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PBO Performance and maximum noise levels
We’re going to start this review’s benchmark section by focusing on a traditional maximum performance test, with the CPU cooler’s fans allowed to reach their fastest speeds, for the best cooling possible.
Turning on PBO allows AMD’s Ryzen 9 9950X3D to stretch its legs to an extent and consume over 260W. Enabling PBO enables high power consumption and heat output, when using MSI’s X870E Carbon Wifi motherboard, the CPU will reach its TJ Max (peak temperature) of 95 degrees C (203 F) and thermally throttle to some extent with most coolers. When this throttling occurs, I’ve measured the average power consumption to determine performance.
High-end AIO liquid coolers have higher expectations in this benchmark, and are expected to be able to keep AMD’s Ryzen 9 9950X3D under TJ Max during the duration of the benchmark – in these cases, we compare the CPU’s actual temperature.
Ocypus’ Sigma L36 Pro performs well and is capable of keeping the CPU cool in this test, with an average temperature of 85.7C/186.3F.
Some coolers perform well in maximum strength tests, but run loudly at full speeds. Noisy fans in this scenario aren’t necessarily a bad thing; some folks prefer to hear them as a way to be aware when the CPU is getting hot.
The fans included with Ocypus’ Sigma L36 Pro reach 49.8 dBA at 100% RPM, which is loud, but to be expected of fans with 5.8mm H20 of air pressure. Those who prefer to implement speed restrictions for silent operation need not worry; our noise-normalized benchmarks show good performance even when the fans are set to run quietly.
200W thermal benchmarks
For the next thermal test, I leave the motherboard settings at their defaults, which results in a power limit of 200W when running Cinebench R23.
When compared to the other seven AIOs we’ve tested Ocypus Sigma L36 Pro against, its performance is behind most of its peers. That said, the gap between Ocypus’ AIO and the top performer is rather small – the average temperature of 70.5C (48.5C above ambient) achieved by the Sigma L36 Pro is only 2.1C behind our best result.
150W + GPU thermal results, noise levels
Our next test runs Cinebench on the CPU with a 150W power limit, while also running Furmark on MSI’s RTX 4070 Ti Super Ventus 3x OC. This causes the GPU to consume ~295W of power. This test is designed to emulate the thermals of games, which primarily stress the CPU and GPU.
Ocypus’ position in this thermal test remains the same as in our previous chart. When tied to the default fan curve of MSI’s X870E Carbon motherboard, it reaches a mild volume level of 41.9 dBA.
Noise-normalized testing
Most testing is performed with the cooler tied to the default fan curve of our MSI X870E Carbon motherboard, but some of y’all prefer to see tests when the noise levels of coolers are equalized. This is especially important to those of you who prefer silent computers. This next test has the CPU cooler noise-normalized to 38.9 dBA, with PBO enabled for the Ryzen 9 9950X3D CPU.Most coolers will not be able to keep the CPU from reaching its peak temperature (TJ Max) in this stress test. So we’ll look at this in terms of average CPU power consumption, which averaged 255.4 watts.
This test is especially difficult because in addition to the reduced noise from the CPU cooler, our current test bench’s system fans are configured to run extremely silently, below the floor of the noise meter I use to measure dBA.
Conclusion
Ocypus’ Sigma L36 Pro features an attractive combination of features, including a fancy 3.5-inch LCD display. Those things alone make this AIO interesting and worth considering, but it’s also affordable, with a regular price of only $135, and often on sale for less. In fact, as this review was wrapping up, the black version of the Sigma L36 Pro was on sale at Amazon for just $105. At that price, it’s inarguably a CPU-cooling steal.
