AMD Instinct MI455X vs Intel Arc A380M Comparison

# Head-to-Head Benchmarks

The recorded database contains no direct head-to-head benchmark results for the AMD Instinct MI455X and the Intel Arc A380M. Both entries show zero benchmark scores, zero wins on either side, and no nearest rival data. The percentile ranking for both parts sits at 50, indicating the database has not yet established a comparative performance baseline for either accelerator. Without measured frames per second, compute throughput scores, or synthetic test results, any numerical comparison between these two parts must rely entirely on their specified hardware characteristics rather than observed performance data.

What the specifications do reveal is a staggering gap in raw compute capacity. The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance and an identical 157.3 TFLOPS of FP16 performance with a 1:1 ratio. The Intel Arc A380M, by contrast, provides 4.096 TFLOPS of FP32 and 8.192 TFLOPS of FP16 with a 2:1 ratio. The MI455X therefore offers 38.4 times the FP32 throughput of the A380M, and 19.2 times the FP16 throughput. These are not incremental differences; they represent entirely different performance classes. The texture rate tells a similar story: the MI455X reaches 2,457.6 GTexel/s while the A380M manages 128.0 GTexel/s, a 19.2-fold advantage for the AMD part.

Memory bandwidth amplifies the divide. The MI455X carries 432 GB of HBM4 memory across a 24,576-bit bus, producing 23.3 TB/s of bandwidth. The A380M uses 6 GB of GDDR6 on a 96-bit bus, yielding 186.0 GB/s. The MI455X delivers 125.3 times the memory bandwidth of the A380M. Even the pixel rate disparity is absolute: the MI455X reports 0 MPixel/s while the A380M achieves 64.00 GPixel/s. The AMD part has no ROP units, making pixel output a non-attribute, whereas Intel's design includes 32 ROPs capable of traditional rasterization work.

Clock behavior also differs substantially. The MI455X runs at a 1000 MHz base clock and 2400 MHz boost, while the A380M operates at 1550 MHz base and 2000 MHz boost. Despite the A380M's higher base frequency, the MI455X's massive shader count (32,768 versus 1,024) and texture unit count (1,024 versus 64) completely overwhelm the frequency disadvantage. The MI455X has 32 times the shading units and 16 times the texture mapping units of the A380M.

# Architecture Differences

The two accelerators stem from fundamentally different design philosophies and process technologies. The AMD Instinct MI455X uses the CDNA 5.0 architecture, specifically the MI450 256CU chip, fabricated on a 2 nm process at TSMC. Intel's Arc A380M uses the Xe-HPG architecture with the DG2-128 chip, built on a 6 nm process, also at TSMC. The process node gap is significant: 2 nm versus 6 nm represents multiple generations of lithographic advancement, directly impacting transistor density and power efficiency.

Transistor counts reflect this architectural chasm. The MI455X integrates 320,000 million transistors on a 2990 mm² die, yielding a density of 107.0M transistors per square millimeter. The A380M contains 7,200 million transistors on a 157 mm² die, with a density of 45.9M per square millimeter. The MI455X packs 44.4 times more transistors overall, and its density advantage of 2.33 times indicates a much more aggressive scaling of features per unit area. The die size difference alone, 2990 mm² versus 157 mm², places these parts in different physical leagues.

Memory architecture diverges completely. The MI455X uses HBM4, a high-bandwidth stacked memory technology, with a 24,576-bit interface. The A380M uses GDDR6, a conventional graphics memory, on a 96-bit interface. The MI455X's memory clock runs at 1900 MHz with 7.6 Gbps effective data rate, while the A380M's memory clock is 1937 MHz with 15.5 Gbps effective. The A380M's higher per-pin data rate does nothing to close the bandwidth gap because the MI455X's bus width is 256 times larger.

Compute feature sets differ in kind, not just degree. The MI455X has no ray tracing cores listed, no tensor cores listed, and no API support for DirectX, OpenGL, or Vulkan. Its role is pure compute acceleration. The A380M includes 8 ray tracing cores and supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The A380M is a graphics-capable mobile part, while the MI455X is a datacenter compute module with no display outputs. The MI455X lists "No outputs" for display, while the A380M's outputs are "Portable Device Dependent," meaning the host laptop determines connectivity.

Power and physical format reinforce the positioning. The MI455X has a TDP of 2300 W, requires a 2700 W suggested PSU, and uses an EAM Module slot with no power connectors (likely relying on the module interface itself). The A380M draws 35 W and uses an MXM Module with an MXM-A (3.1) bus interface. The MI455X is 65.7 times more power-hungry than the A380M. The bus interfaces also differ: the MI455X uses PCIe 6.0 x16, while the A380M uses MXM-A (3.1), a mobile module standard.

# The Verdict

The data indicates that these two products serve no overlapping purpose. The AMD Instinct MI455X is a datacenter-scale compute accelerator designed for massive parallel workloads requiring extreme FP32/FP16 throughput, enormous memory capacity, and unprecedented bandwidth. The Intel Arc A380M is a low-power mobile graphics solution intended for laptops and compact systems requiring modest 3D rendering and compute capabilities within a 35 W envelope.

Benchmark results are absent from the database, so no performance ranking can be assigned. However, the specification sheet alone establishes that the MI455X outperforms the A380M by factors ranging from 19.2 times (FP16, texture rate) to 125.3 times (memory bandwidth) in raw throughput metrics. The A380M leads only in pixel rate (64.00 GPixel/s versus 0 MPixel/s), base clock speed (1550 MHz versus 1000 MHz), and memory clock effective data rate per pin (15.5 Gbps versus 7.6 Gbps). None of these A380M advantages translate into meaningful compute superiority.

The MI455X is the clear choice for workloads like large-scale AI training, scientific simulation, or any task where FP32 throughput and memory bandwidth are the limiting factors. The A380M is appropriate for mobile devices needing basic graphics acceleration, video playback, or light compute tasks where the 2300 W power requirement of the MI455X is physically impossible to accommodate. No buyer would reasonably choose between them; the selection is dictated entirely by the use case.

# Specification Differences

The two parts differ in nearly every measurable specification. Process node: 2 nm (MI455X) versus 6 nm (A380M). Transistors: 320,000 million versus 7,200 million. Die size: 2990 mm² versus 157 mm². Transistor density: 107.0M / mm² versus 45.9M / mm². Base clock: 1000 MHz versus 1550 MHz. Boost clock: 2400 MHz versus 2000 MHz. Memory clock: 1900 MHz (7.6 Gbps effective) versus 1937 MHz (15.5 Gbps effective). Memory size: 432 GB versus 6 GB. Memory type: HBM4 versus GDDR6. Memory bus width: 24,576 bit versus 96 bit. Memory bandwidth: 23.3 TB/s versus 186.0 GB/s. Shading units: 32,768 versus 1,024. TMUs: 1,024 versus 64. ROPs: 0 versus 32. Ray tracing cores: none listed versus 8. Pixel rate: 0 MPixel/s versus 64.00 GPixel/s. Texture rate: 2,457.6 GTexel/s versus 128.0 GTexel/s. FP32: 157.3 TFLOPS versus 4.096 TFLOPS. FP16: 157.3 TFLOPS (1:1) versus 8.192 TFLOPS (2:1). TDP: 2300 W versus 35 W. Slot width: EAM Module versus MXM Module. Power connectors: None versus not listed. Suggested PSU: 2700 W versus not listed. Bus interface: PCIe 6.0 x16 versus MXM-A (3.1). Display outputs: No outputs versus Portable Device Dependent. DirectX support: N/A versus 12 Ultimate (12_2). OpenGL: N/A versus 4.6. Vulkan: N/A versus 1.4. Release date: 2026-07-22 versus 2023-01-23. Production status: not listed versus Active. Predecessor: Radeon Instinct versus none listed. Successor: none listed for either.

# FAQ

Q: Which GPU has more FP32 compute power?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance, while the Intel Arc A380M provides 4.096 TFLOPS. The MI455X is 38.4 times faster in FP32.

Q: What is the memory bandwidth difference?

A: The MI455X has 23.3 TB/s of bandwidth from 432 GB of HBM4 on a 24,576-bit bus. The A380M has 186.0 GB/s from 6 GB of GDDR6 on a 96-bit bus. The MI455X provides 125.3 times the bandwidth.

Q: Does either GPU support DirectX?

A: The AMD MI455X lists DirectX as N/A, along with OpenGL and Vulkan as N/A. The Intel A380M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What are the power requirements?

A: The MI455X has a TDP of 2300 W and requires a suggested PSU of 2700 W. The A380M has a TDP of 35 W with no suggested PSU listed.

Q: When were they released?

A: The MI455X has a release date of 2026-07-22. The A380M has a release date of 2023-01-23.

Q: How many ray tracing cores does each have?

A: The MI455X has no ray tracing cores listed. The A380M has 8 ray tracing cores.

# Where Each One Wins

The AMD Instinct MI455X wins decisively in every raw compute metric recorded. Its 157.3 TFLOPS FP32 and FP16 performance, 2,457.6 GTexel/s texture rate, 23.3 TB/s memory bandwidth, 432 GB memory capacity, and 32,768 shading units position it for massive parallel workloads. The 2 nm process node and 320,000 million transistors provide the foundation for this throughput. The MI455X also wins on process technology (2 nm versus 6 nm), transistor density (107.0M / mm² versus 45.9M / mm²), and die size (2990 mm² versus 157 mm²). Its PCIe 6.0 x16 interface offers substantially higher host connectivity bandwidth than the MXM-A (3.1) interface of the A380M.

The Intel Arc A380M wins in exactly four recorded categories. It has a higher base clock (1550 MHz versus 1000 MHz). It has a higher effective memory data rate per pin (15.5 Gbps versus 7.6 Gbps). It has 32 ROPs and a 64.00 GPixel/s pixel rate, whereas the MI455X has 0 ROPs and 0 MPixel/s. It also supports graphics APIs (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4) that the MI455X lacks entirely. The A380M additionally has 8 ray tracing cores, the MI455X has none listed, and its 35 W TDP makes it feasible for mobile deployment while the MI455X requires 2300 W. The A380M also has an earlier release date (2023-01-23 versus 2026-07-22) and an active production status, while the MI455X has no production status listed.

For practical use, the MI455X wins in datacenter compute, AI training, scientific simulation, and any workload where FP32/FP16 throughput and memory bandwidth are paramount. The A380M wins in mobile graphics, laptop 3D rendering, ray-traced workloads within its capability range, and any scenario where power consumption must stay under a few hundred watts. The MI455X cannot display output and has no graphics API support, so it cannot function as a display adapter. The A380M cannot approach the MI455X's compute density, so it cannot serve high-throughput compute roles. The choice between them is not a matter of preference but of hardware requirements.