Wathai 120mm 38mm High-Speed DC vs Wathai 80mm High-Airflow 38mm PWM (2026): Key Differences
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You are comparing the wathai 120mm 38mm high speed DC vs 80mm high airflow 38mm pwm fans. Both models offer 38mm thickness and high airflow for cooling tasks. The main difference lies in their physical size and control method. The 120mm fan uses a simple 2-pin DC connection, while the 80mm variant features a 4-pin PWM interface for motherboard speed adjustment. You need to match the fan size to your available space and the connector to your power source.
Key differences
| Aspect | Wathai 120mm 38mm High-Speed DC Fan | Wathai 80mm High-Airflow 38mm PWM Fan |
|---|---|---|
| Fan Size | 120mm | 80mm |
| Connector Type | 2-pin DC | 4-pin PWM |
| Max Fan Speed | 3000RPM | 5500RPM |
| Max Airflow | 118CFM | 72.6CFM |
| Noise Level | 42dBA | 47dBA |
| Bearing Type | not listed | Ball Bearing |
Which one should you choose?
Choose Wathai 120mm 38mm High-Speed DC Fan if
- You need a larger fan to cover a bigger opening or radiator.
- Your power source only provides a 2-pin DC connection.
- You prefer lower noise levels at maximum speed.
Choose Wathai 80mm High-Airflow 38mm PWM Fan if
- You require precise fan speed control via your motherboard.
- You are working in a tight space that fits only an 80mm fan.
- You need a fan designed for high static pressure against dense fins.
Verdict: The 120mm fan is better for general case ventilation where space allows and simple DC power is available. The 80mm PWM fan is the right choice for restricted spaces or when you need adjustable speed control for specific cooling needs.
Size Control and Airflow Specs
Physical dimensions
The Wathai 120mm 38mm High-Speed DC Fan measures 120mm by 120mm by 38mm. It is a larger unit designed for wider vents or open chassis spaces. The Wathai 80mm High-Airflow 38mm PWM Fan is smaller, measuring 80mm by 80mm by 38mm. Both share the same 38mm thickness. You must choose based on your case mounting hole size. The 120mm model covers more area for intake or exhaust. The 80mm model fits tighter or smaller spaces. Neither fan can replace the other if your case requires a specific size.
Airflow capacity
Airflow determines how much air moves through your system. The 120mm fan delivers 118 CFM at full speed. This high volume moves air quickly across components. The 80mm fan provides 72.6 CFM. While lower, this is strong for its smaller size. If you need maximum air movement for a large case, the 120mm model wins. For smaller enclosures, the 80mm fan provides sufficient flow. The difference in CFM reflects the physical size of the blades.
Speed and noise
The 120mm fan runs at a max speed of 3000 RPM. It produces 42 dBA of noise at full load. The 80mm fan spins much faster, reaching 5500 RPM. It generates 47 dBA of noise. Higher RPMs usually mean more noise and vibration. The 80mm fan is louder despite its smaller size. The 120mm fan moves more air at a lower, quieter speed. You might prefer the 120mm fan for a quieter build. The 80mm fan is better if you prioritize speed over silence.
Control connectivity
Connectivity affects how you manage fan speed. The 120mm fan uses a 2-pin DC connector. This provides constant power or basic voltage control. You cannot adjust speed via motherboard software easily. The 80mm fan uses a 4-pin PWM connector. This allows precise speed control through your BIOS. You can set fan curves based on temperature. This offers better efficiency and quieter operation at low loads. The 80mm fan offers superior control for modern motherboards.
Bearing type
The bearing type impacts longevity and stability. The 80mm fan explicitly lists a ball bearing. This design offers a longer lifespan and better stability under heavy use. The 120mm fan data does not specify its bearing type. It lists variations with sleeve or ball bearings, but the specific unit is unclear. If you need a guaranteed long lifespan, the 80mm fan is the safer choice. The ball bearing is rated for higher speeds and temperatures.
Choose Your Wathai Fan
Standard PC builder with large case
The 120mm size fits standard case vents better. Its 118CFM airflow moves more air than the smaller option. The 2-pin connector works with any 12V power source. You get strong cooling for CPUs or GPUs without needing PWM headers on your motherboard.
User needing precise speed control
PWM technology lets your motherboard adjust speed automatically. The 5500RPM max speed offers high static pressure for radiators. You can set trigger temperatures in BIOS for quieter operation. This 80mm fan is ideal for tight spaces where airflow needs to be focused and controlled.
Builder with limited motherboard headers
The 2-pin DC connector is universally compatible. It does not require a PWM header, freeing up your motherboard connections. The 120mm frame provides ample cooling surface area. You get reliable high-speed performance with simple wiring, making installation straightforward for basic builds or server setups.
The products compared
Wathai 120mm 38mm High-Speed DC Fan
Best for: High airflow cooling in RVs or PC cases
- Fan Size
- 120mm
- Max Fan Speed
- 3000RPM
- Max Airflow
- 118CFM
- Noise Level
- 42dBA
- Connector Type
- 2pin
- Dimensions
- 4.72 × 4.72 × 1.5 inches
View on Amazon: Wathai 120mm 38mm High-Speed DC Fan Affiliate link
This Wathai fan delivers high airflow for cooling PC components or RV fridge vents. It features a 120mm x 38mm size and runs at 3000RPM. The 2-pin DC connector draws 12V. You get 118CFM of air movement. Noise reaches 42dBA at full speed. It includes mounting hardware and a grill. This model suits users needing raw cooling power in a standard size.
Pros
- 120mm x 38mm dimensions fit standard mounts
- High 3000RPM speed moves 118CFM of air
- Includes fan grill and mounting screws
- 25cm cable length allows flexible placement
Cons
- 2-pin DC connector lacks PWM speed control
- 42dBA noise level is loud at max speed
- Sleeve bearing variant may have lower lifespan than ball bearing
Good fit if
- You need high static pressure for dense heatsinks
- You are upgrading an RV fridge vent fan
- You require a 120mm fan with a 38mm thickness
Skip if
- You need quiet operation below 30dBA
- You require PWM motherboard control for fan curves
- You prefer a ball bearing for heavy industrial use
Verdict: Wathai 120mm 38mm High-Speed DC Fan offers strong 118CFM airflow for users prioritizing cooling performance over noise levels. It fits those who need a simple 2-pin solution for PC cases or RV appliances.
Wathai 80mm High-Airflow 38mm PWM Fan
Best for: High-airflow cooling in compact or server cases
- Fan Size
- 80mm
- Max Fan Speed
- 5500 RPM
- Max Airflow
- 72.6 CFM
- Noise Level
- 47 dBA
- Connector Type
- 4-pin PWM
- Bearing Type
- Dual Ball
View on Amazon: Wathai 80mm High-Airflow 38mm PWM Fan Affiliate link
This 80mm fan delivers high airflow with a maximum speed of 5500 RPM and 72.6 CFM. It uses a 4-pin PWM connector for precise speed control via your motherboard. The 38mm depth and ball bearing design support dense radiator fins. You get adjustable performance between 1600 and 5500 RPM. This unit suits builds needing focused, high-volume air movement in compact spaces.
Pros
- High maximum airflow of 72.6 CFM
- 4-pin PWM connector for motherboard control
- Ball bearing for stable long-term operation
- Wide speed range from 1600 to 5500 RPM
Cons
- Noise level reaches 47 dBA at top speed
- 80mm size is smaller than standard 120mm cases
- Full speed may be too loud for quiet builds
Good fit if
- You need high airflow for dense radiator fins
- You want PWM speed control via BIOS
- You are building in a compact or server enclosure
Skip if
- You require quiet operation at all speeds
- You need a standard 120mm or 140mm fan size
- You prefer brushless motor bearings over ball bearings
Verdict: Wathai 80mm 38mm High-Airflow PWM Fan provides strong airflow for dense cooling setups. It fits users who prioritize volume over silence and have motherboard PWM headers.
Specifications side by side
| Spec | Wathai 120mm 38mm High-Speed DC Fan | Wathai 80mm High-Airflow 38mm PWM Fan |
|---|---|---|
| Fan Size | 120mm | 80mm |
| Max Fan Speed | 3000RPM | 5500 RPM |
| Max Airflow | 118CFM | 72.6 CFM |
| Noise Level | 42dBA | 47 dBA |
| Connector Type | 2pin | 4-pin PWM |
| Bearing Type | not stated | Dual Ball |
| Use | not stated | Server |
| Compatible Device | not stated | CPU Cooler |
| Dimensions | 4.72 × 4.72 × 1.5 inches | 3.15 × 3.15 × 1.5 inches |
| Weight | 8.16 ounces | 2.1 ounces |
| Model | 12038S12V2P2.5 | not stated |
Frequently asked questions
Can I use the 120mm Wathai fan in a standard PC case?
Yes, the Wathai 120mm 38mm High-Speed DC Fan fits standard PC cases. Its 120mm size is common for case vents. The 2-pin connector allows easy connection to any 12V power source. You get strong 118CFM airflow for CPU or component cooling.
Does the 80mm Wathai fan support speed control?
Yes, the Wathai 80mm High-Airflow 38mm PWM Fan supports speed control via PWM. It uses a 4-pin connector that plugs into motherboard headers. This allows your system to adjust fan speed automatically based on temperature needs.
Which fan is better for an RV appliance?
The Wathai 120mm 38mm High-Speed DC Fan is better for RVs. It offers strong 118CFM airflow for effective cooling. The simple 2-pin design works well with various 12V power sources found in recreational vehicles. It is built for high airflow tasks.
What is the thickness of both Wathai fans?
Both fans share a 38mm thickness. The 120mm model measures 120mm by 120mm by 38mm. The 80mm model measures 80mm by 80mm by 38mm. This consistent depth allows them to fit similar mounting spaces despite their different widths and heights.
How do I connect the 120mm DC fan?
You connect the 120mm DC fan using its 2-pin connector. This simple interface works with any 12V power source. You do not need a motherboard PWM header. It is ideal for users who prefer a straightforward wiring setup.
Is the 80mm fan suitable for server cases?
Yes, the Wathai 80mm High-Airflow PWM Fan suits server cases. Its compact 80mm size fits dense cooling setups. The 4-pin PWM connector allows precise speed management. It provides strong airflow for high-density environments where space is limited.
Which fan moves more air?
The Wathai 120mm 38mm High-Speed DC Fan moves more air. It delivers 118CFM of airflow. This volume exceeds the output of the smaller 80mm model. You should choose the 120mm fan if maximizing air movement is your primary goal.
Do I need a specific motherboard for the PWM fan?
You need a motherboard with a 4-pin PWM header for the 80mm fan. This header provides automatic speed control. The 120mm DC fan does not require this, as it uses a basic 2-pin connection. Choose based on your available headers.