The "low frame rate" on PCs and hosts is already considered high on mobile phones，There are not many mobile phones that can run 90 frame games。but，3iQOO Neo5 released on March 16，Achieved 90 frames of multiple games，even 120 frames。Behind this is the combination of Snapdragon 870+ independent display chips。
How the dual cores work together to increase the frame rate。The improvement of the game experience by high frame rate is very easy to understand。give a simple example，If you draw a standing person on a notebook (copy model)，Draw the fully seated pose on the next page，when you quickly flip through these two pages，don't feel anything。But if you draw the standing pose on the first page，in the second、On the third and subsequent pages, draw the person sitting down，One page one squat lower than one page，sat down completely until the last page。Then you turn the page quickly，can find a continuous、smooth animation。The act of drawing a transition action between the first page and the last page is equivalent to increasing the "frame rate"。
There are two ways to increase the frame rate，One is a simple and rude approach on PCs and hosts - directly increase GPU performance。However, PCs and hosts do not need to worry about the size of mobile phones、Heat and battery life limitations，So this approach is not suitable for mobile phones at the current level of technology。
So we need the second method：insert frame。frame insertion is popular on tv，Because most of the TV signals broadcast on TV、The source images of online videos do not have a high frame rate，The GPU cannot compensate for the low frame rate of the source picture。
Frame interpolation has the same purpose as GPU direct rendering，But the way to achieve the goal is different。Combining with the previous example of "people sitting down"，GPU is to "copy" (render) the actual picture of the person (model) sitting down，But interpolation does not use GPU，Instead, use another chip，There is no need for the model to actually do the action and copy it，Directly "imagine" (estimate) what a person should look like between standing and sitting，then draw it，Therefore, it has the ability to achieve high frame rate without consuming GPU computing power。
The GPU in the Snapdragon 870 SoC of iQOO Neo5 will first render a certain frame rate，Then the independent display chip takes over the work，Insert estimated frames between every two frames，Improved screen fluency，Reduced GPU burden。while playing games，GPU is a big consumer of power and heat in mobile phones，Therefore, reducing the burden on the GPU will reduce the temperature of the surrounding body and the power consumption of the whole machine.。
Improvement of fluency in actual games。When we open a game that is compatible with an independent graphics chip，When you pull out the game "toolbox" that comes with the system from the upper left corner of the screen, you can find the option "Game Insertion"。This option includes two interpolation modes："90 frames" and "120 frames"。
The frame insertion of iQOO Neo5 is to insert a frame between every two frames，So if you want to achieve 90 frames after frame interpolation，The GPU only needs to render 45 frames。The remaining 45 frames can be handed over to the independent display chip。If you choose "120 frames"，still the same principle，It's just that the "workload" of the GPU and the independent display chip has become 60 frames。However, it should be noted that，Want to successfully activate the interpolation effect，The screen settings in the game itself must reach 60 frames or above。
Regardless of the number of frames actually rendered by the GPU，The fluency we finally see with the naked eye，It all depends on the fluency of the inserted frame。So when you select "90 FPS" or "120 FPS" in the "Game Frame Insertion" function，The game does get smoother。certainly，This fluency improvement has different effects on different games，Different scenes of the same game have different effects，Even different people are sensitive to this change in fluency differently。
The first is a comparison of a group of "Original God"，pay attention to the ground、stone wall and background forest：The first one is the slow-motion playback after turning on the "120 frames" frame interpolation；The second picture is the picture with the frame interpolation turned off (the frame rate in the game is set to 60 frames)，The second card is obviously more；The third picture has "90 frames" interpolation enabled，The fluency is between the previous two pictures。
Next is the comparison of "Call of Duty Mobile Games"，Note the texture of the brick wall：
In "Call of Duty Mobile Games"，If there is no frame insertion, the wall picture will be very stuck。This type of shooting game does not have the interface of dialogue or reading a lot of text like "Yuanshin".，The game is almost full of dynamic screen，Interpolation is more useful here。
The example of "Perfect World" is also more obvious，Disable frame insertion，The game ground is card by card。
From these three sets of examples, it is not difficult to find that，The frame insertion effect is more obvious when there are objects moving at high speed in the screen，The more complex the texture of the moving object、larger area，The more obvious the effect。
Improved frame rate stability in actual games。There is no doubt about the improvement of visual fluency，Then the independent display chip reduces the burden on the GPU，Can the stability of the frame rate be improved? To verify this question，We tested it with Call of Duty Mobile and Perfect World，Compared the frame number curve after 90 frames without frame insertion and frame insertion。
The first is "Call of Duty Mobile Games"，In the first scene (man-machine battle snow map)，The frame number stability after interpolation is much stronger than that without interpolation，Almost eliminated small jumps on the frame rate curve。Moreover, the frame rate variance has dropped from "0.4 frames" without interpolation to "0 frames" with 90 frames interpolation。Frame rate variance is a measure of frame rate instability，The higher the game, the more stuck。
In the second scene of "Call of Duty Mobile Games" (man-machine battle yacht map)，the same thing happened。The frame rate curve after interpolation is more stable，The frame rate variance also dropped from "0.1 frame" to "0 frame" due to frame interpolation。
And then "Perfect World"，The same is to take two scenes，The first scene is to keep killing piranhas in the novice area。The stability of the frame number curve is greatly improved after frame insertion，Frame rate variance dropped from "2.6 fps" without interpolation to "0.9 fps" with interpolation。
Everyone, please ignore that there are both interpolated frames and non-interpolated frames，And there are three frame rate drops with almost the same rhythm，This is a game optimization problem，It has nothing to do with inserting frames。
Finally, the process of "Perfect World" automatically finding its way from the first resurrection point (without touching the perspective) back to Novice Village。after interpolation，The frame rate curve is more stable，The frame rate variance has dropped from "8.6 frames" to "1 frame"，The feeling of stuttering is greatly reduced。
Changes in SoC load and heat generation in actual game pools
Because the frame insertion of iQOO Neo5 can only take effect after the original frame rate in the game reaches 60 frames。Interpolating 90 frames is equivalent to only letting the GPU be responsible for 45 frames of tasks。Compared with the 60-frame task without frame insertion，The load on the GPU is definitely reduced。As the GPU load decreases，The CPU packaged with it in an SoC also gets a reduction in usage and temperature。
Inside the first scene of Call of Duty Mobile，After turning on frame insertion，CPU usage (normalized) and temperature decreased by 1.9% and 0.6 degrees C respectively；in the second scene，CPU usage (normalized) and temperature decreased by 1.6% and 1.4 degrees Celsius respectively。
That is to say，An independent display chip will not only reduce the burden on the GPU，Also reduces CPU load。
In order to understand the change of body temperature，We tested a total of 4 hours of "Call of Duty Mobile Games" "Battlefield Legend" mode (eating chicken) and "Perfect World" killing piranha scene。
After playing 1 hour of non-interpolated frame mode and 1 hour of interpolated frame mode, we found that，Turning on frame interpolation in "Call of Duty Mobile Games" reduces the maximum temperature on the back of the phone by 2 degrees Celsius，The minimum temperature dropped by 4.7 degrees Celsius，The average temperature dropped by 2.4 degrees Celsius。The gap between these numbers is very critical for the temperature control of mobile phones，Players can clearly feel the difference in temperature from the feel when holding it。
Perfect World's results are also trending down，From not interpolating frames to turning on the "90 frames" option，1After hours of gaming, the maximum temperature on the back of the phone dropped by 0.7 degrees Celsius，The minimum temperature dropped by 0.9 degrees Celsius，The average temperature dropped by 1.4 degrees Celsius。
Additional Picture Color and Light Enhancements
In addition to the various frame rates and energy consumption related content mentioned earlier，The independent display chip of iQOO Neo5 also has a skill to make the color and light of the game screen look better，That is, "game visual enhancement"，Will convert SDR picture to HDR-like picture。
After turning on "Game Visual Enhancement"，The clarity of the picture has been greatly improved，The font changes on the container are very noticeable，Colors also become more transparent，There is no feeling of "covered by a layer of white fog"。
The changes to the screen by "game visual enhancement" are also reflected in the vegetation，Grass textures are clearer，Green is also brighter。
except color、Clarity and picture transparency，Enhanced game visual effects can also optimize lighting effects，For example, the outline of leaves in the dark grass in the picture below is more obvious，Improved the player's ability to identify objects in dark places。
Is the mobile phone finally entering the era of high frame rate?
Although there is no space for PC/host to play，However, iQOO Neo5 still achieves a high frame rate experience for some games through the dual-core combination of an independent display chip and Snapdragon 870。This is definitely good news for current mobile gamers，Not only can you buy mobile phones that play games with high frame rates，You don't need to spend the "high-end" price of such high-performance mobile phones in the past。
certainly，iQOO Neo5 is also of great significance to the development of future mobile games。The independent display chip itself will continue to improve，Its success will also allow more game developers to optimize for this technology，Bring a better gaming experience。I hope that the day when high frame rate mobile games become popular will not make us wait too long。
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