April 19, 2021


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Redmi K40 series evaluation: what kind of experience is ” All series cup promotion “

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Qualcomm Snapdragon 888, Samsung E4 screen, 120Hz refresh rate, 360Hz sampling rate, These parameters often represent high-end flagships, a comfortable experience, and a longer service life also means a higher start threshold. However, there are always exceptions.

On February 25, Redmi released the K40 series, all of which have been upgraded. The screen, performance, and sound quality have been upgraded, but the price is still very competitive. For example, the K40 Pro equipped with Snapdragon 888 has a starting price of only $430.00

Therefore, for the Redmi K40 series, the “All-Series Cup Promotion” is not only a marketing phrase that is convenient for consumers to understand but also a high-level summary of this series.


This is probably Redmi’s best screen

The most common feature of the Redmi K40 and K40 Pro in the configuration is the same high-quality E4 AMOLED screen, and the high refresh rate and other screen parameters remain the same.

In terms of book parameters, both Redmi K40 and K40 Pro are equipped with a 6.67-inch Samsung E4 AMOLED screen. Compared with the E3 screen material released in 2019, it has a higher peak brightness, up to 1300nit, and a screen contrast of 5000000:1. That means these two phones can still maintain a clear and visible screen display under outdoor sunlight. Therefore, whether from the data or the naked eye, the K40 dual flagships are brighter than the previous generation.

The refresh rate and touch sampling rate are also upgraded. This screen supports a 120Hz refresh rate and the first 360Hz three-finger touch sampling rate. This parameter is even higher than the current game phones on the market and makes this high refresh screen have higher practical significance. In simple words, a 120Hz refresh rate means that the screen refreshes 120 pictures per second, which is more smooth to use. The increase in adoption rate makes the screen handier so that the screen touch can keep up with finger sliding speed. The high refresh rate screen has also become better to control, especially in games that require high-precision operations such as “Glory of the King” and “Peace Elite,” the processes such as aimiing. Skill casting is also more stable and accurate.

120Hz refresh rate + 360hz sampling rate + the current MIUI optimization, Redmi K40 and K40 Pro screen use experience is quite pleasant.  The desktop flipping frame drop problem has been significantly improved, and flipping animation is very smooth.

But there is one thing. When I turned on these two phones for the first time, the two phones’ default refresh rate was 60Hz instead of the main 120Hz. This later needs to be manually turned on by the user. Since the Redmi K40 dual flagship has prepared such a high-quality screen, why not default to 120Hz in one step so that users can directly experience the smoothest state of this screen? If you are worried about power consumption, you can prompt boot settings and let consumers choose the refresh rate.

In addition to the screen as mentioned above material, brightness, refresh rate, sampling rate, and other parameters of these two phones has also been greatly improved. In the color adjustment, the screen JNCD≈0.36, ΔE≈0.35, this color calibration-level has reached the current first-class level and can restore and display the color. Moreover, this time the K40 Pro screen has obtained DisplayMate A+ certification, which is evident in the high screen quality.

Besides, Redmi K40 and K40 Pro provide many color modes and custom adjustment space in the settings-display-color style. Based on my personal experience, switching to another color mode is recommended when you get it or directly select P3 or sRGB in the advanced mode. The color display is much more accurate. The color performance of the default adaptive mode is a bit too gorgeous. At first glance, it is indeed very dazzling and attractive, but it seems exhausted after a long time. It is recommended that the official follow-up adjustment of the color performance of the adaptive mode.

It is worth noting that Redmi K40 and K40 Pro have added a unique feature-True Tone true color display. The mobile phone has a built-in dedicated ambient light sensor, which can detect ambient light color information through multiple internal light channels and adjust the screen color temperature according to different ambient light. The display color temperature is more in line with the ambient color temperature. For example, in the night environment, the mobile phone screen’s color temperature will be significantly warmer, reduce the brightness, and maintain a more comfortable screen look and feel. When you go to another light environment, the screen color temperature will change accordingly.

However, the “cold” and “warm” color temperature of this screen are temporary, aiming to adjust a color temperature suitable for the current environment to make the naked eye feel more comfortable. Also, this function will not cause damage to the screen, and the power consumption caused by this function is almost negligible.

Although there are some minor flaws, these are software problems, which can be improved and corrected later. They do not affect the high quality of the screens on the Redmi K40 and K40 Pro. Moreover, K40 series can use the same high-quality screen at this price and in the same series of mobile phones with different positioning. More consumers can use high-quality and high-standard screens, which shows the sincerity of the K40 series.


Appearance, a little more soft

Redmi K40 and K40 Pro all adopt a top-notch design. The notch is located at the center of the screen’s top. The diameter of the opening is only 2.76mm, which is very small. In contrast, the length of a sesame seed is about 2mm. Under the premise of ensuring the look, feel, and integrity of the body, the impact of tapping on the screen look and overall screen appearance is reduced as much as possible.

In the early warm-up of the K40 series, there was feedback that this phone’s frame was relatively wide. But this is not the case with the real device in hand. The Redmi K40 and K40 Pro have the same frame width, with narrow left and right frames and similar widths on the four sides, so they can maintain a more balanced look and feel visually. Also, as far as the bottom frame is concerned, it is not wide. It appears wide only because of the visual difference caused by the middle frame’s color and the structure. If you are concerned, you can go to nearest store to experience it for yourself.

The highlight on the appearance level this time, in addition to the ultra-small openings, is the color scheme this time. Redmi K40 Pro comes in three colors: Ink Feather, Sunny Snow, and Fantasy Land. The historic Damascus steel knife inspires the ink feather design. After 11 processes and hundreds of attempts, this phone finally combines the characteristics of this steel knife. The unique texture undulates with the flow of light, and this texture also incorporates gradual design elements. The texture color changes from dark to light, gradually extending from the edge of the body to the inside. With the black back cover, it is not intrusive and has high degree of recognition.

Redmi K40 comes in three colors: Bright Black, Sunny Snow, and Fantasy Land. Among them, Sunny Snow and Fantasy Land are the colors shared by the two phones. The former uses AG glass technology to highlight white cleanness and purity, while the latter is mainly blue. The multi-layer film can show dynamic light, shadow, and color effects.

In some details, the camera part and brand logo arrangement of Redmi K40 and K40 Pro adopts a design language similar to Xiaomi 11. Also, both phones are equipped with Dolby stereo symmetrical dual speakers and X-axis linear motors. It is worth noting that the Redmi K40 and K40 Pro’s weight and thickness are 6.9oz and 7.8mm. The built-in 4520mAh battery under the premise of limited space in the body achieves a balance of lightness and battery life, which is worth praising.

Another point is that side fingerprints unlock both phones, and the fingerprint power button is two-in-one. Still, instead of using the traditional groove design, the fingerprint power button’s appearance is the same as that of the ordinary power button, keeping the body of the phone. Functionally, in the settings-more settings, you can add more shortcuts to the fingerprint power button, for example, tap the fingerprint button twice to open the payment code, scan, camera, voice assistant, etc. After receiving OTA updates in the future, It can also expand fingerprints’ application space.

The Redmi K40 and K40 Pro appearance is more recognizable than the previous generation, especially the ultra-small holes, ink feather color matching, and the camera design, which are enough to make people recognize that this is a mobile phone belonging to the K40 series.


Flagship chip, Everyone has a share

The previously released K30 and K30 Pro use the Snapdragon 765G and Snapdragon 865, respectively. This time, the K40 dual flagships all use the Snapdragon 8 series chips that are positioned as flagships. Redmi K40 is equipped with Qualcomm Snapdragon 870, while K40 Pro is equipped with Qualcomm Snapdragon 888 with an advanced 5nm process. The performance is significantly improved compared with the previous generation. Moreover, the K40 series is also Redmi’s first series of products equipped with these two chips.

In the Antutu running points, the Redmi K40 Pro equipped with the Snapdragon 888 has a running score of 727853 points. The Redmi K40 using the Snapdragon 870 has a running score of 631320. The running scores of both have reached the current mainstream flagship level. Still, the Snapdragon 888 with 5nm process technology and Cortex-X1 super core has a higher performance level.

At the CPU level, the Redmi K40 Pro has a single-core score of 5059 points and a multi-core score of 14,919 points, while the K40’s single-core and multi-core scores are 4587 points and 13,362 points, respectively. The CPU part directly determines the performance of a chip. It can be seen that the performance of the two mobile phones has reached the flagship level.

In the GPU part that determines the graphics processing capabilities, the Redmi K40 Pro scored 7477 points in the 3D Mark OpenGL ES 3.1 test, and the K40 scored 6298 points. K40 Pro relies on the Adreno 660 integrated by Snapdragon 888 to obtain very good graphics processing capabilities, which means that K40 Pro can obtain higher game picture quality and more stable game frames in games, especially in high-graphics games.

It is worth noting that both the Redmi K40 Pro and K40 mobile phones support 90 frames of “King of Glory.” Still, relatively, this also puts higher requirements on the mobile phone’s performance. It can be seen from the above two frame number graphs that the average frame number of K40 is 90.5 frames. The overall operation is smooth, but there is a specific frame number fluctuation. In contrast, the average frame number of K40 Pro is 92.5 frames. The running effect is very smooth. The frame number curve is Stable and relies on Snapdragon 888, with better game graphics quality.

In “Peace Elite”, the performance of the two is the same. Under the highest image quality that can be turned on, the frame number curve is stable. The operation runs smoothly. After the entire game experience, there is no frame drop phenomenon.

However, the performance gap between the two will be more evident in “The Original God”, which has a very high mobile phone configuration. Under the premise of the highest image quality and 60 frames, the average frame number of K40 is only 31.1 frames. There are apparent frame drops and freezes, but the smoothness has been restored after reducing the image quality and frame number requirements. On the premise of the highest image quality and 60 frames, the K40 Pro equipped with Snapdragon 888 has an average frame rate of 59.8 frames. The game frame rate is more stable and smooth, there is no evident lag, but the picture is more precise and brighter.

This time, the Redmi K40 series debuts 360Hz three-finger touch and super-resolution touch, which can significantly enhance the game’s sense of operation, and the screen in the game is more user-friendly. Users can customize the hand control and sensitivity in the game acceleration-advanced settings and customize the touch sensor according to their operating habits.

Simultaneously, to further enhance the game’s immersion, the K40 series has been specially optimized for the X-axis linear motor so that the motor vibration is integrated into each use scene, and the interaction is more three-dimensional. Moreover, this vibration has been customized for “Peace Elite”, and every shot, driving and other operations are more realistic.

However, for the improvement of the game and the hardware itself, a stable network connection is also required. Redmi K40 Pro supports WiFi 6 enhanced version and dual 5G dual card dual standby. While bringing faster network speed, it can also effectively reduce game delay. With a Multi-Link 5.0 multi-network parallel connection, WiFi instantaneously cuts 5G network to ensure gaming Always online.

In addition to the chip upgrade, Redmi K40 Pro is equipped with a 3200MHz full-blood version of LPDDR5 memory, with a data transfer rate of up to 6400Mbps. The full blood version of LPDDR5 memory and UFS 3.1 flash memory are paired with Snapdragon 888. The three work together to keep the phone running smoothly. Redmi K40 uses 2750MHz LPDDR5 memory, with a data transfer rate of up to 5500Mbps. It can also achieve high processing efficiency and speed with the Snapdragon 870.

The chip part is one of the upgrade key point of the Redmi K40 series. The entire series is equipped with flagship Snapdragon 8 series chips, which makes the performance of the K40 series significantly improved compared with the previous generation, making it more obvious when facing products at the same price.



In terms of screen, chip, battery life, user experience, and other aspects, the Redmi K40 series has been significantly upgraded, coupled with its highly competitive price. This generation of products has a more obvious cost-effective advantage. At the same time, under the guidance concept of “all series upgrade cups”, K40 has enough strength to take over last year’s K30 Pro, while K40 Pro and subsequent models can let go of their hands and feet to continue to upgrade, and even explore higher price segments, and then Promote the upgrade of the Redmi brand. But at the same time, Redmi will not give up its cost-effective advantage, which is evident from this K40.

Therefore, for the K40 series of the “All series cup promotion,” I think it can be regarded as an attempt by Redmi to develop upwards. Perhaps in the future, we can see that Redmi will have more products and continue to consolidate and improve itself in the industry’s market. There is no doubt that the K40 series can and must make a good start for Redmi’s in new 10-year road.

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