StarTech FAN1156PWM LGA1155/1156 PWM CPU Cooler

Overview

The StarTech FAN1156PWM is a variable-speed PWM-controlled CPU cooler designed specifically for Intel LGA1155 and LGA1156 socket platforms. Built around a 95mm aluminum heatsink paired with a 95mm fan, it gives system builders and integrators a straightforward thermal management solution for rack-mounted servers, edge compute nodes, or embedded surveillance systems where predictable, low-noise cooling matters. The LP4 4-pin PWM connector allows the motherboard to modulate fan speed automatically between 1000 and 3000 RPM, so the system runs quieter during light loads and ramps cooling capacity when workloads spike — without manual intervention.

Key Features

• PWM Speed Control (1000–3000 RPM): The variable speed range means the cooler adjusts to actual thermal demand rather than running flat-out 24/7. At idle or light load, the fan spins toward 1000 RPM — acoustically negligible in most rack environments. Under sustained processing load it scales to 3000 RPM, delivering the full 65.61 CFM needed to keep the CPU within operating limits.
• 65.61 CFM Airflow: That volume of airflow through a 95mm x 20mm aluminum heatsink is adequate for the thermal design power (TDP) envelopes of LGA1155/1156 processors in their intended operating range. For passive or low-airflow chassis, confirm the chassis layout allows the cooler to exhaust heat effectively — the cooler moves the air, but the chassis must route it out.
• Sub-33 dBA Noise Floor: At under 33 dBA, this cooler stays below conversational speech levels even at maximum RPM. For deployments in office environments, control rooms, or anywhere an audible fan would be disruptive, that ceiling matters. Compare this to generic 80mm coolers that often exceed 38–42 dBA at equivalent speeds.
• Ever Lubricate Bearing with 40,000-Hour MTBF: The self-lubricating bearing design reduces maintenance friction over time. 40,000 hours of rated bearing life translates to roughly 4.5 years of continuous operation — reasonable for a cooler in a rack-mounted appliance that won't be serviced frequently. It won't match fluid dynamic bearing (FDB) specs on high-end server fans, but it's appropriate for this price and platform tier.
• 95mm x 95mm x 25mm Fan / 95mm x 95mm x 20mm Heatsink: The combined assembly fits within standard LGA1155/1156 cooler clearance envelopes. At 5.5 cm total installed height, verify clearance inside 1U or compact ITX enclosures before ordering — this form factor is better suited to mid-tower, 2U, or open-frame chassis.
• 12V DC / 350 mA Input: Draws 4.2W at full load — negligible on any modern motherboard's fan header power budget. No supplemental power wiring required beyond the LP4 connector already present on most LGA1155/1156 boards.
• Operating Range -10°C to 70°C: The cooler itself tolerates the ambient temperature range common in server rooms and industrial edge deployments. The lower -10°C threshold means it can spin up in a cold-start environment without bearing damage, which matters in unheated equipment rooms during winter commissioning.
• 274g Total Weight: At under 300g, the assembly doesn't impose meaningful stress on socket retention clips, which matters for systems that ship assembled or experience vibration in transit — a relevant consideration for mobile command units or vehicle-mounted compute platforms.

Integration and Compatibility

The FAN1156PWM is purpose-built for Intel LGA1156 and LGA1155 socket motherboards. LGA1156 covers first-generation Core i3/i5/i7 (Lynnfield/Clarkdale) and Xeon 3400-series processors. LGA1155 covers second- and third-generation Core processors (Sandy Bridge, Ivy Bridge) and Xeon E3-1200-series. If your platform uses a different socket — LGA1150, LGA1151, LGA2011, or AMD AM4/AM5 — this cooler will not mount correctly. Confirm your board's socket designation before ordering.

The LP4 4-pin PWM connector is the standard Intel fan header format used on these platforms. The PWM signal line allows the motherboard's BIOS fan control to manage speed curves automatically. Systems without PWM-capable fan headers will still run the fan, but at a fixed speed without variable control.

With a storage temperature range down to -20°C and operating humidity tolerance of 0–65% RH (non-condensing), the unit ships and stores safely in typical warehouse and logistics conditions without special climate controls.

Frequently Asked Questions

Q: What CPU sockets is the FAN1156PWM compatible with?

A: The FAN1156PWM is designed for Intel LGA1156 and LGA1155 sockets. LGA1156 supports first-gen Core i3/i5/i7 (Lynnfield/Clarkdale) and Xeon 3400-series. LGA1155 supports second- and third-gen Core (Sandy Bridge, Ivy Bridge) and Xeon E3-1200-series. It is not compatible with LGA1150, LGA1151, LGA2011, or any AMD socket.

Q: Does the FAN1156PWM require PWM-capable fan headers to function?

A: No — it will run on a standard 4-pin LP4 header regardless of PWM support. However, without a PWM-capable header, the motherboard cannot modulate fan speed automatically. You'll get full airflow but lose the variable speed control that keeps noise low at idle.

Q: What is the noise level of the FAN1156PWM at maximum speed?

A: The rated noise ceiling is under 33 dBA at 3000 RPM. At lower RPM (closer to the 1000 RPM minimum under PWM control), acoustic output will be considerably lower.

Q: Will the FAN1156PWM fit inside a 1U rackmount chassis?

A: The total installed height is approximately 55mm (5.5 cm). Standard 1U chassis have an internal clearance of roughly 40–44mm, so this cooler will not fit in a 1U enclosure. It is better suited for 2U, mid-tower, or open-frame chassis with adequate vertical clearance.

Q: What is the warranty on the FAN1156PWM?

A: The FAN1156PWM carries a 2-year manufacturer warranty.

Q: What is the expected service life of the FAN1156PWM bearing?

A: The Ever Lubricate bearing is rated to 40,000 hours MTBF, equivalent to approximately 4.5 years of continuous 24/7 operation under rated conditions.

James Everett

I get asked fairly often whether the FAN1156PWM makes sense for edge appliances and surveillance compute nodes built on LGA1155 platforms — and the honest answer is yes, with one important caveat. The 65.61 CFM airflow ceiling and the 40,000-hour MTBF bearing are adequate for the thermal loads you'll see running Xeon E3-1200-series or Sandy Bridge Core processors in a climate-controlled rack room. Where it gets tricky is chassis selection: the 55mm installed height is the number that kills installs, not the cooler's thermal performance.

Technical Highlights:

• PWM Range (1000–3000 RPM): The 3:1 speed ratio gives the motherboard's fan controller genuine headroom to keep acoustics down during overnight recording workloads when CPU load drops — relevant in surveillance NVR-adjacent compute where the processor is lightly loaded for hours at a time.
• Sub-33 dBA Noise Ceiling: In a control room or operations center where background noise matters, staying under 33 dBA at max speed means this cooler won't be the loudest component in a compact tower or 2U appliance build.
• 40,000-Hour MTBF: For a unit that goes into an edge node and won't be serviced for 12–18 months at a stretch, a bearing rated to 4.5 years continuous operation gives reasonable confidence in the maintenance interval — though I'd still plan a swap at the 3-year mark to stay ahead of failure.

Deployment Considerations:

• Confirm chassis internal clearance exceeds 55mm before ordering. The FAN1156PWM will not seat in a standard 1U enclosure — this is the single most common install mistake on this form factor.
• The 0–65% RH operating humidity limit is non-condensing. Deploy this in a sealed or climate-controlled enclosure if the installation environment experiences humidity swings that could cause condensation — outdoor edge nodes or poorly ventilated utility closets are the risk scenarios.

For an LGA1155-based surveillance analytics node or a Sandy Bridge Xeon workstation in a 2U or tower chassis that needs quiet, automatic thermal management without a dedicated fan controller, the FAN1156PWM is the right fit — provided the chassis gives it room to breathe.