Dimensity 8400 Ultra: Specs, Pros & Cons, Alternatives

KACBU

Should I buy it?

Dimensity 8400 Ultra

CONSIDER

Great choice if these matter:

Daily Use
Value for Money
Gaming

Watch out for:

The Mali-G720 MC7 GPU trails Snapdragon rivals in sustained gaming.
No hardware ray tracing at a tier where the 8s Gen 3 offers it.

Regret riskLOWlimited data

Main risks

The Mali-G720 MC7 GPU trails Snapdragon rivals in sustained gaming.
No hardware ray tracing at a tier where the 8s Gen 3 offers it.
MediaTek does not publish detailed cache or TDP figures.
The 'Ultra' naming is Xiaomi marketing for what is at heart the Dimensity 8400.

The risk level is computed from the release date and verified weaknesses. The confidence score appears only once enough owner reports exist.

Alternatives

Dimensity 8500 Ultra

Google Tensor G6

This box relies only on verified specs, the release date and editorial assessment; owner reports join them as they come in. We do not predict prices.

Core Structure

How many cores does the processor have?

Manufacturer's official core and architecture information.

CORE STRUCTURE

The structure decisive in multi-core tasks.

8 Core

8-core — Total Cores · 8 Thread — Concurrent Threads · 1 Performance — High-performance core · 4 Efficiency — Low-power core · Cortex-A725 (all big cores) — Core architecture

8-core8 Thread1 Performance4 EfficiencyCortex-A725 (all big cores)

8-coreTotal Cores

8 ThreadConcurrent Threads

1 PerformanceHigh-performance core

4 EfficiencyLow-power core

Cortex-A725 (all big cores)Core architecture

Frequency

How fast does it work?

Manufacturer's official frequency values.

FREQUENCY

Value that determines single-core performance.

3.25 GHz Boost

3.25 GHz — Maximum boost frequency · 3.0 GHz — Efficiency core frequency

3.25 GHz3.0 GHz

3.25 GHzMaximum boost frequency

3.0 GHzEfficiency core frequency

Power and Cooling

How much power does it draw?

Official power values that determine cooling needs.

POWER AND COOLING

These values determine the cooling budget.

—

Device dependent — Cooling solution

Device dependent

Device dependentCooling solution

Who Is It For?

Where does it stand out?

A usage guide built from the specs and the editors' tags; not a test result.

Daily Use

A balanced spec set for everyday use: display, battery and camera figures together.

Good fit

Value for Money

An editor's tag for hardware that is well priced for what it offers. We do not track current prices; check the price before you buy.

Good fit

Gaming

For gaming; tagged from the display's refresh rate and the chip's class. We have not measured frame rates or heat ourselves.

Good fit

Editorial Analysis

Strengths and points to consider

The Kacbu editors' assessment of the specifications the maker publishes. We do not test devices ourselves, so nothing here is a measured result. Anything taken from an independent review is shown with its publication and date in the Press section.

Strengths based on the specs

All eight cores are Cortex-A725 — no little cores, a first at this tier.

Prime core at 3.25 GHz delivers near-flagship multi-core performance.

TSMC's N4P process keeps it remarkably efficient; big-battery phones love it.

The 'Ultra' bin is Xiaomi-tuned with camera and network integration for its phones.

Strong value: flagship-adjacent speed at upper-mid-range phone prices.

Things to consider

The Mali-G720 MC7 GPU trails Snapdragon rivals in sustained gaming.

No hardware ray tracing at a tier where the 8s Gen 3 offers it.

MediaTek does not publish detailed cache or TDP figures.

The 'Ultra' naming is Xiaomi marketing for what is at heart the Dimensity 8400.

Historical Product Info

Official launch details

Instead of tracking today's retail price, Kacbu keeps the product's official launch information as a reference.

AnnouncedDecember 23, 2024

The manufacturer's official announcement date.

Design🇹🇼 Taiwan

Manufacturing🇹🇼 Taiwan

MediaTek is headquartered in Hsinchu, Taiwan and designs the chip there; the Dimensity 8400 is fabricated on TSMC's N4P process, also in Taiwan.

This is not the current retail price — it shows the product's historical, official launch information.

Specifications

Dimensity 8400 Ultra specifications

Click a linked value to see other products that share that same spec, and leave a comment on that spec.

General

Family

Dimensity 8000

Segment

Mobile upper-midrange SoC

Release Year

2024

Manufacturer

MediaTek

Core Structure

Cores

Threads

Core Architecture

Cortex-A725 (all big cores)

Efficiency Core

Performance Core

Frequency

Boost Clock

3.25 GHz

Efficiency-Core Clock

3.0 GHz

Cache

Cache Note

MediaTek does not publish detailed cache sizes

Memory

Memory Type

LPDDR5X

Graphics Unit

Integrated Graphics

Mali-G720 MC7

Power

Cooling Solution

Device dependent

Platform

Socket

BGA (SoC)

Manufacturing Process

TSMC N4P

Lithography

4 nm

FAQ

The most common questions about this product

What the numbers on the spec sheet actually mean in day-to-day use.

What does 'Ultra' mean here?

It is Xiaomi's co-branding for its tuned bin of the MediaTek Dimensity 8400 — the same all-big-core silicon with Xiaomi-specific camera, display and network integration. The core specs match the standard 8400.

How can all-big-core be efficient?

The Cortex-A725 scales down well: at low load the cores simply run at low clocks, where they are nearly as frugal as dedicated little cores — and under load, eight big cores finish work faster and go back to sleep sooner.

Which phones use the Dimensity 8400 Ultra?

Xiaomi's value line — the 15T and several Redmi flagships. Every phone in this catalogue that carries it is listed on this page, so you can compare them directly.

Shared Hardware