Thermal Grizzly's pricey Deltamate GPU Block reduces overclocked RTX 5080 temps by 20 degrees

Thermal Grizzly's new DeltaMate GPU Block is specifically built for the premium ROG Astral GeForce RTX 5080 GPU from ASUS. It features a "massive copper cooler" with a dual-cold-plate design, one for the GPU die and one for the VRM/VRAM. The VRM/VRAM-Coldplate alone weighs over 900 grams and is built with custom CNC machining to enhance heat transfer and thermal performance.

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Interestingly, Thermal Grizzly notes that the DeltaMate GPU Block for the Astral RTX 5080 proved more challenging and complex to build than its previous RTX 5090 model, even though the RTX 5080 draws significantly less power. The reason is that the GeForce RTX 5080 has higher power density than the RTX 5090, making it harder to cool. Basically, it's a smaller, more densely packed GPU.

This helps explain why the price of the DeltaMate GPU Block for the Astral RTX 5080 is currently listed at $643.38 USD, given that it was difficult for Thermal Grizzly to source parts in Europe without paying inflated prices. And when you add in the specialized cold plates, anodized aluminum housing, brass terminals, reinforced glass window, and intricate design, that is why it costs roughly a third of the ASUS flagship GeForce RTX 5080 GPU it's designed to cool. The good news on that front is that it's highly effective.

As detailed in a new video from tech enthusiast der8auer, we get to see the DeltaMate GPU Block for the Astral RTX 5080 in action. During an intensive Furmark stress test, we see the GPU temperature hovering around 50 degrees Celsius, with the memory temperature at 44 degrees. According to der8auer, this is a 20+°C temperature reduction compared to using the ROG Astral's stock air cooler. We reviewed the ASUS ROG Astral GeForce RTX 5080 OC Edition last year, so check out our full review to see how it performs out of the box.