| Battery life |
Introduction CPU và System Performance GPU & Gaming Performance Battery Life & Thermal Stability Final Words
As a thành viên of Xiaomi’s more affordable Redmi series, the cảnh báo 4 does not have a curved screen, a ceramic body, or the latest flagship hardware like 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, and battery life. Bạn đang xem: Xiaomi redmi note 4 review We previously reviewed Xiaomi's Redmi lưu ý 3 Pro, the international version with a Qualcomm Snapdragon 650 So
C. Its big.LITTLE combination of two Cortex-A72 & four A53 CPU cores delivered excellent performance well above its low-priced competitors & their octa-core A53 So
Cs. 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 Snapdragon 650 with a large 4050m
Ah battery also gave the Redmi note 3 Pro good battery life, with 12 hours of screen-on-time in our Wi-Fi browsing test.  Like previous Notes, the Redmi cảnh báo 4 comes in two different versions. The international version comes with a Snapdragon 625 So
C, an octa-core A53 configuration built on the 14nm LPP Fin
FET process with all eight cores reaching up to 2.0GHz. We'll be taking a look at the Chinese version, however, which comes with a Media
Tek Helio X20 So
C and three different memory/storage configurations: 3GB/64GB, 3GB/32GB, và 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 micro
SD cards for storage expansion, though. The Helio X20 version’s software is also specific khổng lồ China, with preinstalled apps that cater khổng lồ 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 khổng lồ differ in performance as well as features, catering to the demands of local users. | Xiaomi Redmi note 4 Series | | Xiaomi Redmi cảnh báo 4(China) | Xiaomi Redmi note 4(International) | So
C | Media
Tek Helio X20(MT6797)2x Cortex-A72
2.0GHz
Adreno 506 | | Display | 5.5-inch 1920x1080 IPS LCD | | Dimensions | 151.0 x 76.0 x 8.35 mm175 grams | 151.0 x 76.0 x 8.45 mm165 grams | | RAM | 3GB / 2GB LPDDR3-1866 | 4GB / 3GB / 2GB LPDDR3 | | NAND | 64GB / 32GB / 16GB (e
MMC 5.0)+ micro
SD | 64GB / 32GB (e
MMC 5.0)+ micro
SD | | Battery | 4100 m
Ah (15.79 Wh)non-replaceable | | Modem | Media
Tek (Integrated)2G / 3G / 4G LTE (Category 6)FDD-LTE / TD-LTE / TD-SCDMA / WCDMA / CDMA / GSM | Snapdragon X9 LTE (Integrated)2G / 3G / 4G LTE (Category 7/13)FDD-LTE / TD-LTE / WCDMA / GSM | | SIM Size | Nano
SIM + Micro
SIM (dual standby) | | Wireless | 802.11a/b/g/n/ac, BT 4.2, Ir
LED, GPS/Glonass/BDS | 802.11a/b/g/n, BT 4.1, Ir
LED, GPS/Glonass/BDS | | Connectivity | micro
USB 2.0, 3.5mm headset | | Launch OS | Android 6.0 with MIUI 8 | | Software Version Tested | Android 6.0MIUI 8 (6.12.22) | - |
The Media
Tek Helio X20 stands out for being the first So
C 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 & improve overall responsiveness. The Mid cluster uses 4 A53 cores with a max operating point of 1846MHz that consume less power nguồn than the more complex A72 cores but still offer a reasonable level of performance for common workloads. The Min cluster also contains 4 A53 cores but they only ramp up khổng lồ a max frequency of 1391MHz, and are intended for light workloads or background tasks where power nguồn efficiency is more important than performance. Xem thêm: Hệ Thống Cửa Hàng Lime Orange Official Store, Lime Orange Trường Chinh It’s best to lớn think of the three CPU clusters like gears in a car. If you want to go faster or need more torque because a heavy load is placed on the engine, like climbing a hill, you select a different gear. Likewise, when you’re just cruising down the freeway at a constant speed, you shift into overdrive to maintain your speed và improve fuel efficiency. Media
Tek’s Core
Pilot 3.0 software is responsible for selecting the right gear, its scheduler shifting threads between CPU clusters and working with the CPUFreq framework khổng lồ adjust CPU frequency khổng lồ achieve the right balance between performance and power consumption. Core
Pilot increases the sampling rate for adjusting CPU frequency, a method it calls Fast DVFS, so the system can respond more quickly lớn changes in load.  Core
Pilot also includes a feature called i
Core that modifies the kernel’s CPU hotplug mechanism. A system always needs at least one CPU active khổng lồ handle critical tasks lượt thích interrupt handling and running the operating system. By mặc định the Linux kernel reserves CPU0 for this task, which in the case of the X20 is the first physical CPU in the Min cluster; however, keeping CPU0 & its cluster active at all times unnecessarily increases power consumption for the X20’s tri-cluster design. The i
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 khổng lồ power down when not needed.  The Helio X20 uses Media
Tek’s Coherent System Interconnect (MCSI) khổng lồ provide hardware-based cache 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 Media
Tek’s tri-cluster approach. Its Helio X25 So
C is the same as the X20, but uses higher peak frequencies (2.52GHz / 2.00GHz / 1.55GHz) for the Max, Mid, và 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 like 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 Core
Pilot’s load threshold values to allow proper thread migration, which we noticed after retesting the Pro 6 with Flyme OS 5.2.5.0G. If anything, this experience highlights the important role OEMs play in tuning the software parameters that control a device’s CPU scheduling và DVFS systems, customizing the balance between performance and power consumption. Now it’s time to see how the xiaomi mi Redmi lưu ý 4 và its Helio X20 So
C fare in our performance và battery life tests. Will it utilize its big cores effectively và be able to lớn match the performance of the Redmi chú ý 3 Pro & other, higher-cost phones? Will its large 4100m
Ah battery keep it chugging along or will So
C or display inefficiencies reduce battery life? How will its scores compare to the updated results for the Meizu Pro 6 và its higher clocked X25 So
C?
CPU và System Performance Introduction CPU và System Performance GPU và Gaming Performance Battery Life & Thermal Stability Final Words
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