DeepCool Assassin IV CPU Air Cooler - Dual-Tower Quiet/Performance

Our review of the DeepCool Assassin IV finds it aimed at PC builders who want high air-cooling performance without a loud, obtrusive cooler. The single biggest reason to buy is the dual-mode switchable fans that let this dual-tower cooler move from a near-silent desktop presence to a higher-RPM performance setup with a simple mechanical switch, making it flexible for both quiet workstations and performance-oriented gaming rigs. It also preserves RAM clearance and includes an optional bracket for a third fan, all wrapped in a minimal, elegant black design.

Key Features

• Dual-Mode Switch: A manual performance/quiet slider lets the cooler be tuned quickly for low-noise tasks or maximum airflow without software changes.
• Seven Heat Pipes: Seven heat pipes route heat through the push-fin twin towers to provide strong dissipation for high TDP CPUs.
• FDB PWM Fans: The included 140mm and 120mm true FDB PWM fans deliver stable airflow and lower noise compared with prior designs.
• RAM Clearance: The cooler is designed to maintain 100% RAM clearance on modern sockets and the third fan bracket can be adjusted to avoid tall modules.
• Magnetic Top Cover: The magnetic mesh top fan cover assists heat dissipation and simplifies fan access during installation or cleaning.
• Accessory Thermal Paste: Industrial grade DM9 thermal paste is included to help achieve reliable thermal transfer out of the box.

Who It's For

This cooler is best for enthusiasts and serious builders who need a high-capacity air cooler that can adapt between low-noise everyday use and more aggressive cooling for sustained loads. It suits systems using Intel LGA 1700/1200/115X/20XX or AMD AM5/AM4 where tower height up to 164mm fits the case.

Those who should look elsewhere include compact mini-ITX builders with tight top clearance or users who need an all-in-one liquid cooler for small form factor cases. Also, if you prefer software-controlled fan curves exclusively, the physical switch approach may feel less flexible than a fully software-managed solution.

Pros & Cons

Pros

• Excellent flexibility with a manual performance/quiet mode switch for real-world noise control.
• Strong thermal design with seven heat pipes and dual-tower fins for heavy workloads.
• Good compatibility and RAM clearance with an adjustable third fan bracket for push-pull setups.
• Includes high-grade DM9 thermal paste and a magnetic mesh top for tidy aesthetics and serviceability.

Cons

• At full performance the unit can be large and needs a case with up to 164mm CPU cooler clearance.
• The manual switch offers fewer fine-grain control options than software-controlled fan profiles.

Specifications

Height	164mm
Supported Sockets	Intel LGA 1700/1200/115X/20XX; AMD AM5/AM4
Fans	140mm intake + 120mm exhaust true FDB PWM
Fan Speeds	140mm up to 1700RPM (performance) / 1350RPM (quiet)
Noise Level	29.3 dB(A) performance / 22.6 dB(A) quiet (overall)
Included Accessories	Optional third fan bracket, DM9 thermal paste, mounting hardware

Our Verdict

The DeepCool Assassin IV is a well-rounded air cooler for builders who want a premium dual-tower solution that can switch between whisper-quiet operation and stronger cooling with minimal fuss. It offers strong thermal capacity, excellent RAM compatibility, and thoughtful extras like a magnetic mesh cover and included thermal paste, making it a compelling value for mid-tower and larger cases where height is not a constraint.

Frequently Asked Questions

Will this fit my motherboard with tall RAM modules?
The design claims 100% RAM clearance for supported sockets and the third fan bracket is adjustable to avoid interference with tall modules.

Can I use the cooler without the optional third fan?
Yes, the third fan is optional; the included 140mm plus 120mm configuration provides strong cooling, and the bracket is there for push-pull upgrades.

Does the switch require software to change modes?
No, the performance/quiet switch is a physical slider on the cooler, so no software is required to change between modes.