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Custom RTX 5090 water block drops GPU temps by 30C
To maintain a constant temperature for the coolant, it was poured into a bucket, which served as the reservoir. After each pass, the coolant was discharged into a separate bottle. That’s one way of doing things, I guess. Either way, the pump speed was gradually lowered, and the user plotted the temperature of their modified IHS and a standard liquid cooler on a temperature-time graph. While idling and under a 60W load, the custom IHS cold plate ran cooler. Yet, as the pump speed was reduced, the temperature immediately began to climb, exceeding the conventional liquid cooler.
There’s likely a good reason why this happens. The custom IHS solution, per the modder, shortens the distance from the CPU’s die to the coolant by a factor of four. And that will have a noticeable impact. However, the tradeoff comes in the form of a smaller surface area and a design that’s likely less optimized than traditional water blocks. Unlike cold plates, which spread heat, this approach focuses it in one area, which could explain the rapid temperature increase as shown in the graph.
That being said, for those who live on the edge, machining an IHS into a water block might still prove a viable method, as long as the coolant flow rate is kept in check. This really isn’t practical for the average user, and even seasoned veterans might have a tough time getting the execution right. However, it would be great to see a follow-up with a more thorough examination and potentially better designs.
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