Alphacool NexXxoS ST25 Full Copper 240mm Radiator (14353)

The Alphacool NexXxoS ST25 Full Copper 240mm Radiator is a slim 240 mm radiator for two 120 mm fans, which the data sheet lists as ultra flat with 25 mm height. The end chambers, the water channels and the cooling fins are copper, and it has two G1/4 ports.

Properties

• Fans: 2x 120 mm
• Size (L x W x H): 272 x 120 x 25.5 mm (+/- 3%)
• Thickness: 25 mm
• Ports: 2x G1/4
• Material: copper cooling fins, chambers and cooling channels, brass threads, stainless steel outer housing
• Fin density: 15 FPI

Make no compromises, use copper

As usual, Alphacool uses pure copper for the NexXxoS ST25 slim radiators: end chambers, water channels and cooling fins are all made of it. Alphacool calls that a unique selling point worldwide and says no other manufacturer relies on pure copper for all these components combined. As a result, it says, it has been producing one of the most popular and highest performing radiators on the market for many years. In Alphacool's words that is providing "the perfect foundation for every water cooling system".

Full cooling capacity

To maximize the performance of a radiator, Alphacool says it reaches deep into its bag of tricks, and copper is the starting point. It gives a thermal conductivity of 400 W/(mK) for copper compared to 236 W/(mK) for aluminum and calls the winner clear. Alongside this comes what Alphacool calls its special fin density. Alphacool describes itself as one of the oldest companies in the field of water cooling. It says it has carried out countless laboratory tests, and the result is a fin spacing of 15 FPI. This means the air flow is only slightly obstructed, as the air can pass through even without high pressure. However, Alphacool says the cooling capacity does not suffer from this, on the contrary. To use the airflow optimally, all cooling fins have small serrations: tiny flaps that guide the airflow in the desired direction and increase the surface area. These are barely 1 mm high in the case of radiators, but Alphacool says they still provide controlled air turbulence to increase cooling capacity and minimize airflow noise.

What the loop needs

The radiator has two G1/4 threads and a loop uses both, so it takes two fittings. It is built for 120 mm fans, and Alphacool gives the possible fan assembly as 2 x one-sided / 4 x both-sided. The box has eight M3x30mm, eight M3x5 mm and eight M3x35 mm screws and an Allen key.

Technical data

• L x W x H: 272 x 120 x 25.5 mm (+/- 3%)
• Quantity of cooling channels: 12
• FPI: 15
• Material cooling fins: Copper
• Material chambers: Copper
• Material cooling channels: Copper
• Material threads: Brass
• Material outer housing: stainless steel
• G1/4 threads: 2 x
• For fan size: 120 mm
• Possible fan assembly: 2 x one-sided / 4 x both-sided
• Pressure tested: 0.8 bar

Notes

• Use only clear, transparent water cooling fluids. Alphacool warns that the particles and additives in pastel liquids can clog and permanently damage radiators, pumps, coolers and hoses, which can void the manufacturer's warranty.

In the box

• 1x NexXxoS ST25 240mm Radiator
• 8x M3x30mm screws
• 8x M3x5 mm screws
• 8x M3x35 mm screws
• 1x Allen key
• Mounting Instructions