Ultra High Performance Full-Cover GPU Water Block for Asus ROG Astral GeForce RTX 5090 Graphics Cards
.The cooling performance of the DeltaMate GPU Block for the ROG Astral RTX 5090 is primarily driven by the optimized flow design of the coolant across the massive copper cooler. The cooler consists of two interlocked sections: the smaller core coldplate for the GPU die, and the VRM/VRAM coldplate for video memory (VRAM) and voltage regulation modules (VRM), which, together with the aluminum housing, form the complete water block. The VRM/VRAM coldplate, weighing over 1,100 grams, is CNC-machined from high-quality copper and subsequently glass bead blasted to ensure a uniform surface finish. The contact surfaces for the VRAM and VRM are then finely remachined using CNC processing after blasting to ensure maximum heat transfer. In the final step, all copper parts are nickel-plated. The separately milled Ultra High-Performance Coldplate is also glass bead blasted before the GPU contact surface is given a precision-machined finish. Thermal Grizzly's Ultra High-Performance coldplates for both CPU and GPU coolers are manufactured with a minimal and highly optimized slot and fin spacing. In the case of the DeltaMate GPU Block – ROG Astral RTX 5090, the slot width on the nickel-plated copper coldplate is 0.2 mm, and the fin width is also 0.2 mm, with a fin height of 2.5 mm. This results in a total surface area of 21,009 mm² for the core coldplate. This level of detail is possible because the coldplates are CNC-machined, rather than produced using the skiving process. While skiving can achieve similar fin structures, it relies on extreme mechanical force to raise the fins, which plastically deforms the material, resulting in reduced thermal performance.

“The Oracle” PCB and RGB Lighting
The DeltaMate ROG Astral RTX 5090 Black GPU Water Block features an integrated spacer PCB (also known as a “dummy” PCB) called the “The Oracle” PCB, which is precisely matched to the layout and dimensions of the ROG Astral RTX 5090 graphics card PCB. This dummy PCB allows the water block to be used directly out of the box to simplify the planning of a custom water cooling loop. This enables the user to verify proper alignment and fit before any disassembly takes place, significantly streamlining the custom loop setup process.
The “The Oracle” PCB also serves as a template for the installation process, providing helpful information such as screw positions and thermal pad placement. After installing the water block, it can also be reused to remount the original air cooler for storage purposes. Inside the black anodized aluminum housing of the water block is a strip of 27 addressable RGB LEDs that illuminate the tempered acrylic viewing window. These LEDs can be controlled via a 3-pin ARGB header (+5V/DATA/GND) on the motherboard. After the milling process, the acrylic undergoes a thermal annealing process to relieve internal stresses. This ensures that no stress cracks develop over time, as can happen with tempered acrylic under long-term use.

Modular Design and Scope of Delivery
The DeltaMate GPU Water Block for the ROG Astral RTX 5090 is shipped with the DeltaMate GPU Block - Direct Terminal made of brass as a pre-installed terminal. The terminal provides one inlet and one outlet with G1/4-inch threads, both facing the front when installed in a standard ATX case. With the DeltaMate GPU Block - Through Terminal, Thermal Grizzly also offers an optional, separately available terminal with two inlets and two outlets located at the top and bottom of the terminal. For installation on the GPU water block, the scope of delivery includes all necessary thermal interface materials (TIMs): TG Putty Advance (optionally usable as a replacement for thermal pads), TG Duronaut, TG Minus Pad Advance, and TG Minus Pad High Compression.

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