Deepcool Captain 240 EX All-In-One CPU Cooler

Deepcool states its mission is to provide "the best and personalized thermal solutions." Its Captain EX series of AIO CPU coolers has what it calls a "Steam Punk" look with visible liquid flow, but what we are most concerned with is just how well it cools our overclocked and over-volted Ryzen 7 processor. And it has "anti-explosion" rubber material.

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Results: Temperatures

Testing will be done on our Ryzen 7 1700 processor overclocked to 3.9 GHz at 1.475 volts. This represents a very high wattage load. The software used for testing will be Prime95 v29.3 with SmallFFTs for the CPU load. We found Prime95 with Small FFTs load to give us repeatable results, as well as being the preferred load testing software for some major hardware manufacturers. FurMark 1.19 will be stressing the GPU in the combined test, and everything will be monitored using HWiNFO 64 v5.57, and AMD's Ryzen Master. You can see our full explanation of system build-out and testing procedure outlined in this article.

We will be performing two, one hour test runs, one with Prime95 only, then a test with Prime95 and FurMark running simultaneously, both inside a closed case. Temperatures from the "tdie" sensor, as well as all hardware thermocouples, and package wattage will be recorded every 5 minutes.

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Here we finally come to the reason as to why we are testing two different coolers in this review. After strapping the Deepcool Captain 240 EX White RGB to our highly overclocked and overvolted Ryzen test rig, it failed to complete even one minute of our CPU-only test. Temperatures reached as high as 101C in as little as 30 seconds before the system became unstable in multiple attempts, as well as multiple TIM installations.

This is something we have never seen before in any of our testing on this system, so we went as far as re-testing the Captain 240 EX White RGB at stock clocks, with our usual 100% fan profile. At stock clocks in a 30 minute test, with an average package power of around 70 watts, the RGB flavored cooler averaged 54.93C over the quick test. Puzzled, we honestly thought we may have received a defective cooler, and reached out to Deepcool for a replacement.

Deepcool happily obliged, however the cooler that was sent to us for replacement was not the RGB variant, but the standard Captain 240 EX White.

Pressing forward we bolted the non-RGB Captain 240 EX White to the test rig, and the results were massively better. The standard Captain 240 EX White performed right on par with other 240mm all-in-one coolers we have tested, averaging 75.6C during the CPU only test. It is worth noting that the Captain was not quite as consistent throughout the test, with a 2.8C swing between the minimum and maximum temperatures we recorded.

During the combined test we saw an average temperature of 80.6C, with an average package wattage of 153.7during the 1 hour test, once again right on par with other 240mm coolers. Consistency was better with a 2.3C variance between minimum and maximum recorded temperatures.

Sound Profile and Loudness

Sound testing is done from a distance of 4 feet from the side window of the case, with case fans at 60% speed which we have found to be just barely audible. With everything turned off and the room completely silent the meter registered a sound level of 39dB(A).

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Just as in our unboxing and overview on page 2, the fans again steal the show for the Deepcool Captain 240 EX White and RGB. While not the most quiet fans we have tested, these move a ton of air, and do so without any hums, buzzing, or rattling. On the Deepcool Captain 240 EX White RGB, we saw a reported pump speed of 2,200 RPM, and a reported fan speed of 1,800 ROM in HWiNFO 64. On the standard Captain 240 EX White, HWiNFO 64 showed a pump speed of 2,100 RPM, and a fan speed of 1,750 RPM.

In both cases the pumps are essentially silent, and both systems measured at 46 db(A) with our BAFX3370 Digital Sound Level Meter. The sound produced from these fans, despite the volume, could actually be described as "gentle." While 100% speed may be a little much for a long period of use, the fans are PWM controllable to dial in the optimal level of sound and cooling for your system.