Water block Aqua-Computer 21703 — Acetal/Nickel, Socket AM4, 111×75×22 mm, Black/Silver

The Aqua-Computer 21703 is a CPU water block engineered for liquid cooling loops in custom and performance-oriented PC builds. Constructed with an acetal top and nickel-plated base surfaces, the block measures 111 × 75 × 22 mm and is specifically designed for AMD Socket AM4 processors. Coolant is guided across a finely structured base to transfer heat away from the CPU into the loop, providing a compact, low-profile solution for high-performance cooling setups.

Advantages

The design combines acetal top material with nickel-plated metal contact surfaces to balance durability, corrosion resistance and thermal transfer. A micro-structured base promotes efficient coolant flow across the CPU contact area, improving heat extraction. The retention system uses robust metal plates and spring-loaded fasteners to deliver stable, even contact pressure on Socket AM4 motherboards without the need for an additional back plate. The compact dimensions (111×75×22 mm) make the block suitable for constrained layouts while maintaining performance characteristics expected in modern liquid-cooling components.

Suitable for

• Custom PC liquid-cooling loops for AMD Socket AM4 systems
• Performance-oriented desktop builds where efficient CPU heat transfer is required
• Compact cases or configurations with limited clearance above the CPU
• Users who prefer nickel-plated cooling surfaces and a black/silver aesthetic

Key specifications

• Product type: water block for CPU liquid cooling
• Compatible socket: Socket AM4
• Materials: acetal top with nickel-plated contact surfaces
• External finish: black (top) and silver (nickel-plated areas)
• Dimensions (L×W×H): 111 × 75 × 22 mm
• Retention: metal plates with spring cups and thumb screws for even clamping

How to use

Install the Aqua-Computer 21703 over a clean CPU surface following the motherboard and cooler mounting instructions. Apply a thin, even layer of thermal compound to the CPU integrated heat spreader; Aqua-Computer supplies a high-performance compound with similar products and a small spatula is typically included for even distribution. Position the water block on the socket, secure the retention screws progressively and evenly until the mechanical stop or recommended torque is reached, and connect the inlet and outlet ports to the existing loop tubing. Verify there are no leaks, then perform an initial leak test with the system powered off before normal operation.

Recommendations

The block is optimized for systems with Socket AM4; do not attempt to mount it on incompatible sockets. Use high-quality tubing and fittings and perform a full leak test after installation. Maintain the cooling loop with periodic coolant replacement and system checks to preserve thermal performance and prevent corrosion. If the system includes a separate motherboard back plate for AM4, follow the motherboard vendor instructions; otherwise the standard AM4 mounting should provide the required support.