Alphacool
Alphacool NexXxoS ST25 Full Copper 240mm Radiator
Best copper radiator for compact custom liquid cooling builds.
Elevate your PC's cooling with the Alphacool NexXxoS ST25 Full Copper 240mm Radiator. Engineered for peak performance, this radiator boasts an all-copper construction, including fins, channels, and chambers, for exceptional heat dissipation. Its 45mm thickness strikes an ideal balance for various custom water cooling builds. Featuring separated chambers for optimized coolant flow and multiple G1/4" ports, integration is both flexible and straightforward. A built-in protective ledge safeguards against over-screwing, ensuring durability and quiet operation even with lower-speed fans.
$79.99
Owner Satisfaction
4.7
/ 5
Category Rank
152
/ 3597
#152 in Computer System Cooling Parts
Price vs Category Average
-47%
Below average
Dimensions (L x B x H)
27712446
/ x x mm
Who it's for
- Custom loop designers needing flexible routing and maintenance options
- Performance enthusiasts seeking maximum heat transfer efficiency
- System builders working within compact, space-constrained chassis
Who should skip it
- Users preferring silent, low-airflow cooling configurations
- Overclockers pushing hardware to extreme thermal limits
- Budget-conscious builders prioritizing cost over premium materials
Performance breakdown
Thermal conductivity
Full copper construction ensures rapid heat transfer for demanding cooling loops.
Build durability
Robust materials and protective ledges prevent common installation mishaps.
Installation flexibility
Multiple G1/4 ports allow for versatile tubing configurations in tight spaces.
Acoustic efficiency
Optimized fin density maintains quiet operation even at lower fan speeds.
Flow optimization
Separated chambers reduce flow resistance for consistent coolant circulation.
Case compatibility
Balanced 45mm thickness fits most standard mid-tower chassis configurations.
Key Specs
Dimensions (L x B x H)
277 x 124 x 46mm
Material
Full Copper (Chambers, Channels, Fins), Steel (Case)
Radiator Size
240mm (Supports 2x120mm fans)
Thickness
45mm
Connectors
6x G1/4"
Fan Mounting Thread
M3
Pressure Tested
2 Bar
Model Number
AC-14164
Features
- Full copper construction for superior heat transfer
- Optimized fin design for quiet fan operation
- Separated chambers enhance coolant flow
- Flexible mounting with multiple G1/4" ports
- Integrated protective ledge prevents damage
- Easy integration into custom water loops
- Reliable cooling for demanding systems
- Balanced 45mm thickness for versatile builds
What customers say
Customers highly value the Alphacool NexXxoS ST25 radiator primarily for its exceptional design and premium quality, making it a top choice for compact builds. Its slim 25mm profile is frequently praised as ideal for Small Form Factor systems where clearance is limited. The full copper construction is recognized as the gold standard for superior heat dissipation, even within this thin form factor. Enthusiasts appreciate the inclusion of multiple G1/4" ports, offering crucial flexibility for loop configuration, filling, and draining—a feature often missing in comparable slim radiators. While performance is excellent relative to its size, users accept the inherent trade-off compared to thicker units. Overall, the ST25 delivers reliable, high quality thermal performance perfectly suited for space constrained water cooling.
Know before you buy
Yes, the NexXxoS ST25 features a full copper build, including the fins, channels, and chambers. This design maximizes thermal conductivity for more efficient heat dissipation compared to aluminum or brass alternatives.
While the radiator itself is 45mm thick, you must account for the additional space required for your fans. We recommend checking your case's clearance for a total thickness of approximately 70mm to ensure it doesn't interfere with your motherboard or RAM.
Yes, this radiator uses industry-standard G1/4" threads. You can use any standard G1/4" compression or barb fittings compatible with your tubing size.
The integrated protective ledge prevents you from accidentally screwing your fan bolts too deep into the radiator. This stops the screws from puncturing the cooling channels, which could otherwise cause a leak.
Yes, the fin density is optimized to allow for good airflow even at lower fan speeds. This makes it a great choice for users looking to build a quiet, high-performance custom loop.
This model features six G1/4" ports, providing significant flexibility for your loop layout. This allows you to choose the best entry and exit points to simplify your tubing runs.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$80