Summer is just around the corner and the weather is starting to heat up. Currently, the daytime temperature has already reached 30°C. Without active cooling assistance, prolonged gaming in high-temperature environments can easily cause mobile devices to overheat, resulting in thermal throttling and frame drops, making it difficult to enjoy gaming with friends. Occasional stuttering is tolerable, but a hot phone surface is unbearable. The Red Magic 4 Pro Back Clip version of the cooling fan adopts a hardcore mecha-style shell design with an RGB dynamic lighting effect. It features a customized TEC semiconductor cooling plate with a peak power of 27W. Let's test its actual cooling effect in detail.

The package box contains the Red Magic 4 Pro Back Clip cooling fan, a power cable, and a manual. The power cable uses a USB-C to USB-C interface, with a length of about one meter and a black TPE material exterior. The wire is soft and flexible and can transfer up to 60W of power, more than enough to power the cooling fan.

The Red Magic 4 Pro Back Clip cooling fan adopts a hardcore mecha-style design with a sharp and rugged appearance. The shell is made of PC plastic material with a cool pure silver coating and a unique touch. The center features a hollow air intake design with a concentric circle design with the Red Magic logo above it.

Located in the lower left corner of the body's front is the operating gear control button. The Red Magic 4 Pro Back Clip cooling fan has four different operating gears that can be cycled through. When connected to a power source, it will operate at the highest gear. Players can switch to different gears according to the game scene. If quiet operation is required, the operating gear can be appropriately lowered.

The air outlet is designed on both sides of the body, and the hot air is discharged without blowing directly onto the fingers. The bottom of the body is a USB-C power interface. The peak power of the Red Magic 4 Pro Back Clip cooling fan is 27W, compatible with mainstream fast charging protocols such as PD and Qualcomm QC. If you want the cooling fan to perform at its best, you need to use a charger or mobile power bank that supports 9V/3A or higher.

The inner surface is covered with a layer of thermal silicone pad, which is soft to the touch and avoids scratching the phone case. The Red Magic 4 Pro Back Clip cooling fan uses Red Magic's fourth-generation semiconductor cooling technology, with a customized TEC semiconductor cooling plate and an aluminum alloy heat sink. The manufacturer claims a maximum cooling of 32°C with no load. We will test its actual cooling effect later.

The Red Magic 4 Pro Back Clip cooling fan is equipped with a seven-blade high-speed cooling fan with a maximum speed of 4500RPM, quickly expelling internal heat. The body also has a cool RGB dynamic lighting effect. The light mode and brightness are not adjustable, but the soft light and color changes create an immersive gaming atmosphere.

The manufacturer claims that the peak operating power of the Red Magic 4 Pro Back Clip Edition cooler can reach 27W. Actual tests showed that when operating in the highest gear mode after startup, the operating power can indeed reach 27W for a short time, but later it will decrease and stabilize at around 25W. If switched to the lowest gear mode, the operating power will be close to 9W.

In fact, the Red Magic 4 Pro Back Clip Edition cooler does not require high power supply equipment. Common chargers that support 5V/2A output can also power it, but the cooling performance will be significantly discounted. If you want to use it in outdoor scenarios, it can be used with a compatible PD or QC fast charging protocol mobile power source and adjust the gear mode appropriately to extend the battery life.

Next, we tested the idle cooling effect of the Red Magic 4 Pro Back Clip Edition cooler. The ambient temperature during testing was 28°C. The surface temperature was measured using an infrared thermometer after continuous idle operation for five minutes in the highest gear mode, and it was found to be 2.6°C. The temperature drop was close to 25.4°C, and only water droplets condensed on the surface. At this 28°C temperature, it will not frost, and the surface will only frost when the air conditioning is turned on and the temperature drops to 19°C.

The Red Magic 4 Pro Back Clip Edition cooler supports holding mobile devices with a width of 68-90mm, and basically, most of the mobile phones on the market can be installed. If you want to install mobile devices with wider body sizes, such as tablet computers, you can choose the Red Magic 4 Pro Magnetic Edition and use it with magnetic accessories without width restrictions.

The body size of the Red Magic 4 Pro Back Clip Edition cooler is 86×60×41mm, and the weight is only 105g. Both the upper and lower components of the clip can be moved, and the clip angle can be adjusted according to actual needs. Installing and removing mobile devices is effortless. The inner side is designed with anti-slip silicone, and the grip of the clip is very stable, making it not easy to shake when held in the hand.

The width of the cooling back clip is acceptable, and it will not occupy too much space when installed on a mobile phone. It will not block the hands when holding the phone, and the middle finger and ring finger are only slightly bent. Generally speaking, the motherboard of the phone is located on the side of the camera. During installation, it is best to make the cooling back clip closer to the motherboard or other heat sources to maximize the cooling effect.

The current test was performed on a smartphone equipped with the Qualcomm Snapdragon 865 chip, with a temperature threshold of 66℃ for the temperature wall. When the chip temperature reaches the threshold, it will trigger forced frequency reduction to control the temperature. This temperature threshold is quite conservative, as some models have a temperature threshold of 70℃ or higher. In the double baking pressure test, the temperature wall was triggered after only 50 seconds of operation. However, after using the heat-dissipating back clip, there was no frequency reduction throughout the entire process, and the difference in values ​​can be seen between the maximum, average, and current values was not significant.

The above pressure test belongs to an uncommon use case, as who bakes their phone? Next is the test of the cooling effect of the heat-dissipating back clip in a gaming scenario. The popular game "King of Glory" was skipped, and the mobile game "Peace Elite" was chosen, with the game screen set to HDR high-definition and maximum frame rate mode. In passive heat dissipation mode, when running for five minutes, the temperature wall was triggered, and the CPU entered the frequency reduction state. A large core went into hibernation, and three large cores also entered the frequency reduction state. Relying on four small cores and three half-frequency large cores, the frame rate was maintained at 60FPS indoors, but immediately experienced frame drops when encountering driving or fighting scenes.

When paired with the Red Magic cooling fan 4 Pro back clip, the game frame rate was basically maintained at 60FPS, and the core temperature was around 50℃. In the later stages of the game, driving and fighting scenes are frequently encountered, with some slight frame drops occurring in the room area's three-car and four-team battle scene, with the lowest dropping to 55 frames. The gaming experience was basically unaffected.

Under active heat dissipation conditions, there is no problem running "Peace Elite" at full frame rate on a mobile phone. Next, another popular game, "Genshin Impact," which is a benchmark for mobile phone performance testing, was tested. It tests the overall hardware performance of the phone and generates more heat. The game screen quality was set to the preset ultra-high mode, and the game frame rate was manually changed to 60 frames.

Under passive heat dissipation, the phone entered the frequency reduction state after entering the game scene. As seen in the CPU frequency curve, it struggled repeatedly during the game, and the large core also lasted at least two minutes. The frame rate in the game scene was almost unstable, with the only time full frames were achieved was during team configuration. Frame drops would occur as soon as the game scene was entered.

When paired with the Red Magic cooling fan 4 Pro back clip, the "Genshin Impact" game was run continuously for eight and a half minutes, starting near Liyue Harbor, with an average frame rate of 58.9FPS. The CPU frequency curve showed that the four small cores and three large cores were running at full frequency, and the large core was called upon very actively. The core temperature was around 60℃, and the GPU usage was above 90%.

The RedMagic 4 Pro Back Clip Cooler features a hardcore mecha-style design with added RGB dynamic lighting effects that enhance its gaming and esports attributes. The device's size and weight are controlled properly, and when attached to a mobile phone, it does not add much burden. The cooler employs a wind tunnel design with middle intake and upper and lower side exhausts to avoid hot air blowing onto the fingers, increasing comfort.

The back clip cooler is equipped with RedMagic's fourth-generation semiconductor cooling technology, with a custom TEC semiconductor cooling chip built in, along with an aluminum alloy heat sink and high-speed cooling fan. At the highest operating level, the noise is acceptable, and for games that require sound positioning, such as "Peace Elite," the gear can be appropriately lowered to reduce operating noise. Actual testing has shown that its cooling performance is quite remarkable, with a temperature drop of nearly 25.4℃ in the unloaded state. The cooler is equally effective in reducing the temperature of a mobile phone during use, and even during gameplay like "Genshin Impact," the phone's internal temperature remains stable, without frame drops or stuttering. The back clip cooler assists the phone in fully utilizing its hardware capabilities and provides a noticeable improvement in gaming stability.