The DeltaMate GPU Block - ROG Astral RTX 5090 features a massive copper cooler composed of two coldplates secured together. For the core coldplate, which makes direct contact with the GPU die, a modular Ultra High-Performance Coldplate is used, featuring a slot width of 0.2 mm and fin width of 0.2 mm with a height of 2.5 mm. Massive copper cooler with dual cold plate design This results in a nickel-plated copper surface area of 21,009 mm2 for the core coldplate. The VRM/VRAM coldplate, designed for cooling the video memory (VRAM) and voltage regulation modules (VRM), weighs over 1,100 grams and is made of nickel-plated copper. The contact surfaces for the GPU, VRAM, and VRM are finely CNC-machined after glass bead blasting to ensure optimal thermal transfer. Features Ultra high-performance 0.2 mm microfin coldplate Full metal construction with RGB-illuminated viewing window Targeted cooling for all VRAM and VRM components Configurable with pass-through (4-port) or direct (2-port) brass fittings Includes: Thermal Grizzly thermal paste and pads Important Notes The DeltaMate GPU Block - ROG Astral RTX 5090 requires assembly and is recommended for use and installation by experienced users only. Do not use this product in combination with water cooling components made of aluminum that come into contact with coolant, such as radiators with aluminum tubing. We recommend using suitable coolants that contain biocides and corrosion inhibitors and are free of particles that could restrict flow or clog the loop. Before filling, the custom water cooling system should be tested for leaks using an air pressure tester for at least one hour. After filling, the system should be regularly inspected during the first 24 hours for any signs of coolant leakage.