I. Preface: The Redmi K40 family has added another member to inherit the classic and upgrade
To say that the most representative mobile phone in the 2021 2000 yuan file, the Redmi K40 series that has been guarding the door for a whole year, must be nominated.
Excellent Samsung E4 AMOLED flagship direct screen, Snapdragon 870 + LPDDR5 memory + UFS 3.1 flash performance three-piece set, such a quasi-flagship configuration, but also pulled the price to less than 2,000 yuan, even today can also be called "true incense machine", it can be seen how to play.
With the recent release of the Redmi K50 series, the K40 series has also blossomed into new flowers, bringing us a refreshing Redmi K40S, upgrading from four aspects of conscience, and the price is lower, which can be described as "increasing the amount and reducing the price".
Now, we have received a bright black color scheme, 12GB +256GB version of the Redmi K40S.
Since as the "flagship welder", the ultimate stacking is also redmi's tradition, this K40S not only inherits the classic, but also brings a new design.
The flagship AMOLED direct screen of Samsung E4 material, the "performance iron triangle" composed of Snapdragon 870+ LPDDR5 memory + UFS 3.1 flash memory, and the 4500 mAh battery are fully retained.
In terms of upgrading, the first is to bring the same design and color matching as K50, using the most popular straight-edged frame design, and the fuselage is also lighter and thinner.
The rear pixels remain unchanged, but the OIS optical image stabilization missing from the K40 is added, even if many high-end machines of three or four thousand yuan do not necessarily have, it can be guaranteed that the hand shooting also has a very high film completion rate.
At the same time, the liquid-cooled copper tube becomes 3112 square millimeters of VC liquid-cooled heat dissipation, and the area is increased by 400%, which can bring better heat dissipation effect.
Fast charging was also upgraded from 33W to 67W, further shortening the charging time.
Now, let's take a look at the performance of this K40 upgrade - Redmi K40S, the following figure is the specific parameters:
Second, the appearance: the straight edge of the middle frame is very tough, the rear camera shape and the K50 division out of the same door
The front of the Redmi K40S adopts a 6.67-inch Samsung E4 luminous material AMOLED flagship direct screen, with a resolution of 2400×1800, supports 120Hz refresh rate, 360Hz touch sampling rate, a contrast ratio of 5 million:1, supports HDR+, MEMC frame rate compensation, peak brightness is up to 1300nit, global brightness is up to 900nit.
The surface adopts corning's 5th generation Gorilla Glass, which is wear-resistant and drop-resistant, with a screen opening of 2.76mm, and a front-facing camera of 20 million cramms, which supports features such as AI beauty.
The back styling design of the Redmi K40S and the K50 series are the same as the division, and the overall is very simple, with a very distinctive square and round collision design, which is distinguished from the language design of the Redmi K40.
The Redmi K40S rear camera consists of a 48MP main lens + 8 million ultra-wide angle lens + 2 million macros, the entire module is in a two-stage step shape, the lower half is a fill light and 48MP OIS logo.
One of the highlights of the redmi K40S upgrade is the use of a rounded appearance to a trendy small vertical edge design, which looks a lot tougher, but the edges are over-treated with rounded corners, and it does not look awkward when held in the hand.
The physical button is on the right side of the fuselage, the volume plus or minus key on the top, and the power button that supports fingerprint recognition on the bottom.
Top and bottom local details, in addition to the regular USB-C interface and SIM card slot, the Redmi K50 also supports dual speakers and infrared.
The Redmi K40S box comes with a 67W charger.
Third, performance test: Snapdragon 870 stable performance of the quasi-flagship level performance
Redmi K40S is equipped with Qualcomm Snapdragon 870, this processor as a game god U, taking into account power consumption and performance, is one of the most popular chips on the market, and even many tablets are also using it.
This chip specification is based on the 7nm process, the CPU is composed of 1 3.2GHz super core + 3 2.42GHz large core + 4 1.8GHz small cores, and LPDDR5 memory + UFS3.1 flash memory to form a performance three-piece set.
- Ann Rabbit
An Tutu ran a score of 723322 points, which belongs to the performance performance of the regular Snapdragon 870, surpassing 66% of users.
The CPU score is 194831 points, the GPU score is 241428 points, the memory score is 130842 points, and the UX score is 156221 points.
--Master Lu
Master Lu ran out of 844046 points, but more than 99% of mobile phones are a bit exaggerated.
The CPU score is 284593 points, the GPU score is 323309 points, the memory score is 102540 points, and the storage score is 133604 points.
——GeekBench
We chose GeekBench 5, one of the most mainstream processor benchmark software on the market, for testing, giving a score of single-core 1029 and multi-core 3384.
——GFXBench
GFXBench's performance, in terms of achievements, belongs to the performance of the Snapdragon 870 GPU, which is decent.
——AndroBench
In Androbench, the measured sequential read speed is 1578MB/s, which is the performance of UFS 3.1 flash memory
From the above results, the performance difference between The Redmi K40S and K40 is not much, and there is not much room for further digging in the case of the performance tuning of the Snapdragon 870.
Of course, the mature power consumption adjustment level and stable flagship performance release ability of snapdragon 870 also make this chip durable, and it is still the "most fragrant" chip on the market.
Fourth, the game test: 120Hz screen blessing The game experience is silky and smooth
- Ace Warrior
In Ace Warrior, we changed the game's screen quality and frame count to the highest, allowing for automatic reduction in image quality and frame rate off.
During the fast war, the frame rate is basically maintained at 120 frames, which is very stable, excluding the frame rate fluctuations caused by death, and the average frame rate is 115 frames.
——QQ Flying Car
In "QQ Speed", we changed the picture quality setting of the game to ultra-high, the in-game frame rate and the external frame rate to extremely high, the resolution to ultra-clear, and the special effects level to high.
In quick matchmaking multiplayer matches, the overall frame rate is above 122 frames, and although it fluctuates during the period, the average frame rate is also 120 frames.
- The original god
If you want to understand the performance release and tuning ability of the mobile phone, it is most appropriate to use "Original God" to test.
We changed the game image quality to very high quality and the frame rate to 60 frames.
During the Game of Original God, we randomly play monsters and run pictures for 15 minutes in multiple scenes.
After entering the game, the initial frame rate is 55 frames, but as the game gradually heats up, the frame rate gradually decreases further, and the second half is basically stable at 48 frames.
At the same time, we detected through an infrared thermal imager that the temperature of the SoC region of the mobile phone came to about 42 ° C.
The above several mainstream games, the performance of Redmi K40S can run smoothly, but from the experience of "Original God", the game scheduling is slightly conservative, which should be the trade-off between heat and performance of Redmi K40S, it is recommended that players appropriately reduce the picture quality to get the best game experience.
Fifth, the camera effect: IMX582 with OIS optical image stabilization can be taken at hand
The rear camera of the Redmi K40S is composed of 48 million main lens + 8 million 119° ultra-wide angle lens + 2 million macro lens.
Among them, the main camera is Sony IMX582, 1/2" sensor, f/1.79 large aperture, and the K40's missing OIS optical image stabilization has also been completed on the K40S.
Let's take a look at the photo effect of the Redmi K40S:
Main camera 1x
Ultra wide angle 0.6x
In the case of sufficient light, the IMX582 main camera lens with OIS optical image stabilization has obvious advantages, the picture is transparent and bright, and the color performance is more pleasing.
After adding optical image stabilization, it can effectively reduce the blurring of the picture, improve the film completion rate, and no longer be afraid of the "paste" of the photos taken by the hand shake when taking pictures.
However, there is a significant chromatic aberration and white balance inconsistencies in the ultra-wide-angle lens, and it is recommended to use the main camera more.
Although the macro pixels are only 2 million, the advantages are very obvious when photographing small natural scenes such as flowers and green plants, especially the white flower part on the top, the grain, and the flower buds can be shown in a subtle way.
Sample of the night view
In terms of night scenes, Redmi K40 is very well controlled for both neon lights and architectural lights, and can also restore the details and color atmosphere of objects, even in the face of complex text lighting effects can be steadily suppressed, basically no glare.
Of course, it is recommended to avoid strong light and complex light environments when taking photos, otherwise the sample may appear ghosting, halo and other situations.
Sixth, battery life and charging: 67W fast charge only takes 40 minutes to fill the blood
The Redmi K40S was also upgraded from 33W to 67W fast charging, with a single-cell battery of 4500 mAh built-in.
- Charging test
We start charging from 5% charge, charging to 47% in 20 minutes, and then entering the protected charging mode after 80%, the speed is significantly slower, and it takes a total of 40 minutes to fully charge.
- Endurance test
For the battery life, we use a professional battery life test tool - battery dog produced by Fast Technology for testing.
In terms of test items, we selected the limit battery life test, checked all test items including CPU high voltage, CPU multi-threading, AI recognition, picture browsing, video playback, and web browsing, simulated real use scenarios, maximized the restoration of real load, and infinitely close to the real power consumption.
We set the manual 50% brightness, from full blood to shutdown, a total of 8 hours and 02 minutes, which is very much in line with the performance of the Snapdragon 870 model equipped with a 4500 mAh battery
According to the use habits of ordinary users, it is possible to use intermittently for a day without problems.
VII. Summary: Maintain the high level of the quasi-flagship, the newly upgraded Redmi K40S
On the whole, the Redmi K40S can be said to be the "hybrid" of K40 and K50, and still maintains a very high level of "welder" quasi-flagship machine.
In terms of appearance, it is naturally consistent with the design language of K50 but different, and it is also different from K40, and the different shape also brings freshness to consumers.
Although the straight edge shape is adopted, the Redmi K40S hand feeling has also been optimized, and the edge of the fuselage has been over-processed with rounded corners, which will not be used in the hand, which is still very comfortable.
What is even more rare is that in the case of changing the shape, the Redmi K40S fuselage is only 7.7mm thick and weighs only 195g, which is even slightly thinner and lighter than the K40.
Snapdragon 870 + LPDDR5 memory + UFS 3.1 flash memory quasi-flagship performance naturally needless to say, although the chip tuning is slightly conservative, but the performance and power consumption of the Snapdragon 870 are witnessed.
As the most popular chip on the market, coupled with 3112 square millimeters of VC liquid cooling heat dissipation, even if users play games with higher loads such as "Original God", the chip area is only 42 degrees Celsius, which controls the fuselage within a reasonable range and allows players to play games more permanently.
Redmi K40S is also one of the few models that adopts a high-quality AMOLED flagship direct screen, which can enhance the gaming experience with 120Hz high brush and 360Hz touch sampling rate, and also supports Dolby Vision and HDR10+ high dynamic range display, with Dolby Atmos dual speakers. In the game or film and television experience, this Redmi K40S can bring users excellent visual enjoyment.
OIS optical image stabilization is a surprise in surprises, not to mention the same grade mobile phones on the market, and even more high-end products are rare, the actual experience whether day or night, whether it is a long-range or macro, do not have to worry about hand shaking.
There is also an upgraded 67W fast charge, which can charge 50% of the 4500 mA battery in 10 minutes, full blood in 40 minutes, and provide 8 hours of use time under high load.
It can be said that redmi K40S has no shortcomings in screen, performance, photography, fast charging and other aspects, and it is cheaper after upgrading, only 1799 yuan, no wonder it is out of stock as soon as it is sold, and the praise rate is 100%. Such a god-level cost performance, what are you waiting for?