AMD Instinct MI455X vs AMD Radeon 860M Comparison

Head-to-Head Benchmarks

The recorded data contains no direct head-to-head benchmark comparisons between the AMD Instinct MI455X and the AMD Radeon 860M. The MI455X has no benchmark entries in the database, yielding an average benchmark score of 0 and a percentile rank of 50 among all GPUs. The Radeon 860M, by contrast, has two recorded benchmark results: a Geekbench OpenCL score of 22,759 and a Geekbench Vulkan score of 30,043, producing an average benchmark score of 26,401 and a percentile rank of 72.

Because the MI455X lacks any measured scores, every quantitative comparison in this analysis derives from the Radeon 860M's recorded results and its nearest rival list. The Radeon 860M sits within a narrow competitive band. Its average score of 26,401 is 0.1% below the NVIDIA GeForce MX550 (26,421), 0.3% above the NVIDIA GeForce RTX 5060 (26,331), 0.6% below the AMD Radeon RX 5700 XT 50th Anniversary (26,553), and 1.1% below the NVIDIA RTX A4000 (26,683). These deltas are all within roughly one percentage point, indicating that the Radeon 860M delivers performance nearly identical to those four discrete GPUs in the database's aggregate metric.

The absence of any benchmark data for the MI455X prevents a direct win/loss tally. The winsA and winsB fields both record zero, confirming that no head-to-head tests exist in the database. This is unusual for a product with such extreme specifications, but the data as recorded simply does not include any measured workload results for the Instinct part. The Radeon 860M's Vulkan score of 30,043 exceeds its OpenCL score of 22,759 by roughly 32%, suggesting that the integrated GPU scales differently across compute APIs, a pattern that reflects its RDNA 3.5 architecture and driver stack.

Architecture Differences

The two AMD parts share a manufacturer but diverge fundamentally in architecture, process technology, and intended role. The Instinct MI455X uses the CDNA 5.0 architecture, built for data center compute, while the Radeon 860M uses RDNA 3.5, designed for mobile integrated graphics. The MI455X is fabricated on a 2 nm process at TSMC, whereas the Radeon 860M uses a 4 nm process, also at TSMC. The MI455X's chip is designated "MI450 256CU" with a die size of 2990 mm² and a transistor count of 320,000 million, yielding a transistor density of 107.0M per mm². The Radeon 860M's chip is "Krackan Point" with unknown die size and transistor count.

The MI455X belongs to the Instinct (MIx) generation and the Radeon Instinct product line, with its predecessor listed as Radeon Instinct. The Radeon 860M belongs to the Navi III IGP (Strix Point Mobile) generation, with its predecessor listed as Navi II IGP. These generational names reflect different lineages: one for accelerator cards, one for integrated processors.

Compute resources differ by an order of magnitude. The MI455X has 32,768 shading units, 1,024 texture mapping units, and 0 ROPs, while the Radeon 860M has 512 shading units, 32 TMUs, and 16 ROPs. The MI455X lists no ray tracing cores, while the Radeon 860M includes 8. Neither part lists tensor cores. The MI455X's pixel rate is recorded as 0 MPixel/s, consistent with its lack of display outputs, while the Radeon 860M achieves 48.00 GPixel/s. Texture rates are 2,457.6 GTexel/s for the MI455X versus 96.00 GTexel/s for the Radeon 860M.

Memory architecture could not be more different. The MI455X carries 432 GB of HBM4 on a 24,576-bit bus, delivering 23.3 TB/s of bandwidth. The Radeon 860M uses system shared memory with system-dependent bandwidth. Clock behavior also diverges: the MI455X runs at a 1000 MHz base and 2400 MHz boost with memory at 1900 MHz (7.6 Gbps effective), while the Radeon 860M runs at a 600 MHz base and 3000 MHz boost with system shared memory.

API support separates them sharply. The MI455X lists N/A for DirectX, OpenGL, and Vulkan. The Radeon 860M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. This confirms the MI455X is a compute-only accelerator with no graphics pipeline, while the Radeon 860M is a full graphics and compute IGP.

FAQ

Q: Which GPU has the higher average benchmark score?

A: Only the AMD Radeon 860M has recorded benchmark scores. Its average is 26,401, with a Geekbench OpenCL score of 22,759 and a Geekbench Vulkan score of 30,043. The AMD Instinct MI455X has no benchmark entries and an average score of 0.

Q: How does the Radeon 860M compare to its nearest rivals?

A: The Radeon 860M's average score of 26,401 is 0.1% below the NVIDIA GeForce MX550, 0.3% above the NVIDIA GeForce RTX 5060, 0.6% below the AMD Radeon RX 5700 XT 50th Anniversary, and 1.1% below the NVIDIA RTX A4000.

Q: What are the process node differences?

A: The Instinct MI455X is fabricated on a 2 nm process at TSMC. The Radeon 860M uses a 4 nm process, also at TSMC. The MI455X has a die size of 2990 mm² with 320,000 million transistors, while the Radeon 860M's die size and transistor count are unknown.

Q: Do both GPUs support the same graphics APIs?

A: No. The Radeon 860M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Instinct MI455X lists N/A for all three APIs, indicating no graphics API support.

Q: What is the memory configuration of each GPU?

A: The Instinct MI455X has 432 GB of HBM4 memory on a 24,576-bit bus with 23.3 TB/s bandwidth. The Radeon 860M uses system shared memory with system-dependent bandwidth.

Q: Which GPU has a higher boost clock?

A: The Radeon 860M has a boost clock of 3000 MHz, while the Instinct MI455X has a boost clock of 2400 MHz. The MI455X has a higher base clock at 1000 MHz versus 600 MHz for the Radeon 860M.

Specification Differences

The two AMD products differ across nearly every specification field. Process node: the MI455X uses 2 nm, the Radeon 860M uses 4 nm. Transistor count: the MI455X has 320,000 million, the Radeon 860M is unknown. Die size: the MI455X is 2990 mm², the Radeon 860M is unknown. Transistor density: 107.0M / mm² for the MI455X, null for the Radeon 860M.

Clock speeds: the MI455X has a 1000 MHz base and 2400 MHz boost, the Radeon 860M has a 600 MHz base and 3000 MHz boost. Memory clocks: the MI455X runs at 1900 MHz (7.6 Gbps effective), the Radeon 860M uses system shared memory.

Memory capacity: 432 GB versus system shared. Memory type: HBM4 versus system shared. Bus width: 24,576 bit versus system shared. Bandwidth: 23.3 TB/s versus system dependent.

Shading units: 32,768 versus 512. TMUs: 1,024 versus 32. ROPs: 0 versus 16. Ray tracing cores: none listed versus 8. Pixel rate: 0 MPixel/s versus 48.00 GPixel/s. Texture rate: 2,457.6 GTexel/s versus 96.00 GTexel/s. FP32 compute: 157.3 TFLOPS versus 3.072 TFLOPS. FP16 compute: 157.3 TFLOPS (1:1) versus 3.072 TFLOPS (1:1).

TDP: 2300 W versus 15 W. Slot width: EAM Module versus IGP. Power connectors: None for both. Suggested PSU: 2700 W for the MI455X, null for the Radeon 860M. Bus interface: PCIe 6.0 x16 versus PCIe 4.0 x8. Display outputs: No outputs versus Portable Device Dependent.

API support: N/A for all three APIs on the MI455X versus DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 on the Radeon 860M. Release date: 2026-07-22 for the MI455X versus 2025-02-28 for the Radeon 860M. Production status: null for the MI455X versus Active for the Radeon 860M. Both have null launch MSRP fields.

The Verdict

The database records no overlapping benchmarks, so a conventional performance verdict is impossible. Instead, the data supports a role-based verdict. The Instinct MI455X is a data center compute accelerator with CDNA 5.0 architecture, 32,768 shading units, 432 GB of HBM4, 23.3 TB/s bandwidth, and 157.3 TFLOPS of FP32 and FP16 compute. It has no display outputs, no graphics API support, and a 2300 W TDP with a 2700 W suggested PSU. This part is engineered for massive parallel workloads where graphics output is irrelevant.

The Radeon 860M is a mobile integrated GPU with RDNA 3.5, 512 shading units, 8 ray tracing cores, 16 ROPs, full DirectX 12 Ultimate support, and a 15 W TDP. Its benchmark scores place it within 1.1% of four discrete GPUs from NVIDIA and AMD, including the RTX A4000 and RX 5700 XT 50th Anniversary. Its 72nd percentile rank among all GPUs indicates solid mainstream performance for an integrated part.

The MI455X's 0 benchmark scores and 50th percentile rank reflect missing data, not measured performance. The Radeon 860M's 72nd percentile and 26,401 average score reflect actual recorded results. For compute density, the MI455X delivers 51.2 times the FP32 throughput of the Radeon 860M (157.3 TFLOPS versus 3.072 TFLOPS) and 153.3 times the texture rate (2,457.6 GTexel/s versus 96.00 GTexel/s). For graphics features, only the Radeon 860M has any.

Where Each One Wins

The Instinct MI455X wins on raw compute scale. Its FP32 and FP16 throughput of 157.3 TFLOPS dwarfs the Radeon 860M's 3.072 TFLOPS. Its 2,457.6 GTexel/s texture rate exceeds the Radeon 860M's 96.00 GTexel/s by a factor of 25.6. Its 432 GB of HBM4 with 23.3 TB/s bandwidth provides memory capacity and bandwidth that no integrated GPU can approach. The MI455X also wins on process technology with a 2 nm node versus 4 nm, and on bus interface with PCIe 6.0 x16 versus PCIe 4.0 x8.

The Radeon 860M wins on graphics capability. It offers 16 ROPs, 8 ray tracing cores, and a 48.00 GPixel/s pixel rate, while the MI455X has 0 ROPs and a 0 MPixel/s pixel rate. The Radeon 860M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4; the MI455X lists N/A for all. The Radeon 860M also wins on clock speed with a 3000 MHz boost versus 2400 MHz, and on power efficiency with a 15 W TDP versus 2300 W.

The Radeon 860M wins on measured benchmark performance because it has any at all. Its Geekbench Vulkan score of 30,043 and OpenCL score of 22,759 are the only recorded numbers in the database. Its 72nd percentile rank versus the MI455X's 50th percentile (with no benchmarks) means the database currently places the integrated GPU above the accelerator in percentile terms. The Radeon 860M also wins on production status, listed as Active, while the MI455X has no production status recorded, and on release date, arriving on 2025-02-28 versus the MI455X's 2026-07-22.

The MI455X wins on shading units (32,768 versus 512), TMUs (1,024 versus 32), memory bandwidth (23.3 TB/s versus system dependent), and memory bus width (24,576 bit versus system shared). Its transistor count of 320,000 million and die size of 2990 mm² are recorded, while the Radeon 860M's are unknown. The MI455X has a higher base clock (1000 MHz versus 600 MHz) and a higher TDP, which reflects its accelerator role rather than a portable IGP role.

In short, the MI455X wins every compute-oriented specification, while the Radeon 860M wins every graphics-oriented specification and all recorded benchmark results. The data presents two AMD products with opposite design priorities, and the database contains no common workload to bridge them.