Razer Kunai Hydraulic 140MM aRGB PC Fan: Quiet
Bottom line: The Razer Kunai Hydraulic 140MM aRGB PC Fan: Quiet ($39.95 on Amazon as of 2026-10-07): Hydraulic bearing runs quiet at low RPM; main trade-off: PWM controller sold separately, adds cost.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Hydraulic bearing runs quiet at low RPM
- ✓ Daisy-chain up to 8 fans on one controller
- ✓ aRGB with 16.8M colors via Razer Chroma
- ✓ PWM speed control for airflow vs noise
Cons
- ✗ PWM controller sold separately, adds cost
- ✗ aRGB effects need Razer Synapse software
- ✗ Locked into Razer ecosystem for sync
- ✗ Standard 140x25mm depth, no slim option
Manufacturer description
Get form and function that blows you away. Meet the Razer Kunai hydraulic bearing performance aRGB fans powered by Razer Chroma™ with fan blade technology inspired by elite military aircraft for stealthy, efficient cooling, and addressable LEDs for unique case designs.
SpecPicks Verdict
SpecPicks scored Razer Kunai Hydraulic 140MM aRGB PC Fan: Quiet using a rating × review-volume × price-fit model applied to published specs and reviews across the cooling & fans category. Compare with similarly-priced alternatives in the cooling & fans category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for cooling & fans of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- Quiet, Powerful: Cool your PC with high airflow aRGB fans packed with LEDs and lighting effects powered by Razer Chroma RGB
- Connect Up to 8 Fans: Daisy chain and connect up to 8 Razer Kunai fans to Pulse Width Modulation and aRGB controllers to create immersive lighting effects - supported by Razer Synapse software for ultimate customization
- PWM Fan Controller Support: Whether you need maximum airflow to cool your PC or run quietly at lower RPMs, our Pulse Width Modulation fan controller allows you to conveniently adjust fan speed based on your needs (PWM fan sold separately)
- Powered by Razer Chroma RGB: Unlock ultimate aRGB customization with 16.8 million colors, light patterns, and effects which react to your gameplay - get the world’s largest lighting ecosystem and control it from one platform
- Dimensions: 140 mm (L) x 25 mm (W) x 140 mm (H) / 5.5"x 0.98"x 5.5"
Full Specifications
| Brand | Razer |
|---|---|
| Model | RC21-01800200-R3M1 |
| Voltage | 12 volts |
| Wattage | 3.6 watts |
| Material | Copper |
| Dimensions | 140 mm (L) x 25 mm (W) x 140 mm (H) / 5.5"x 0.98"x 5.5" |
| Unit Count | 1 Count |
| Noise Level | 15 db |
| Part Number | RC21-01800200-R3M1 |
| Compatibility | PC |
| Material Type | Copper |
| Cooling Method | Fan |
| Item Type Name | PC Cooling Fans |
| Number of Items | 1 |
| Number of Packs | 1 |
| Quiet, Powerful | Cool your PC with high airflow aRGB fans packed with LEDs and lighting effects powered by Razer Chroma RGB |
| Air Flow Capacity | 81 cfm |
| Compatible Devices | Desktop |
| Included Components | Fan |
| Power Connector Type | 4-Pin |
| Full listing title | Razer Kunai Hydraulic 140MM aRGB PC Fan: Quiet, Powerful aRGB Fan - PWM Fan Controller Support & Connect Up to 8 Fans - Powered by Razer Chroma RGB - 1 Fan |
Ready to buy?
Razer Kunai Hydraulic 140MM aRGB PC Fan: Quiet, Powerful aRGB Fan - PWM Fan Controller Support & Connect Up to 8 Fans - Powered by Razer Chroma RGB - 1 Fan is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.
Related Cooling & Fans
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Best Retro Handhelds in 2026 — From $35 to $500
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- How to Build a Windows 98 Retro PC in 2026
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- Best 1440p Gaming GPUs in 2026
More reviews from the SpecPicks archive
Browse all reviews →- Best Cooler for the Ryzen 7 5800X: NH-U12S vs AK620 vs ML240L
- AMD Radeon RX 9070 GRE Review: Thoroughly Midrange
- MiMo-V2.5-Pro Local Hardware Requirements: VRAM, Tok/s, and Quantization on Consumer GPUs
- Best SSD for PS4 Pro in 2026: SATA Upgrades That Cut Load Times
- Samsung's 256GB microSD Falls to $47.99 — Plus the SSD Sidegrade
- Microsoft + NVIDIA's 'Agent PC': What Local Hardware Does an On-Device AI Agent Actually Need in 2026?
- Best GPU for Ryzen 5 5500 in 2026 (Budget to 1440p)
- Best GPU for Ryzen 7 9800X3D in 2026: Pairing Guide
- Strix Halo Clustering for Local LLMs: What the LocalLLaMA Reports Show
- GLM-5.2's Long-Horizon Agent Mode: Running It Locally in 2026
- Build a Low-Power Pi Home Server with NVMe in 2026
- Best Gaming Monitor for 1440p in 2026
- Building a CompactFlash Boot Drive for a Windows 98 Retro PC
- Best Raspberry Pi Projects for College Students in 2026: 8 Builds on a Pi 4 8GB
- Best CPU Cooler for the Ryzen 7 5800X: NH-U12S vs ML240L vs AIRCOM S7
- Can a Raspberry Pi 4 8GB Run a Local LLM? What Actually Works in 2026
- Can a Raspberry Pi 4 8GB Run a Local LLM in 2026? Realistic tok/s Numbers
- Can the RTX 3060 12GB Still Game at 1440p in 2026?
- Best AMD Ryzen 5000 CPUs for AM4 in 2026
- Best AIO Liquid Cooler for Ryzen X3D & High-End Intel (2026)
- Active Quake 3 and OpenArena Servers in 2026 — How to Find and Join Them
- Local LLM on Mac: The 2026 Setup Guide
- The Best Retro Game Emulators for Mac in 2026
- Best Budget Gaming CPU: Ryzen 5 5600G vs 5700X vs i7-9700K
Earliest SpecPicks reviews
Browse full archive →- Best GPU for Llama 3.1 8B (2026)
- Best GPU for Qwen 3 14B (2026)
- Best GPU for Qwen 3 32B (2026)
- Best GPU for Llama 3.1 70B (2026)
- Best GPU for DeepSeek-R1 32B (2026)
- Best GPU for Llama 3.1 405B (2026)
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 5090
- How to run DeepSeek-R1 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 4090