Xiaomi Mi9: What processor is used and why the Snapdragon 855 was revolutionary

The flagship smartphone Xiaomi Mi9, released in 2019, is still a hot choice for many users. One of the key components that determines its performance is the processor. In this article, we will discuss in detail which chipset is installed in the Mi9, what technologies it supports and how it affects the operation of the device in 2026.

Xiaomi Mi9 was the first in the lineup to receive Qualcomm’s top-end processor, the Snapdragon 855. Not only did it deliver high performance, but it also laid the groundwork for many innovations, such as 5G support (in modifications), improved image processing and energy efficiency. But over time, questions have arisen: how does the Snapdragon 855 cope with modern tasks? Should I buy the Mi9 today? Let’s figure it out.

Official characteristics of the Xiaomi Mi9 processor

The Xiaomi Mi9 is equipped with an 8-core Qualcomm Snapdragon 855 (SM8150) processor built on a 7-nm process. This chipset became the flagship solution for Android devices in 2019 and offered a significant performance gain compared to its predecessor, the Snapdragon 845.

Key features of the Snapdragon 855 in the Mi9:

• 🔹 Central Processing Unit (CPU): 1 Kryo 485 Gold core (Cortex-A76) with frequencies up to 2.84 GHz, 3 Kryo 485 Gold cores up to 2.42 GHz and 4 Kryo 485 Silver cores (Cortex-A55) up to 1.8 GHz.
• 🎮 Graphics Processor (GPU): Adreno 640 with Vulkan 1.1 support, OpenGL ES 3.2 and hardware ray tracing acceleration.
• 📱 Modem: Snapdragon X24 LTE (up to 2 Gbps per download), but without built-in support 5G (in Mi9 it is not even in the modifications).
• 🤖 Artificial Intelligence: 4th generation Qualcomm AI Engine with up to 7 trillion operations per second.
• 📷 Image processing: Spectra 380 ISP with support for 48MP cameras, video recording 4K HDR and hardware acceleration for Google Camera.

Importantly, the Xiaomi Mi9 didn’t get a modification with the Snapdragon 855+ (which came out later and had increased frequencies), so its performance remained at the base version of the chipset.However, even today, the SD855 is able to handle most everyday tasks, including running modern games on medium settings.

Comparison of Snapdragon 855 with competitors of 2019

In the year of release, the Xiaomi Mi9 competed with other flagships equipped with alternative chipsets. Let’s see how the Snapdragon 855 compared with the main rivals:

As you can see from the table, the Snapdragon 855 in the Mi9 performed some of the best benchmarks on Android smartphones. However, the Apple A12 Bionic still outperformed it in single-core performance, which was typical of Apple chipsets of the time. Among Android competitors, the SD855 stood out for higher core frequency and better optimization for games.

⚠️ Warning: In 2026, the performance of the Snapdragon 855 in games like Genshin Impact or Call of Duty Mobile at maximum settings will be limited due to lack of video memory and heat generation.

How to check the processor on your Xiaomi Mi9

If you’re in doubt about which processor your Xiaomi Mi9 has installed (for example, you suspect a chipset switch), it can be easily identified in a number of ways:

1. Through phone settings: Go to Settings → About Phone → Full Specification → Processor. There should be a Qualcomm Snapdragon 855 model specified.
2. Using the CPU-Z app: Download the utility from Google Play, open it and go to the SoC tab. The Model bar will specify the exact chipset.

Make sure that the settings are Snapdragon 855|

Verify the data in CPU-Z with official specifications |

Check the temperature of the chipset under load (normal to 70 ° C) |

Compare the results in AnTuTu with the benchmarks (~300,000–350,000)

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If your device has a different processor (such as the Snapdragon 730 or Mediatek Helio P90), this may indicate a counterfeit or replacement of the motherboard, in which case it is recommended to contact the service center for diagnosis.

Snapdragon 855 performance in 2026: is it relevant?

5 years after the release of the Snapdragon 855 is still able to cope with most tasks, but with some caveats:

• ✅ Daily tasks: Social media, instant messengers, video viewing (Full HD/4K) and web surfing work without delay.
• ⚠️ Games: Modern projects like PUBG Mobile or Honor of Kings are launching, but high settings can be slowed down due to the limitations of the Adreno 640.
• ✅ Multimedia: Hardware decoding H.265, VP9 and support HDR10+ make it comfortable to watch movies in high quality.
• ❌ AR/VR and heavy applications: Tasks that require neural networks (e.g., Stable Diffusion on a mobile device) will be performed slowly.

For an objective assessment, you can run a test in AnTuTu Benchmark or Geekbench 6. Typical results for the Snapdragon 855 in 2026:

• AnTuTu: 280,000–320,000 (vs. 400,000+ for new flagships).
• Geekbench (single-core): 700-800.
• Geekbench (multi-core): 2500–2800.

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If your Mi9 is slowing down, try rolling back the firmware to MIUI 12.5 — newer versions are often optimized for fresh chipsets and can slow down the SD855.

By comparison, the modern Snapdragon 8 Gen 2 (2023) scores around 1,300,000 in AnTuTu, a difference of almost 4 times. However, for most users, the SD855 remains sufficient, especially if you don’t chase the latest games.

Frequent CPU Problems in Xiaomi Mi9 and Their Solutions

Despite the reliability of the Snapdragon 855, Mi9 owners sometimes face performance-related issues.

1. Chipset overheating

At long loads (games, video editing), the processor temperature can reach 70-80°C, which leads to trottling (automatic frequency reduction). This is normal behavior for Mi9, but it can be mitigated:

• 🔧 Remove the case during games.
• 🌡️ Use a cooling stand or fan.
• 🔄 Limit FPS to the game settings (e.g., 60 FPS instead of 90 FPS).

2.Slowdown after MIUI update

New firmware versions (e.g. MIUI 14) may not be optimized enough for the Snapdragon 855.

• 🔄 Reverse to MIUI 12.5 (most stable for Mi9).
• 🧹 Clear the cache through Settings → Warehouse → Cleanup.
• 🚫 Turn off animations in Settings → Special Options → Remove animations.

Gaming disruptions (departures, artifacts)

If games get painted or graphical glitches appear, the fault may be the outdated Adreno 640 driver.

• 🔧 Update drivers through Google Play Services.
• 🎮 OpenGL ES Driver Update from Play Market.
• 🔄 Reset the graphics settings in the engineering menu (#4636###).

⚠️ Warning: If the CPU temperature exceeds 85°C in idle, this may indicate a thermal paste malfunction or damage to the motherboard, in which case repairs to the service center are required.

Xiaomi Mi9 Modifications: Are There Differences in Processors?

The Xiaomi Mi9 came in several versions, but all of them were equipped with the Snapdragon 855, without exception.

Important: Mi9 Pro 5G received an updated chipset – Snapdragon 855+ with increased frequencies (2.96 GHz instead of 2.84 GHz), but this is a separate model that has no direct relation to the basic Mi9.

There was also a Mi9 SE with a Snapdragon 712 processor, but it was a completely different smartphone in specs and price category.

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All versions of Xiaomi Mi9 (except Mi9 SE and Mi9 Pro 5G) are equipped with Snapdragon 855 unchanged. Regional differences concern only support for LTE- bands, not the processor.

Xiaomi Mi9 alternatives with the same processor

If you are interested in the Snapdragon 855, but the Mi9 for some reason is not suitable, consider other smartphones with this chipset:

• The 📱 Samsung Galaxy S10/S10+ is the best screen (Dynamic AMOLED) and cameras, but more expensive.
• 📱 OnePlus 7 Pro is a 90Hz display and pure OxygenOS (no intrusive MIUI).
• 📱 Asus ROG Phone II is a gaming smartphone with a 120Hz screen and additional coolers.
• 📱 Sony Xperia 1 is a unique 21:9 display and the best photo/video processing.
• 📱 LG G8 ThinQ — stereo speakers and Quad DAC support for audiophiles.

Each of these smartphones has its own advantages, but the Xiaomi Mi9 stands out for its optimal price-performance ratio, especially in the secondary market.

If you need a smartphone with Snapdragon 855+, pay attention to:

• Asus ROG Phone II (Game version with SD855+)
• Redmi K20 Pro Premium (Chinese version of Mi9 with SD855+).

FAQ: Frequent questions about the Xiaomi Mi9 processor