Thermal Grizzly DeltaMate GPU Block - Astral GeForce RTX 5090 (TG-DM-GPU-001)

Thermal Grizzly's DeltaMate GPU Block - ROG Astral RTX 5090 is a full-cover GPU water block for ASUS ROG Astral GeForce RTX 5090 graphics cards, here with the tempered acrylic (PMMA) viewing window.

Properties

• Fits: ASUS ROG Astral and Astral LC GeForce RTX 5090
• Cold plates: Nickel-plated copper, 86 microfins at 0.2 mm
• Window: Tempered PMMA (acrylic), 27 addressable RGB LEDs
• Ports: 2x G1/4-inch, 28 mm apart
• Size: 28.2 x 13.5 x 2.8 cm, 1.5 slots
• Weight: 2142 g, 3600 g boxed

Massive copper cooler with dual cold plate design

The block features a massive copper cooler composed of two coldplates secured together with screws, and the coolant flow across it is what Thermal Grizzly credits for the cooling performance. The smaller core coldplate makes direct contact with the GPU die. It is a modular Ultra High-Performance Coldplate, milled separately, with a slot width of 0.2 mm, a fin width of 0.2 mm and a fin height of 2.5 mm. That results in a nickel-plated copper surface area of 21,009 mm² on the core coldplate alone.

The larger VRM/VRAM coldplate is designed for cooling the video memory (VRAM) and the voltage regulation modules (VRM), giving targeted cooling for all VRAM and VRM components. It weighs over 1,100 grams and is also made of nickel-plated copper. After glass bead blasting, the contact surfaces for the GPU, VRAM and VRM are finely CNC-machined to ensure optimal thermal transfer. Both plates are CNC-machined rather than made by the skiving process. Skiving can produce a similar microfin structure, but according to Thermal Grizzly it deforms the material as the fins are raised, which can reduce cooling performance.

Durability and design

This is a full metal construction: a black anodized aluminum housing (6082 alloy) and backplate around the cold plates, sealed with EPDM O-rings, with an RGB-illuminated viewing window on top. Integrated into the housing is a strip of 27 addressable RGB LEDs that illuminate the tempered acrylic. These LEDs plug into the motherboard and are controlled via its 3-pin ARGB header (+5V/DATA/GND). Once the milling process is done, the acrylic glass undergoes an annealing process to relieve internal stresses. Thermal Grizzly says this ensures that no stress cracks form over time, as can occur with tempered acrylic during prolonged use.

Terminal and fittings

The block comes pre-equipped with the DeltaMate GPU Block - Direct Terminal, made of solid nickel-plated brass and featuring one inlet and one outlet, each with G1/4-inch threading. In a standard ATX case both ports face the front of the case. Brass is an alloy of copper and zinc. It offers the advantage of being anodically compatible with other metals while being both harder and more corrosion-resistant than pure copper. Both ports must be used, so the block takes two compression fittings, such as the DeltaMate 16/10.

The block is configurable with either direct (2-port) or pass-through (4-port) brass fittings. The 4-port option is the separate Through Terminal, which adds inlet and outlet ports on the top and bottom for more ways to route the tubes.

In the box

• DeltaMate GPU Block - ROG Astral RTX 5090 Black
• HexThinHead M2.5 x 4mm screws, black
• HexThinHead M2.5 x 6mm screws, black
• DIN934 M2.5 nuts, black
• M2.5 polyamide washers
• Pair of latex gloves
• Allen keys: 1.5 mm, 2 mm, 2.5 mm and 8 mm
• TG Spatula and TG Spatula Pro
• TG Putty Advance, 30g
• TG Duronaut, 6g
• TG Minus Pads Advance in 1.0 mm, 1.5 mm and 2.0 mm
• TG Minus Pad High Compression in 3.0 mm and 4.0 mm