The Alphacool ES Copper/Carbon water cooler with backplate was developed for the Alphacool Enterprise Series. Due to the positioning of the connections, the hosing of the cooler in the server rack is significantly simplified. The top and the Backplate of the cooler is made of carbon. This makes the water cooler lighter compared to Alphacool's Eisblocks with acetal or acrylic tops. This cooler is 1U compatible! Connections on the back? In order to save space in the width and height during installation, the water input and output have been moved to the back of the cooling block. This positioning of the connections makes hosing much easier. It enables easy integration of the GPU cooler into the water circuit even in the tightest server housings. Copper or aluminum? Alphacool uses only copper for all water-bearing parts. Copper has almost twice the thermal conductivity of aluminum and is therefore clearly the better choice of material for water cooling. The chrome-plated copper base is highly resistant to acid, which means that chipping of the chrome plating can be ruled out. Compatibility: - Inno3D GeForce RTX 4090 iCHILL Black, 24GB GDDR6X (C4090-246XX-18330005) - Inno3D GeForce RTX 4090 iCHILL Frostbite, 24GB GDDR6X (C4090-246XX-1833FB) - Inno3D GeForce RTX 4090 iCHILL X3, 24GB GDDR6X (C40903-246XX-1833VA47) - Inno3D GeForce RTX 4090 X3 OC, 24GB GDDR6X (N40903-246XX-18332989) - KFA² GeForce RTX 4090 SG (1-Click OC), 24GB GDDR6X (49NXM5MD6DSK) Technical data cooler Dimensions (L x W x H): 234,21 x 119,69 x 19,29mm Backplate height: 1mm Weight (total): 1120g Material cooler: Chome-plated copper Material cooler top: carbon Threads: 2 x G1/4" Maximum working temperature: 60 °C Pressure tested: 8 Bar Color: Black/carbon Model: 13869