AMD Instinct MI455X vs Intel Arc G3 Extreme Comparison

The Verdict

The recorded data presents two accelerators with fundamentally different purposes. The AMD Instinct MI455X is a data center compute module built for massive parallel throughput, while the Intel Arc G3 Extreme is an integrated graphics processor for portable devices. The MI455X delivers 157.3 TFLOPS FP32 performance, which is 20.5 times the Arc G3 Extreme's 7.680 TFLOPS. The Arc G3 Extreme counters with full graphics API support, including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI455X reports no graphics APIs at all. The MI455X targets workloads where raw compute density matters, and the Arc G3 Extreme targets systems requiring display output and conventional graphics acceleration. Neither device wins outright; each serves a distinct deployment scenario.

Architecture Differences

The MI455X uses the CDNA 5.0 architecture on a 2 nm TSMC process, packing 320,000 million transistors into a 2990 mm² die. This yields a transistor density of 107.0M per square millimeter. The chip is designated MI450 256CU, indicating 256 compute units. The Arc G3 Extreme uses the Xe3-LPG architecture on Intel's 3 nm process, with the Panther Lake chip. The MI455X operates with a base clock of 1000 MHz and a boost clock of 2400 MHz, while the Arc G3 Extreme runs at a 300 MHz base and 2500 MHz boost. The MI455X has 32,768 shading units, 1,024 texture mapping units, and no ROPs, resulting in a pixel rate of 0 MPixel/s. The Arc G3 Extreme has 1,536 shading units, 48 TMUs, 24 ROPs, and 12 ray tracing cores, delivering a 60.00 GPixel/s pixel rate.

The MI455X uses HBM4 memory with 432 GB capacity, a 24,576-bit bus, and 23.3 TB/s bandwidth. Its memory clock runs at 1900 MHz with 7.6 Gbps effective. The Arc G3 Extreme uses system shared memory with system dependent bandwidth, meaning its memory performance scales with the host platform. The MI455X has no display outputs, while the Arc G3 Extreme provides portable device dependent outputs. The MI455X supports no graphics APIs, whereas the Arc G3 Extreme supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Where Each One Wins

The MI455X wins decisively in raw compute throughput. Its FP32 performance of 157.3 TFLOPS dwarfs the Arc G3 Extreme's 7.680 TFLOPS, a 20.5x advantage. The MI455X also leads in texture rate with 2,457.6 GTexel/s versus 120.0 GTexel/s, a 20.5x margin. Its FP16 output matches FP32 at 157.3 TFLOPS with a 1:1 ratio, whereas the Arc G3 Extreme delivers 15.36 TFLOPS FP16 at a 2:1 ratio. The MI455X memory subsystem provides 432 GB of HBM4 with 23.3 TB/s bandwidth, compared to the Arc G3 Extreme's system shared memory with system dependent bandwidth. These specifications indicate the MI455X is built for large-scale compute tasks such as AI training and scientific simulation.

The Arc G3 Extreme wins in graphics capability and integration. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it suitable for conventional rendering workloads. Its 60.00 GPixel/s pixel rate and 12 ray tracing cores enable graphics rendering that the MI455X cannot perform. The Arc G3 Extreme operates as an IGP with an 80 W TDP and no power connectors, while the MI455X is an EAM Module requiring a 2700 W suggested PSU. The Arc G3 Extreme achieves a 2500 MHz boost clock while consuming far less power. Its production status is Active, while the MI455X has no production status listed.

FAQ

Q: Which device delivers higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS FP32, which is 20.5 times the Intel Arc G3 Extreme's 7.680 TFLOPS.

Q: Does the AMD Instinct MI455X support graphics APIs?

A: No, the MI455X reports N/A for DirectX, OpenGL, and Vulkan, and has no display outputs. The Intel Arc G3 Extreme supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What memory configurations do the two devices use?

A: The MI455X uses 432 GB of HBM4 with a 24,576-bit bus and 23.3 TB/s bandwidth. The Arc G3 Extreme uses system shared memory with system dependent bandwidth.

Q: How do their power requirements compare?

A: The MI455X has a 2300 W TDP and a 2700 W suggested PSU, while the Arc G3 Extreme has an 80 W TDP and no suggested PSU listed.

Q: Which device has ray tracing support?

A: The Intel Arc G3 Extreme includes 12 ray tracing cores. The AMD Instinct MI455X has no ray tracing cores listed.

Q: What are their respective form factors?

A: The MI455X is an EAM Module with no power connectors and no display outputs. The Arc G3 Extreme is an IGP with portable device dependent display outputs.

Head-to-Head Benchmarks

The recorded head-to-head benchmark data shows zero wins for either device, and the average benchmark scores for both are 0. However, the specification sheet reveals substantial performance deltas. The most significant advantage for the MI455X is in FP32 compute: 157.3 TFLOPS versus 7.680 TFLOPS, a 20.5x gap. Texture rate follows the same pattern, with the MI455X achieving 2,457.6 GTexel/s against the Arc G3 Extreme's 120.0 GTexel/s, also a 20.5x difference. The MI455X FP16 output of 157.3 TFLOPS exceeds the Arc G3 Extreme's 15.36 TFLOPS by 10.2x.

The Arc G3 Extreme holds advantages in areas where the MI455X has no capability. The MI455X pixel rate is 0 MPixel/s, while the Arc G3 Extreme delivers 60.00 GPixel/s. The MI455X has no ROPs, while the Arc G3 Extreme has 24 ROPs. The MI455X has no ray tracing cores, while the Arc G3 Extreme has 12. The MI455X supports no graphics APIs, while the Arc G3 Extreme supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Arc G3 Extreme also operates at a higher boost clock of 2500 MHz compared to the MI455X's 2400 MHz, though the MI455X has a higher base clock at 1000 MHz versus 300 MHz.

Specification Differences

The two devices differ across nearly every specification field. The MI455X uses a 2 nm process at TSMC with 320,000 million transistors and a 2990 mm² die size, while the Arc G3 Extreme uses a 3 nm process at Intel with unknown transistor count and die size. The MI455X architecture is CDNA 5.0, and the Arc G3 Extreme uses Xe3-LPG. The MI455X belongs to the Instinct (MIx) generation, while the Arc G3 Extreme is in the Arc Graphics-M (Panther Lake) generation.

Clock specifications differ: the MI455X has a 1000 MHz base and 2400 MHz boost, while the Arc G3 Extreme has a 300 MHz base and 2500 MHz boost. The MI455X memory clock is 1900 MHz with 7.6 Gbps effective, while the Arc G3 Extreme uses system shared memory. Memory capacity differs drastically: 432 GB HBM4 for the MI455X versus system shared for the Arc G3 Extreme. The memory bus is 24,576 bit for the MI455X versus system shared for the Arc G3 Extreme. Bandwidth is 23.3 TB/s for the MI455X versus system dependent for the Arc G3 Extreme.

Compute unit counts differ: the MI455X has 32,768 shading units, 1,024 TMUs, and 0 ROPs, while the Arc G3 Extreme has 1,536 shading units, 48 TMUs, and 24 ROPs. The MI455X has no ray tracing cores, while the Arc G3 Extreme has 12. The MI455X texture rate is 2,457.6 GTexel/s versus 120.0 GTexel/s for the Arc G3 Extreme. The MI455X FP32 is 157.3 TFLOPS versus 7.680 TFLOPS, and FP16 is 157.3 TFLOPS (1:1) versus 15.36 TFLOPS (2:1).

Power and form factor differ substantially: the MI455X has a 2300 W TDP, EAM Module slot width, no power connectors, and a 2700 W suggested PSU, while the Arc G3 Extreme has an 80 W TDP, IGP slot width, no power connectors, and no suggested PSU. The bus interface is PCIe 6.0 x16 for the MI455X versus IGP for the Arc G3 Extreme. Display outputs are absent on the MI455X but portable device dependent on the Arc G3 Extreme. The MI455X supports no graphics APIs, while the Arc G3 Extreme supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Arc G3 Extreme has an Active production status, while the MI455X has none listed. The Arc G3 Extreme released on 2026-05-31, and the MI455X on 2026-07-22.