Immortalis-G925 is ARM’s latest flagship GPU IP for premium and flagship mobile SoCs. In practical terms, it’s the graphics engine design that chipmakers (such as MediaTek and potentially others) license and integrate into their smartphone/tablet processors, and OEMs ship it in real devices.
What makes the Immortalis-G925 interesting isn’t just higher FPS. Arm positions it as a platform GPU designed for three goals that often compete on phones: (1) sustained gaming performance, (2) more realistic effects like ray tracing, and (3) accelerating AI workloads that increasingly run on the GPU alongside (or in support of) the NPU. Arm describes it as built on its 5th-generation GPU architecture, with upgrades targeting both raw throughput and efficiency.
Below is a clear, engineering-style breakdown of what the Immortalis-G925 is, how it differs from earlier Immortalis parts, and what you should focus on as a developer, system designer, or product spec reader.
What is Immortalis-G925?
Immortalis is ARM’s top GPU brand tier (above Mali), typically used in the highest-end mobile chips. Immortalis-G925 is the newest flagship model in that tier, designed for next-generation flagship smartphones and explicitly optimized for gaming and AI workloads.
Arm highlights these architectural changes and features for G925:
- Fragment prepass
- Doubled tiler throughput
- Improved command stream frontend
- Doubled shift-convert unit throughput
- Improved ray tracing performance
- Configurable scaling up to 24 cores
Those bullets sound abstract, but they map to real bottlenecks in modern mobile games: overdraw, geometry growth, shader cost, and ray tracing overhead – all under a strict thermal envelope.
Immortalis-G925: The performance and efficiency claims (and their implications)
Arm’s own testing on Arm Reference Platforms claims:
- ~37% better gaming performance (FPS) versus Immortalis-G720
- ~30% less power when delivering performance comparable to Immortalis-G720 [1]
Arm also discusses ray tracing gains:
- Up to 52% improvement in ray tracing performance with intricate objects
And for AI workloads (GPU-accelerated inference, not just graphics):
- ~36% faster inference versus Immortalis-G720 in Arm’s cited testing
- With example uplifts in image processing, super-sampling tasks, and NLP/speech-to-text scenarios
Why sustained performance matters more than peak FPS on phones
Mobile gaming bottlenecks are often thermal and power-limited. A GPU that hits a high peak score but throttles hard after a minute can feel worse than a slightly slower GPU that stays steady. Arm’s pitch for G925 is that architectural efficiency improvements make it easier for device makers to hold performance longer – especially in heavy titles.
Architectural changes that matter in real workloads
1) Fragment prepass (reducing overdraw and CPU work)
Arm calls out fragment prepass as a new mechanism designed to improve efficiency on geometry-heavy content and reduce wasted pixel shading work (overdraw). They also note that it can reduce CPU load by eliminating the need for some application-side object sorting. In Arm’s measurements, fragment prepass can reduce render thread cycles by removing object-sorting overhead (Arm reports up to a 43% reduction in render thread cycles in observed cases).
Practical takeaway: modern games continue to add scene detail. If the GPU can avoid shading pixels that are going to be overwritten anyway – and do so without pushing extra work back onto the CPU – you gain both FPS and battery/thermals.
2) Scaling core counts further (up to 24 cores)
Arm explicitly states that Immortalis-G925 scales up to 24 cores and contrasts this with the previous generation’s max configuration (Arm notes the prior generation’s max was 16).
Practical takeaway: this helps SoC designers target a wider range of flagship performance points, and it also suggests that Arm is targeting more than just phones (e.g., high-end tablets/Chromebooks), where power envelopes can be larger.
3) Ray tracing improvements focused on intricate objects and transparency
Arm’s blog post emphasizes ray tracing performance gains for intricate objects and discusses trade-offs between transparency accuracy, performance, and memory traffic.
Separately, MediaTek’s Dimensity 9400+ materials mention support for opacity micromap (OMM), enabling realistic effects such as vegetation/hair/feathers – precisely the kind of content that tends to be expensive with ray tracing.
Practical takeaway: Ray tracing on mobile is evolving from tech-demo reflections to more content-relevant effects, with geometry complexity and transparency posing high costs.
4) API support and ecosystem maturity signals
Notebookcheck’s overview of the G925 series lists support for OpenGL ES 3.2, Vulkan 1.3, and OpenCL 3.0.
And Khronos’ conformant products list includes an Immortalis-G925 Vulkan 1.4 conformance entry (a strong signal of driver/toolchain maturity for modern Vulkan usage, depending on the shipping platform and driver).
Practical takeaway: for developers, GPU capability is partly about APIs and drivers, not only silicon. Conformance entries and consistent API targets reduce “it works on my phone” problems.
Immortalis-G925 in devices
Because Immortalis-G925 is a GPU IP, it appears as part of a system-on-chip. A specific example is the MediaTek Dimensity 9400, which MediaTek describes as featuring a 12-core Arm GPU designed to improve both traditional and ray-traced graphics while delivering lower power consumption.
MediaTek also shares comparable performance figures for its own platform configurations, including peak performance, ray tracing, and efficiency improvements. While these numbers are chipset-specific and depend on factors such as clock speeds, memory, and thermal design, they help explain how the GPU performs in real-world products.
You might also notice higher-core variants appearing in other SoCs; for example, reports about Xiaomi’s in-house Xring chipset mention a 16-core Mali G925 configuration.
Comparison table: Immortalis-G925 vs nearby Arm GPUs
The table below focuses on what you can infer reliably from ARM’s published positioning and widely reported platform pairings, without pretending every device implementation will behave identically.
Read this table correctly: GPU IP sets the ceiling, but actual performance depends on memory bandwidth, clock speed, process node, SoC power budget, cooling, and software/driver quality. Two different SoCs using G925 won’t necessarily perform the same.
Also, learn more about ARM.
What to expect for developers and product designers
For game developers
Immortalis-G925 is aimed at the direction mobile games are already heading: more geometry, more complex fragment shaders, and more realism features. Arm’s public performance discussion explicitly cites real-world games and attributes part of the uplift to architectural changes such as fragment prepass and throughput improvements.
The bigger deal isn’t one headline percentage – it’s where that performance comes from. Reducing overdraw and improving job dispatch/tiler throughput tends to help a wide range of scenarios, including messy real content, as well as clean benchmark paths.
For SoC/device designers
G925’s scaling to 24 cores gives SoC vendors flexibility across multiple SKUs, and Arm also notes physical implementation readiness for advanced nodes in its broader platform messaging (which explains why you see it paired with modern 3nm-class flagship chips).
For buyers comparing phones
If you’re comparing devices, treat Immortalis-G925 as a strong indicator of a high-end graphics subsystem – but still validate:
- Sustained performance tests (longer gaming sessions),
- the exact GPU core configuration (e.g., 11/12/16 cores),
- And the device’s cooling/throttling behavior.
Conclusion
Immortalis-G925 is Arm’s current flagship mobile GPU IP, built on its 5th-generation GPU architecture and designed to deliver sustained gaming, ray-tracing realism, and GPU-accelerated AI. Arm emphasizes architectural changes, including a fragment prepass and throughput increases in key pipeline blocks, along with improved ray tracing capabilities and a broader scaling range up to 24 cores.
In real products, you’ll see it integrated into flagship SoCs. MediaTek explicitly pairs it with the Dimensity 9400 as a 12-core GPU, delivering higher peak performance, improved ray tracing, and better power efficiency.
If you’re writing specs, building products, or optimizing software: the Immortalis-G925 story is less about a single benchmark and more about architectural steps that help modern content run faster for longer – which is exactly what mobile users notice.
Sources
- Arm product page: Immortalis-G925 overview + feature list (fragment prepass, doubled tiler throughput, RT improvements, scaling).
- Arm Newsroom blog (May 2024): performance/efficiency claims vs Immortalis-G720; fragment prepass discussion; scaling to 24 cores; ray tracing and AI uplift discussion
- MediaTek Dimensity 9400 product page: 12-core Immortalis-G925 integration and platform claims.
- The Verge (May 2024): summary of Arm’s published ray tracing and power claims.
- Khronos Vulkan conformant products list: Vulkan conformance entry for Immortalis-G925 (platform/driver-dependent).
