AMD Instinct MI455X vs Intel Iris Xe Graphics 80EU Mobile Comparison

The Verdict

The recorded data places the AMD Instinct MI455X and the Intel Iris Xe Graphics 80EU Mobile at opposite ends of the GPU spectrum, with no overlapping use cases. The MI455X is a compute accelerator built for massive parallel workloads, while the Iris Xe is an integrated graphics solution for everyday portable computing. Benchmark results indicate a complete functional separation: the MI455X delivers 157.3 TFLOPS of FP32 compute, while the Iris Xe delivers 1.856 TFLOPS. For users requiring data-center-scale throughput, the MI455X is the only option. For systems needing an integrated display output with API support for modern graphics, the Iris Xe is the practical choice. The MI455X has no display outputs and no DirectX, OpenGL, or Vulkan support, making it unsuitable for any interactive graphics task. Conversely, the Iris Xe lacks the memory bandwidth and compute resources for the MI455X's intended workloads. The data shows two products that do not compete; the selection depends entirely on the workload class.

Architecture Differences

The AMD Instinct MI455X uses the MI450 256CU chip built on a 2 nm TSMC process. The chip contains 320,000 million transistors across a 2990 mm² die, yielding a transistor density of 107.0M per mm². The architecture is CDNA 5.0, part of the Instinct (MIx) generation, and it is the successor to the Radeon Instinct line. The memory subsystem consists of 432 GB of HBM4 with a 24576-bit bus width and 23.3 TB/s of bandwidth. The memory clock runs at 1900 MHz with 7.6 Gbps effective transfer rate.

The Intel Iris Xe Graphics 80EU Mobile uses the Raptor Lake chip on a 10 nm Intel process. The architecture is Generation 12.2, part of the HD Graphics-M (Raptor Lake) generation, and its successor is Arc Graphics-M. The memory is system shared, with system-dependent bandwidth. The base clock is 300 MHz with a boost of 1450 MHz. The Iris Xe has 640 shading units, 40 TMUs, and 20 ROPs. It supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4, whereas the MI455X reports N/A for all three APIs. The MI455X uses a PCIe 6.0 x16 bus interface, while the Iris Xe uses a Ring Bus. The MI455X is an EAM Module with no power connectors, while the Iris Xe is an IGP with no slot width requirement.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32, while the Intel Iris Xe Graphics 80EU Mobile delivers 1.856 TFLOPS. The MI455X is approximately 85 times higher in raw FP32 throughput.

Q: Can the AMD Instinct MI455X output video to a display?

A: No. The MI455X has no display outputs. The Intel Iris Xe Graphics 80EU Mobile has display outputs described as portable device dependent, meaning it can drive displays in supported portable systems.

Q: What memory configurations do these two GPUs use?

A: The MI455X uses 432 GB of HBM4 with a 24576-bit bus and 23.3 TB/s bandwidth. The Iris Xe uses system shared memory with system dependent bandwidth, meaning it relies on the host system's RAM.

Q: Which GPU supports modern graphics APIs?

A: The Intel Iris Xe supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4. The AMD Instinct MI455X reports N/A for DirectX, OpenGL, and Vulkan, indicating no graphics API support.

Q: What are the power requirements for each?

A: The MI455X has a TDP of 2300 W with a suggested PSU of 2700 W. The Iris Xe has a TDP of 15 W and no suggested PSU is listed.

Q: Which GPU has a higher texture rate?

A: The MI455X has a texture rate of 2,457.6 GTexel/s, while the Iris Xe has 58.00 GTexel/s. The MI455X is significantly ahead in texture throughput.

Specification Differences

The two GPUs differ across nearly every recorded specification field. The process node differs: 2 nm for the MI455X versus 10 nm for the Iris Xe. The MI455X has 320,000 million transistors on a 2990 mm² die, while the Iris Xe has no recorded transistor count or die size. The base clock is 1000 MHz for the MI455X versus 300 MHz for the Iris Xe. The boost clock is 2400 MHz versus 1450 MHz. The memory clock is 1900 MHz for the MI455X, while the Iris Xe uses system shared memory.

The MI455X has 32768 shading units, 1024 TMUs, and 0 ROPs. The Iris Xe has 640 shading units, 40 TMUs, and 20 ROPs. The pixel rate is 0 MPixel/s for the MI455X versus 29.00 GPixel/s for the Iris Xe. The texture rate is 2,457.6 GTexel/s versus 58.00 GTexel/s. FP32 is 157.3 TFLOPS versus 1.856 TFLOPS. FP16 is 157.3 TFLOPS (1:1) for the MI455X versus 3.712 TFLOPS (2:1) for the Iris Xe. TDP is 2300 W versus 15 W.

The slot width is EAM Module for the MI455X versus IGP for the Iris Xe. The MI455X has no power connectors, while the Iris Xe has none listed. The suggested PSU is 2700 W for the MI455X, with no value for the Iris Xe. The bus interface is PCIe 6.0 x16 versus Ring Bus. The MI455X has no display outputs, while the Iris Xe has portable device dependent outputs. The API support differs: N/A for all three APIs on the MI455X versus DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4 on the Iris Xe. The production status is null for the MI455X but active for the Iris Xe. The release dates differ: 2026-07-22 for the MI455X versus 2023-01-03 for the Iris Xe.

Head-to-Head Benchmarks

The head-to-head benchmark database contains no direct comparison entries, so the analysis relies on the recorded specification-derived performance metrics. The largest win for the MI455X is in FP32 compute: 157.3 TFLOPS versus 1.856 TFLOPS for the Iris Xe. This is a ratio of roughly 85:1. In FP16, the MI455X delivers 157.3 TFLOPS with a 1:1 ratio, while the Iris Xe delivers 3.712 TFLOPS with a 2:1 ratio. The MI455X is about 42 times higher in FP16 throughput.

The texture rate favors the MI455X at 2,457.6 GTexel/s versus 58.00 GTexel/s for the Iris Xe. Memory bandwidth shows the largest gap: 23.3 TB/s versus system dependent bandwidth for the Iris Xe. The MI455X's memory bus is 24576-bit, while the Iris Xe's is system shared. The shading unit count is 32768 versus 640, a 51-fold difference. The TMU count is 1024 versus 40.

The Iris Xe wins in pixel rate: 29.00 GPixel/s versus 0 MPixel/s for the MI455X. The MI455X has no ROPs, meaning it cannot perform traditional rasterization output. The Iris Xe has 20 ROPs. The Iris Xe also wins in API support, offering DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4, while the MI455X reports N/A for all. The Iris Xe has display outputs, while the MI455X has none. The Iris Xe's lower TDP of 15 W versus 2300 W also represents a significant operational difference, though both are designed for their respective platforms.

Where Each One Wins

The AMD Instinct MI455X wins decisively in raw compute throughput. Its 157.3 TFLOPS FP32 and FP16 (1:1) performance targets data-center workloads that require massive parallel math. The 432 GB HBM4 memory with 23.3 TB/s bandwidth supports large datasets. The 24576-bit memory bus and PCIe 6.0 x16 interface are built for high-throughput data movement. The 2300 W TDP with a 2700 W suggested PSU reflects its role as a dedicated accelerator module, not a consumer graphics card. The texture rate of 2,457.6 GTexel/s and 32768 shading units indicate heavy compute-oriented shader work.

The Intel Iris Xe Graphics 80EU Mobile wins in integrated graphics capability. It provides display outputs, making it suitable for portable devices. Its 29.00 GPixel/s pixel rate and 20 ROPs enable actual rasterization. The API support for DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4 allows it to run modern graphics applications. The 15 W TDP fits within the power envelope of a mobile processor. The system shared memory approach eliminates the need for dedicated VRAM. The Ring Bus interface integrates directly with the host CPU.

The data shows no scenario where both GPUs could serve the same task. The MI455X cannot output video, run graphics APIs, or perform rasterization. The Iris Xe cannot approach the compute density, memory capacity, or bandwidth of the MI455X. The use-case split is absolute: the MI455X for computation-only acceleration, the Iris Xe for integrated graphics in portable systems.