Alphacool
Alphacool NexXxoS XT45 Full Copper X-Flow Radiator
Best high-performance radiator for enthusiasts building quiet, large-format custom cooling loops.
Enhance your custom water cooling system with the Alphacool NexXxoS XT45 400mm Radiator. Crafted entirely from copper, it ensures superior heat dissipation for optimal system performance. Its broad cooling surface area rivals larger radiators, while the low fin density promotes quiet, efficient airflow, perfect for demanding builds. This radiator features convenient G1/4" ports for easy connections and supports two large 200mm fans, offering the flexibility for passive cooling. Achieve exceptional thermal management for your high-performance PC with this premium component.
$79.99
Owner Satisfaction
4.6
/ 5
Category Rank
632
/ 3605
#632 in Computer System Cooling Parts
Price vs Category Average
-47%
Below average
Dimensions (L x W x H)
44020048
/ x x mm
Who it's for
- Performance enthusiasts seeking maximum heat dissipation efficiency
- System builders prioritizing long-term durability and reliable hardware
- Custom loop designers needing simplified tubing paths
Who should skip it
- Users with space-constrained small form factor cases
- Budget-conscious builders looking for cost-effective cooling solutions
- Overclockers demanding the absolute highest thermal exchange capacity
Performance breakdown
Thermal Dissipation
Full copper construction ensures elite heat transfer for high-end custom loops.
Acoustic Efficiency
Low fin density allows for whisper-quiet operation at lower fan speeds.
Loop Versatility
Seven G1/4 ports provide unmatched flexibility for complex tubing configurations.
Build Robustness
Premium steel housing and copper internals offer exceptional long-term durability.
Airflow Optimization
Designed specifically to maximize the cooling potential of large 200mm fans.
Passive Cooling Capacity
Massive surface area enables effective heat dissipation without active fan assistance.
Key Specs
Dimensions (L x W x H)
440 x 200 x 48 mm
Material
Copper (fins, channels, end chambers), Steel (housing)
Thickness
45mm (48mm overall height)
Fan Size Support
200 mm (2 slots)
Fin Density
12 FPI (Fins Per Inch)
Threads
7 x G1/4” ports
Net Weight
1725 g
Pressure Tested
0.8 bar
Features
- All-copper construction for maximum heat transfer
- Expansive cooling surface area
- Quiet and efficient airflow
- Supports large 200mm fans
- Versatile G1/4" port connections
- Optional passive cooling mode
- Optimized for custom water cooling
- Durable steel housing
What customers say
Enthusiasts highly praise the Alphacool XT45 radiator for its exceptional cooling performance, driven by its full copper construction and substantial thickness. The X-Flow design is a significant advantage, simplifying complex water cooling loops by optimizing flow dynamics and reducing tubing requirements. Users value the robust build quality inherent in the all-copper materials, viewing it as a premium component. While case compatibility requires consideration due to its size, the radiator is widely regarded as a top choice for serious builders prioritizing maximum thermal efficiency and intelligent, streamlined loop integration.
Know before you buy
The X-Flow design allows water to flow straight through the radiator from one side to the other rather than looping back. This reduces flow resistance, which can help maintain better coolant circulation in complex custom loops.
Yes, the radiator is designed with a low fin density of 12 FPI, which allows for effective heat dissipation even without active airflow. However, passive performance will depend heavily on your total system heat load and ambient room temperature.
Yes, the G1/4" threads are the industry standard for custom water cooling. You can use any standard G1/4" compression or barb fitting with this radiator.
With dimensions of 440 x 200 mm, this is a very large radiator. You should verify that your case specifically supports 200mm fan mounts or has a dedicated mounting area large enough to accommodate the 440mm length.
Because the fins, channels, and chambers are all made of copper, you avoid the corrosion issues that occur when mixing different metals like aluminum and copper. Always use a high-quality coolant with anti-corrosive inhibitors to keep your loop in top condition.
This radiator features seven G1/4" ports in total. This provides significant flexibility for routing your tubing and allows for easier filling or draining of your loop depending on the radiator's orientation.
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