Passive vs Active CPU Coolers: Which Should You Buy?
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Choosing between a passive vs active CPU cooler depends on your server’s airflow and noise limits. Both the Supermicro and Dynatron units fit 2U server chassis and support modern Intel sockets. The main difference lies in how they move heat. One relies on case fans for airflow, while the other includes its own fan. This changes the noise profile and cooling capacity significantly for your specific build.
Key differences
| Aspect | Supermicro 2U Server CPU Cooler | Dynatron 2U Active Server CPU Cooler |
|---|---|---|
| Cooling Method | Passive | Active |
| Socket Compatibility | LGA1156, LGA1155 | LGA 115X, LGA 1200 |
| Fan Speed | 2800 RPM | not listed |
| Noise Level | 33.5 dBA | not listed |
| Material | not listed | Copper, Aluminum |
| Bearing Type | not listed | 2 Ball Bearing |
Which one should you choose?
Choose Supermicro 2U Server CPU Cooler if
- You need support for older LGA1156 or LGA1155 processors in a 2U chassis.
- You want to rely on existing server fans to keep the system silent at 33.5 dBA.
- You prefer a cooler that does not generate its own fan noise.
Choose Dynatron 2U Active Server CPU Cooler if
- You require compatibility with newer LGA 1200 sockets.
- You need a self-contained active cooling solution with its own fan.
- You want a design featuring copper base and aluminum fins with heat pipes.
Verdict: The Supermicro unit suits older systems where case airflow is sufficient and low noise is critical. The Dynatron cooler is better for newer LGA1200 platforms needing dedicated active cooling. Choose based on your socket generation and noise tolerance.
Passive vs Active Cooling Specs
Cooling Method
The Supermicro unit is a passive cooler, meaning it relies entirely on case airflow to dissipate heat. It has no internal fan. The Dynatron model is an active cooler, equipped with a fan that moves air directly over the heatsink. Active cooling generally handles higher thermal loads more effectively because it forces air through the fins. Passive designs are quieter but depend on strong system fans. You should choose based on your server’s existing airflow capabilities and noise requirements.
Socket Compatibility
The Supermicro cooler supports LGA1156 and LGA1155 sockets, targeting older Xeon and Core i3/i5/i7 processors. The Dynatron cooler supports LGA115X and LGA1200 sockets. LGA1200 is a newer standard used in recent Intel generations. If you are building or upgrading a modern server with a 10th or 11th Gen Intel CPU, the Dynatron is the compatible choice. The Supermicro unit will not fit these newer sockets. Check your processor socket type carefully before purchasing either unit.
Fan Speed
The Supermicro specification lists a fan speed of 2800 RPM, despite being labeled passive. This likely refers to the recommended case fan speed or an integrated component not fully detailed in the passive label. The Dynatron data does not list a specific fan speed or noise level in dBA. It mentions a ball bearing type, which affects longevity. Without specific RPM or decibel data for the Dynatron fan, we cannot directly compare airflow volume or noise output. The Supermicro provides a concrete number for fan rotation.
Build Material
The Dynatron cooler explicitly uses a copper base and aluminum fins with embedded heat pipes. Copper conducts heat away from the CPU faster than aluminum alone. The Supermicro data does not specify the base material or the presence of heat pipes in the provided attributes. It only lists dimensions and weight. The use of heat pipes in the Dynatron design helps distribute heat across the aluminum fins more efficiently. This material combination is generally superior for thermal transfer in active cooling scenarios.
Dimensions
The Supermicro cooler measures 3.6 inches in width, height, and length. This converts to approximately 91.4 millimeters per side. The Dynatron cooler measures 94.0 x 87.5 x 67.7 millimeters. Both units are designed for 2U server chassis. The Supermicro is slightly taller in profile at 3.6 inches compared to the Dynatron’s 67.7mm height. The Dynatron is narrower in width. Both fit within standard 2U rack space. The Supermicro is more cubic in shape, while the Dynatron is flatter.
Which CPU Cooler Fits Your Server
Older LGA1155 server owner
You need compatibility with legacy LGA1155 sockets. This Supermicro unit supports LGA1156 and LGA1155. It uses a push-in pin mount. The passive design relies on case airflow. It fits 2U chassis. Choose this if your existing fans provide sufficient air movement for your Xeon or Core i processors without adding internal fan noise.
Modern LGA1200 upgrade buyer
You are upgrading to newer LGA1200 processors. This Dynatron cooler explicitly supports LGA1200 and LGA115X sockets. It features an active cooling method with a built-in fan. The copper base and aluminum fins with heat pipes help move heat efficiently. Select this model to ensure proper socket support and active thermal management for your current hardware.
Low noise preference user
You want to minimize acoustic output in your workspace. The Supermicro passive cooler has no internal fan, eliminating fan noise entirely. It relies on your server chassis fans for airflow. While it lacks active components, this design ensures silent operation. If your case airflow is adequate, this cooler provides cooling without the additional decibel level of an active unit.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Supermicro 2U Server CPU Cooler | 2U server chassis with LGA1155/1156 CPUs | Check price of Supermicro 2U Server CPU Cooler on Amazon |
| 2 | Dynatron 2U Active Server CPU Cooler | 2U server chassis with LGA 115X or LGA 1200 | Check price of Dynatron 2U Active Server CPU Cooler on Amazon |
The products compared
Supermicro 2U Server CPU Cooler
Best for: 2U server chassis with LGA1155/1156 CPUs
- Cooling Method
- Passive (what this guide is about)
- Socket Compatibility
- LGA1156, LGA1155
- Fan Speed
- 2800 RPM
- Server Height
- 2U
- Dimensions
- 3.6 × 3.6 × 3.6 inches
- Weight
- 1 pounds
View on Amazon: Supermicro 2U Server CPU Cooler Affiliate link
This Supermicro unit combines a passive heatsink with an active fan for 2U server and workstation applications. It supports LGA1155 and LGA1156 sockets, covering Xeon 3400 and Core i3/i5/i7 processors. The fan runs at 2800 RPM, producing 33.5 dBA of noise. It uses a push-in pin mounting method. The build weighs 1 pound and measures 3.6 inches on each side. It suits users needing compact, reliable cooling for specific older server hardware.
Pros
- Supports LGA1155 and LGA1156 sockets
- Fan speed of 2800 RPM
- Noise level of 33.5 dBA
- Push-in pin mounting method
Cons
- Limited to 2U server chassis height
- Only supports older LGA1155 and LGA1156 sockets
- No support for modern LGA1700 or AM5 sockets
Good fit if
- You are building a 2U server or workstation
- You use an Intel Xeon 3400 or Core i3/i5/i7 processor
- You need a compact 3.6-inch square cooler
Skip if
- You have a modern motherboard with LGA1700 or AM5 sockets
- You are building a standard desktop PC case
- You need support for newer Intel or AMD CPU generations
Verdict: Supermicro 2U Passive Active CPU Cooler is a specialized cooling solution for 2U server environments. It fits users with LGA1155 or LGA1156 processors who require a low-profile, push-in mounted cooler.
Dynatron 2U Active Server CPU Cooler
Best for: 2U server chassis with LGA 115X or LGA 1200
- Cooling Method
- Active (what this guide is about)
- Socket Compatibility
- LGA 115X, LGA 1200
- Server Height
- 2U
- Material
- Copper, Aluminum
- Dimensions
- 6 × 6 × 6 inches
View on Amazon: Dynatron 2U Active Server CPU Cooler Affiliate link
The Dynatron K555 is an active air cooler designed for 2U server chassis. It features a copper base with aluminum fins and embedded heat pipes for efficient heat transfer. The unit measures 94.0 x 87.5 x 67.7mm and uses dual ball bearings for durability. It supports LGA 115X and LGA 1200 sockets, making it suitable for specific desktop or server builds requiring low-profile active cooling.
Pros
- Copper base with aluminum fins and heat pipes
- Dual ball bearing fan for longevity
- Supports LGA 115X and LGA 1200 sockets
- Compact 2U form factor fits server chassis
Cons
- Limited socket compatibility excludes modern platforms
- Small fin stack height restricts airflow potential
- Specific 2U height may not fit standard cases
Good fit if
- You need a cooler for a 2U server chassis
- You use an LGA 115X or LGA 1200 CPU
- You require a low-profile active cooling solution
Skip if
- You use a socket not listed in the data
- You need a standard ATX tower cooler
- You require support for newer Intel sockets
Verdict: The Dynatron K555 2U Active CPU Cooler is a specialized active cooler for 2U enclosures. It fits users with LGA 115X or LGA 1200 CPUs who need a compact, durable cooling solution with copper and aluminum construction.
Specifications side by side
| Spec | Supermicro 2U Server CPU Cooler | Dynatron 2U Active Server CPU Cooler |
|---|---|---|
| Socket Compatibility | LGA1156, LGA1155 | LGA 115X, LGA 1200 |
| Fan Speed | 2800 RPM | not stated |
| Server Height | 2U | 2U |
| Cooling Method | Passive | Active |
| Material | not stated | Copper, Aluminum |
| Dimensions | 3.6 × 3.6 × 3.6 inches | 6 × 6 × 6 inches |
| Weight | 1 pounds | not stated |
| Model | SNK-P0046A4 | K555 |
Frequently asked questions
Do passive CPU coolers work in standard servers?
Yes, they work if your server chassis has strong airflow. The Supermicro 2U Server CPU Cooler relies entirely on case fans to dissipate heat. It has no internal fan. You must ensure your server fans move enough air across the fins. This design suits environments where silence is critical.
Which cooler is better for LGA 1200 processors?
The Dynatron 2U Active Server CPU Cooler is the better choice for LGA 1200. The Supermicro model only supports LGA 1155 and LGA 1156 sockets. The Dynatron unit features an active fan to handle the thermal load. It also uses copper and aluminum materials for efficient heat transfer.
Is a 2U passive cooler louder than an active one?
A passive cooler is generally quieter because it has no internal fan. The Supermicro unit has zero moving parts inside the heatsink. However, your server fans must work harder to push air through the fins. The Dynatron active cooler uses its own fan, which may add noise but moves air more directly.
Can I install a 2U cooler in a desktop PC?
You can, but you need a case with sufficient height. These units are designed for 2U server chassis. The Supermicro cooler is 3.6 inches tall. The Dynatron model is 6 inches tall. You must check your desktop case clearance. These are specialized server components, not typical desktop air coolers.
What materials are used in these server coolers?
The Dynatron model uses both copper and aluminum. This combination helps conduct heat away from the CPU base quickly. The Supermicro cooler data does not specify its material composition. Both units are built for durability in server environments. The active Dynatron design includes a fan for continuous airflow.
How do I mount a push-in cooler?
The Supermicro 2U Server CPU Cooler uses a push-in pin mount. You align the pins with the socket holes on your motherboard. Press down firmly until the pins lock into place. This method is common for legacy LGA 1155 and LGA 1156 processors. Ensure the cooler sits flat on the CPU.