AMD Instinct MI455X vs Intel Arc B580 Comparison

Head-to-Head Benchmarks

The database contains benchmark results for the Intel Arc B580, while the AMD Instinct MI455X has no recorded benchmark scores. This creates an asymmetric comparison: the Arc B580 can be evaluated against its nearest rivals, but the MI455X cannot be placed in a direct performance contest from the recorded data. The MI455X’s average benchmark score is 0, and its percentile rank among all GPUs is 50, which indicates a placeholder position rather than a measured outcome. The Arc B580, by contrast, has an average benchmark score of 23,021, placing it in the 68th percentile of all GPUs.

The Arc B580’s recorded scores show a clear hierarchy across different test types. Its strongest result is in Geekbench Vulkan, where it scores 109,672, followed by Geekbench OpenCL at 92,821. The Passmark G3D score is 15,748, while Passmark GPU Compute reaches 7,729. DirectX tests show lower numbers: Passmark DirectX 9 scores 183, DirectX 11 scores 128, and both DirectX 10 and DirectX 12 score 76. The Passmark G2D score is 709. These results indicate that the Arc B580 performs best in modern, compute-oriented workloads and less impressively in legacy DirectX rasterization tests.

When compared to its nearest rivals in the database, the Arc B580’s average score of 23,021 sits within a narrow band. It trails the AMD Radeon RX 580 2048SP by 0.2%, as that card averages 23,061. It also trails the NVIDIA P106-100 by 1%, since that card averages 23,249. Against the NVIDIA GeForce RTX 3080, the Arc B580 is 0.7% behind, with the RTX 3080 averaging 23,172. The only rival it leads is the NVIDIA GeForce RTX 2080, which it beats by 0.6%, as the RTX 2080 averages 22,895. These deltas are all within a 1.6 percentage point spread, which suggests the Arc B580 delivers performance comparable to a mid-range-to-high-end GPU from previous generations, not a flagship-class part.

The MI455X, with no benchmark entries, cannot be compared in this manner. Its specification sheet, however, suggests an entirely different performance class. The FP32 compute rating of 157.3 TFLOPS dwarfs the Arc B580’s 13.67 TFLOPS by a factor of more than 11. The FP16 rating of 157.3 TFLOPS (1:1) is similarly overwhelming compared to the Arc B580’s 27.34 TFLOPS (2:1). Texture rate for the MI455X is 2,457.6 GTexel/s versus 427.2 GTexel/s for the Arc B580. The MI455X has a pixel rate of 0 MPixel/s, which reflects its lack of display outputs, while the Arc B580 produces 213.6 GPixel/s. These numbers indicate that the MI455X is a compute accelerator with no graphics output capability, whereas the Arc B580 is a conventional graphics card.

The Verdict

The data supports a clear split: the Intel Arc B580 is a consumer graphics card with measurable gaming and compute performance, while the AMD Instinct MI455X is a data-center accelerator with no benchmark presence in the database. For anyone seeking a GPU that renders to a display, runs DirectX or Vulkan applications, and fits into a standard desktop PC, the Arc B580 is the only viable option. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and it provides display outputs via 1x HDMI 2.1a and 3x DisplayPort 2.1. The MI455X lists no APIs and no display outputs, making it unsuitable for interactive graphics workloads.

For compute-heavy tasks in a server environment, the MI455X’s raw specifications suggest massive throughput, but the database records no benchmark scores to confirm real-world performance. Its 432 GB of HBM4 memory, 23.3 TB/s bandwidth, and 32,768 shading units are far beyond the Arc B580’s 12 GB GDDR6, 456.0 GB/s bandwidth, and 2,560 shading units. However, the MI455X’s 2,300 W TDP and EAM Module slot width indicate a specialized installation that requires a 2,700 W suggested PSU, whereas the Arc B580 uses a dual-slot design with a 1x 8-pin connector and a 450 W suggested PSU. The MI455X is not a product for typical desktop use, and its lack of benchmark data means its actual performance cannot be verified from this database.

The Arc B580’s nearest rival comparisons show it is not a class leader. It sits nearly exactly between the RTX 2080 and the RX 580 2048SP, with a delta of 0.6% against the former and -0.2% against the latter. The RTX 3080, a higher-tier card, holds a 0.7% lead, and the P106-100, a mining-oriented part, leads by 1%. These small margins suggest that the Arc B580’s average score is well within the noise of these older or differently-purposed products. The 68th percentile rank confirms it is above the median GPU but not in the upper echelon.

FAQ

Q: Does the AMD Instinct MI455X have any benchmark scores in the database?

A: No. The MI455X has an empty benchmark array, an average benchmark score of 0, and no nearest rivals listed. The Intel Arc B580, by contrast, has 10 recorded benchmark entries.

Q: How does the Intel Arc B580 compare to its closest rival, the AMD Radeon RX 580 2048SP?

A: The Arc B580 averages 23,021, which is 0.2% lower than the RX 580 2048SP’s average of 23,061. This is a negligible difference, placing the two cards at nearly identical overall performance levels.

Q: What is the Arc B580’s best benchmark result?

A: The highest recorded score is 109,672 in Geekbench Vulkan. The second-highest is 92,821 in Geekbench OpenCL, indicating strong compute performance in modern APIs.

Q: What is the MI455X’s memory configuration?

A: The MI455X uses 432 GB of HBM4 memory with a 24,576-bit bus and 23.3 TB/s bandwidth. The Arc B580 uses 12 GB of GDDR6 with a 192-bit bus and 456.0 GB/s bandwidth.

Q: Which GPU has a higher FP32 compute rating?

A: The MI455X is rated at 157.3 TFLOPS, while the Arc B580 is rated at 13.67 TFLOPS. The MI455X’s rating is more than 11 times higher.

Q: Does the MI455X support any graphics APIs?

A: The database lists DirectX, OpenGL, and Vulkan as "N/A" for the MI455X, and it has no display outputs. The Arc B580 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Specification Differences

The two GPUs differ across nearly every measurable specification. The MI455X uses a 2 nm process node from TSMC, while the Arc B580 uses a 5 nm node from the same foundry. Transistor count is dramatically different: the MI455X has 320,000 million transistors on a 2,990 mm² die, yielding a density of 107.0M per mm². The Arc B580 has 19,600 million transistors on a 272 mm² die, with a density of 72.1M per mm². The MI455X’s die is more than 10 times larger and packs more than 16 times the transistors.

Clock speeds also diverge. The MI455X has a base clock of 1000 MHz and a boost of 2400 MHz, while the Arc B580 runs at a flat 2670 MHz for both base and boost. Memory clocks differ: the MI455X runs at 1900 MHz with 7.6 Gbps effective, while the Arc B580 runs at 2375 MHz with 19 Gbps effective. The MI455X’s memory bus is 24,576 bits wide versus 192 bits for the Arc B580, and the memory type is HBM4 versus GDDR6. The MI455X has 32,768 shading units, 1,024 TMUs, and 0 ROPs, while the Arc B580 has 2,560 shading units, 160 TMUs, and 80 ROPs. The MI455X has no RT cores listed, while the Arc B580 has 20. The MI455X’s TDP is 2,300 W, compared to 190 W for the Arc B580, and the suggested PSU is 2,700 W versus 450 W. The MI455X uses an EAM Module slot and has no power connectors, while the Arc B580 is dual-slot with a 1x 8-pin connector. The bus interface is PCIe 6.0 x16 for the MI455X and PCIe 4.0 x8 for the Arc B580. The MI455X has no display outputs, while the Arc B580 has 1x HDMI 2.1a and 3x DisplayPort 2.1.

Architecture Differences

The architectural gap between the two is fundamental. The MI455X is built on CDNA 5.0, a compute-focused architecture designed for accelerators, and its chip is labeled MI450 256CU. The Arc B580 uses Xe2-HPG, a high-performance graphics architecture, and its chip is BMG-G21. The MI455X belongs to the Instinct (MIx) generation, while the Arc B580 belongs to Battlemage (Arc 5). The MI455X’s predecessor is Radeon Instinct, and the Arc B580’s predecessor is Alchemist. The MI455X has no listed RT cores or tensor cores, and its FP16 throughput matches FP32 at a 1:1 ratio, indicating a design that prioritizes raw compute. The Arc B580 has 20 RT cores and FP16 throughput at a 2:1 ratio over FP32, which is typical for a graphics card with hardware ray tracing support.

The MI455X’s lack of ROPs and pixel rate of 0 MPixel/s confirms it is not designed for rasterization. Its texture rate of 2,457.6 GTexel/s is high, but without display outputs or graphics APIs, that throughput is intended for compute kernels, not rendering. The Arc B580’s 80 ROPs, 213.6 GPixel/s pixel rate, and full API support show it is a complete graphics solution. The MI455X has no production status listed, while the Arc B580 is marked as "Active." The release dates also differ: the MI455X is dated 2026-07-22, and the Arc B580 is dated 2024-12-12.

Where Each One Wins

The Intel Arc B580 wins in every scenario that involves user-facing graphics. It has display outputs, supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and its benchmark scores, while modest, are recorded and comparable to established GPUs. Its 190 W TDP and dual-slot design make it installable in standard PC cases with a 450 W PSU. Its 12 GB of GDDR6 memory is sufficient for mainstream gaming and content creation at its performance level. The Arc B580’s nearest rival data shows it performs within 1% of the RTX 2080, RTX 3080, RX 580 2048SP, and P106-100, meaning it can substitute for any of those cards in average workloads.

The AMD Instinct MI455X wins in raw specification comparisons, but only on paper. Its 157.3 TFLOPS FP32, 432 GB memory, and 23.3 TB/s bandwidth are orders of magnitude beyond the Arc B580. Its 2 nm process node and 320,000 million transistors represent a state-of-the-art manufacturing achievement. For data-center compute tasks that do not require display output, such as large-scale matrix operations or memory-bound workloads, the MI455X’s specifications suggest it could handle datasets far larger than the Arc B580’s 12 GB limit. However, the database has no benchmark results to confirm this, and its 2,300 W TDP and EAM Module form factor restrict it to specialized server infrastructure. The MI455X’s 50th percentile rank and zero average score mean it cannot be validated against any real workload in this database. In contrast, the Arc B580’s 68th percentile and 23,021 average score provide concrete evidence of its capabilities. The choice, based strictly on data, is simple: the Arc B580 for any graphics or general-purpose GPU task, and the MI455X only for hypothetical compute deployments where its specification sheet is the sole reference.