-6000) and DUAL FAN WHITE ARGB EDITION (SCMG-6000DWR) |
| NINJA5 and CHOTEN | SCNJ-5000 and SCCT-1000 |
| BIG SHURIKEN | BIG SHURIKEN3 (SCBSK-3000), its Rev.B (SCBSK-3100) and BIG SHURIKEN4 (SCBSK-4000) |
| Older towers | FUMA2 and FUMA2 Rev.B, MUGEN5 in several revisions, and KATANA5 |
Among fans, the single WONDER TORNADO 120 PWM (WT1225FD20-P) and its ARGB 2500 rpm version are filed as discontinued, while the three pack stays current. The retail KFS1225FD15-P is marked as ended, and its simple package version remains.
Not every cooler on Scythe's site is a Scythe
Scythe Japan distributes other brands too, and its cooler categories mix them in. On November 8, 2026, the only Scythe branded current air coolers were the FUMA3, MUGEN6 BLACK EDITION, MAGOROKU, KOTETSU MARK4 and SHURIKEN3.
The RZ620, RZ700D, RZ820, RT400 and RT500TC towers on the same pages are CPS products. The HP-600 is Jonsbo's, and the JF100-RS is JIUSHARK's. The fan category likewise lists CPS, PCCooler and XASTRA fans beside Scythe's own. And there is no Scythe liquid cooler in the current lineup: every model in the water cooling category is a CPS product, so this page leaves them out.
Where do you buy Scythe coolers in the US?
Through retailers, since Scythe no longer runs a working US website. Each pick above had a new, in-stock Amazon listing under the Scythe brand on November 8, 2026.
Amazon titles do not always carry Scythe's model numbers. The FUMA3 and MAGOROKU listings chosen here name the cooler but not SCFM-3000 or SCMR-1000; Scythe sells each in one version, so the name identifies it. The KOTETSU MARK4 and three of the fan listings carry the model number. The KAZE FLEX 140 SQUARE appeared in stock with its model number too, but the Scythe listing linked here gives only its 140mm size and 1200 rpm speed.
Before buying a fan, match the rpm in the listing to the model on Scythe's page. One name can cover a 1200, 1800 and 2400 rpm version.
