Xiaomi redmi note 4 pro helio x20 3gb 64gb smartphone

Introduction CPU và System Performance GPU và Gaming Performance Battery Life và Thermal Stability Final Words

As a thành viên of Xiaomi’s more affordable Redngươi series, the cảnh báo 4 does not have sầu a curved screen, a ceramic body toàn thân, or the lademo flagship hardware lượt thích Xiaomi’s more expensive models, but it does pack a 5.5-inch IPS LCD display, a rear-mounted fingerprint sensor, và a 13MP camera with PDAF into a solid-feeling aluminum chassis. This report is more concerned with its internal hardware, however, focusing on the Redmi chú ý 4’s system performance, gaming performance, & battery life.

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We previously reviewed Xiaomi's Redmi cảnh báo 3 Pro, the international version with a Qualcomilimet Snaprồng 650 SoC. Its big.LITTLE combination of two Cortex-A72 & four A53 CPU cores delivered excellent performance well above its low-priced competitors and their octa-core A53 SoCs. While the lower-power, in-order A53 core performs well enough over a range of light lớn moderate workloads, it falls far short of its bigger brother when dealing with more complex tasks such as rendering Web pages. Pairing the SnapLong 650 with a large 4050mAh battery also gave sầu the Redmày Note 3 Pro good battery life, with 12 hours of screen-on-time in our Wi-Fi browsing test.


Like previous Notes, the Redmày lưu ý 4 comes in two different versions. The international version comes with a Snapdragon 625 SoC, an octa-core A53 configuration built on the 14nm LPPhường FinFET process with all eight cores reaching up lớn 2.0GHz. We'll be taking a look at the Chinese version, however, which comes with a MediaTek Helio Xtrăng tròn SoC & three different memory/storage configurations: 3GB/64GB, 3GB/32GB, & 2GB/16GB. The international version tops out at 4GB/64GB, retains the 3GB/32GB configuration, và offers more internal storage in the base model at 2GB/32GB. Both versions tư vấn microSD cards for storage expansion, though.

The Helio Xđôi mươi version’s software is also specific to China, with preinstalled apps that cater to lớn this market, some of which stand in for Google apps and services that are not installed by default. It's also not uncommon for region-specific ROMs to differ in performance as well as features, catering to the demands of local users.

Xiaomi Redmày lưu ý 4 Series
Xiaomi Redmi Note 4(China)Xiaomi Redmày Note 4(International)
SoCMediaTek Helio X20(MT6797)2x Cortex-A72
2.0GHzAdreno 506
Display5.5-inch 1920x1080 IPS LCD
Dimensions151.0 x 76.0 x 8.35 mm175 grams151.0 x 76.0 x 8.45 mm165 grams
RAM3GB / 2GB LPDDR3-18664GB / 3GB / 2GB LPDDR3
NAND64GB / 32GB / 16GB (eMMC 5.0)+ microSD64GB / 32GB (eMMC 5.0)+ microSD
Battery4100 mAh (15.79 Wh)non-replaceable
ModemMediaTek (Integrated)2G / 3G / 4G LTE (Category 6)FDD-LTE / TD-LTE / TD-SCDMA / WCDMA / CDMA / GSMSnapdragon X9 LTE (Integrated)2G / 3G / 4G LTE (Category 7/13)FDD-LTE / TD-LTE / WCDMA / GSM
SIM SizeNanoSIM + MicroSIM (dual standby)
Wireless802.11a/b/g/n/ac, BT 4.2, IrLED, GPS/Glonass/BDS802.11a/b/g/n, BT 4.1, IrLED, GPS/Glonass/BDS
ConnectivitymicroUSB 2.0, 3.5milimet headset
Launch OSAndroid 6.0 with MIUI 8
Software Version TestedAndroid 6.0MIUI 8 (6.12.22)-

The MediaTek Helio X20 stands out for being the first SoC to lớn use 10 CPU cores arranged in a Max.Mid.Min tri-cluster configuration. The Max cluster contains 2 A72 cores that provide a burst of performance for heavier tasks and improve sầu overall responsiveness. The Mid cluster uses 4 A53 cores with a max operating point of 1846MHz that consume less power than the more complex A72 cores but still offer a reasonable cấp độ of performance for comtháng workloads. The Min cluster also contains 4 A53 cores but they only ramp up lớn a max frequency of 1391MHz, & are intended for light workloads or background tasks where power efficiency is more important than performance.

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It’s best lớn think of the three CPU clusters lượt thích gears in a car. If you want to go faster or need more torque because a heavy load is placed on the engine, lượt thích climbing a hill, you select a different gear. Likewise, when you’re just cruising down the freeway at a constant speed, you shift inkhổng lồ overdrive to lớn maintain your tốc độ và improve sầu fuel efficiency.

MediaTek’s CorePilot 3.0 software is responsible for selecting the right gear, its scheduler shifting threads between CPU clusters and working with the CPUFreq framework lớn adjust CPU frequency to lớn achieve sầu the right balance between performance & power consumption. CorePilot increases the sampling rate for adjusting CPU frequency, a method it calls Fast DVFS, so the system can respond more quickly to lớn changes in load.


CorePilot also includes a feature called iVi xử lý Core that modifies the kernel’s CPU hotplug mechanism. A system always needs at least one CPU active lớn handle critical tasks lượt thích interrupt handling và running the operating system. By mặc định the Linux kernel reserves CPU0 for this task, which in the case of the Xtrăng tròn is the first physical CPU in the Min cluster; however, keeping CPU0 and its cluster active sầu at all times unnecessarily increases power consumption for the X20’s tri-cluster kiến thiết. The iChip Core feature solves this problem by migrating the tasks statically assigned to lớn CPU0 lớn a CPU in the Mid cluster, allowing the Min cluster lớn power down when not needed.


The Helio Xđôi mươi uses MediaTek’s Coherent System Interconnect (MCSI) to provide hardware-based cabịt coherence, enabling faster thread migration between CPU clusters. The 2x32bit 933MHz LPDDR3 memory interface cannot provide the same amount of bandwidth as the LPDDR4 memory systems in current flagship phones, but it should be sufficient for the modest Mali-T880MP4 GPU.

Until now, the Meizu Pro 6 was the only device we tested that employed MediaTek’s tri-cluster approach. Its Helio X25 SoC is the same as the Xđôi mươi, but uses higher peak frequencies (2.52GHz / 2.00GHz / 1.55GHz) for the Max, Mid, and Min CPU clusters, respectively. Unfortunately, the Meizu Pro 6 performed poorly in our initial tests. A closer analysis revealed that the Pro 6 was not migrating threads to lớn its two A72 cores under heavier loads like it should, effectively behaving & performing more lượt thích a device with an octa-core A53 CPU arrangement. While it’s unfortunate that Meizu would ship a hàng hóa in this condition, it did eventually adjust CorePilot’s load threshold values lớn allow proper thread migration, which we noticed after retesting the Pro 6 with Flyme OS If anything, this experience highlights the important role OEMs play in tuning the software parameters that control a device’s CPU scheduling and DVFS systems, customizing the balance between performance and power consumption.

Now it’s time to lớn see how the Xiaongươi Redmày cảnh báo 4 & its Helio Xtrăng tròn SoC fare in our performance and battery life tests. Will it utilize its big cores effectively & be able to match the performance of the Redmi chú ý 3 Pro and other, higher-cost phones? Will its large 4100mAh battery keep it chugging along or will SoC or display inefficiencies reduce battery life? How will its scores compare to lớn the updated results for the Meizu Pro 6 và its higher clocked X25 SoC?

CPU & System Performance Introduction CPU và System Performance GPU và Gaming Performance Battery Life và Thermal Stability Final Words