Der8auer, a German hardware enthusiast, tested a 2004 Q‑Tec KS70 liquid cooler on an AMD Ryzen 7 9800X3D. The cooler, originally designed for AMD Athlon and Pentium 4 processors, was mounted using a custom 3D‑printed AM5 socket that allowed the copper block to fit inside a 5.25‑inch drive bay. In gaming workloads, the CPU ran at 5.2 GHz with usage under 30 percent and temperatures around 60 °C, indicating stable operation. When subjected to the Cinebench R23 stress test, the processor maintained nearly 5.0 GHz but temperatures rose to approximately 95 °C, exceeding the limits of many modern cooling solutions. The test highlighted restricted airflow when the radiator was mounted outside the case, which further limited cooling performance under sustained load. While the cooler functioned for light to moderate use, it proved inadequate for intensive workloads. The results suggest that legacy liquid coolers may require case modifications to remain effective with contemporary high‑performance processors.