AMD Instinct MI455X vs Intel Arc Pro B70 Comparison

Head-to-Head Benchmarks

The recorded data contains no direct head-to-head benchmark results for the AMD Instinct MI455X and the Intel Arc Pro B70. Both entries show an average benchmark score of 0, and neither lists any wins in comparative testing. The percentile versus all GPUs is identical for both at 50, placing them at the median of the database's tracked graphics processors, though this is a relative ranking rather than a measured performance outcome.

What the data does provide is a clear separation in raw compute specifications. The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance, which is 6.9 times the 22.94 TFLOPS offered by the Intel Arc Pro B70. In FP16 workloads, the MI455X again outputs 157.3 TFLOPS with a 1:1 ratio, while the Arc Pro B70 reaches 45.88 TFLOPS using a 2:1 ratio. The AMD part is 3.4 times faster in FP16, but the Intel card's 2:1 ratio means it is processing two FP16 operations per clock, whereas the AMD card processes one FP16 per clock at the same rate as its FP32 throughput.

Texture processing follows a similar pattern. The MI455X achieves 2,457.6 GTexel/s, compared to 716.8 GTexel/s for the Arc Pro B70, a 3.4 times advantage. Pixel throughput tells a different story entirely: the MI455X reports 0 MPixel/s with 0 ROPs, meaning it has no fixed-function pixel output stages, while the Arc Pro B70 delivers 358.4 GPixel/s from 128 ROPs. This reflects the fundamental design split between an accelerator module and a graphics card.

Memory bandwidth heavily favors the AMD part. The MI455X uses HBM4 across a 24,576-bit bus to reach 23.3 TB/s, while the Arc Pro B70 uses GDDR6 across a 256-bit bus for 608.0 GB/s. The MI455X has 38.3 times the memory bandwidth. Capacity follows the same direction: 432 GB versus 32 GB, a 13.5 times difference.

The Verdict

The data indicates two devices built for different roles. The AMD Instinct MI455X is a compute accelerator with no display outputs, no render output units, and no graphics API support (DirectX, OpenGL, and Vulkan are all listed as N/A). Its 2,300 W TDP and 2,700 W suggested PSU requirement, combined with an EAM Module slot width and no power connectors, point to a rack-mounted data center part. The Intel Arc Pro B70, by contrast, is a conventional dual-slot graphics card with 1x HDMI 2.1a and 3x DisplayPort 2.1 outputs, a 230 W TDP, a single 8-pin power connector, and a 550 W suggested PSU. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

For compute-heavy workloads, the MI455X is the stronger choice based on FP32 and FP16 throughput, memory bandwidth, and memory capacity. For graphics rendering, display output, and rasterization, the Arc Pro B70 is the only one of the two with the necessary hardware. The MI455X cannot drive a display and has no pixel pipeline, so it is not an alternative for workstation graphics. The Arc Pro B70, while far lower in raw compute, is the only option here for any task requiring a visible output or standard graphics API support.

The release dates also separate the products. The Arc Pro B70 launched on 2026-03-25, while the MI455X arrived on 2026-07-22, roughly four months later. The MI455X uses a 2 nm process from TSMC, while the Arc Pro B70 uses a 5 nm process, also from TSMC. The MI455X has a die size of 2,990 mm², versus 368 mm² for the Arc Pro B70. The MI455X integrates 320,000 million transistors, giving it a density of 107.0 million per mm². The Arc Pro B70's transistor count is listed as unknown.

Architecture Differences

The AMD Instinct MI455X is built on the CDNA 5.0 architecture, which is designed for compute acceleration. It uses the MI450 256CU chip, which contains 32,768 shading units, 1,024 texture mapping units, and 0 ROPs. The absence of ROPs and the N/A entries for DirectX, OpenGL, and Vulkan indicate that the architecture omits the graphics pipeline entirely. The MI455X has no ray tracing cores listed, and no tensor cores are specified. Its FP16 performance is 1:1 with FP32, meaning each shader processes one FP16 operation per clock, the same as FP32.

The Intel Arc Pro B70 is built on the Xe2-HPG architecture, with the BMG-G31 chip. It has 4,096 shading units, 256 TMUs, 128 ROPs, and 32 ray tracing cores. The FP16 rate is 2:1 relative to FP32, meaning the hardware processes two FP16 operations per clock per shader. This is a common graphics architecture trait, where half-precision throughput is double that of full-precision. The Arc Pro B70 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, which are standard graphics APIs. Ray tracing support is present through the 32 dedicated cores.

The process nodes differ: 2 nm for the MI455X, 5 nm for the Arc Pro B70, both fabricated by TSMC. The MI455X's die is 2,990 mm², which is 8.1 times the size of the Arc Pro B70's 368 mm² die. The transistor density for the MI455X is 107.0 million per mm², but no density figure is available for the Arc Pro B70. The MI455X's transistor count is 320,000 million, while the Arc Pro B70's count is unknown.

Specification Differences

The two parts differ across nearly every specification field. Clock speeds: the MI455X has a base clock of 1,000 MHz and a boost clock of 2,400 MHz, while the Arc Pro B70 runs at 2,280 MHz base and 2,800 MHz boost. The Arc Pro B70 has a higher base clock by 1,280 MHz and a higher boost clock by 400 MHz. Memory clocks: the MI455X operates at 1,900 MHz (7.6 Gbps effective), while the Arc Pro B70 runs at 2,375 MHz (19 Gbps effective).

Memory type and configuration: the MI455X uses HBM4 with 432 GB capacity, a 24,576-bit bus, and 23.3 TB/s bandwidth. The Arc Pro B70 uses GDDR6 with 32 GB capacity, a 256-bit bus, and 608.0 GB/s bandwidth. The MI455X has no display outputs; the Arc Pro B70 has 1x HDMI 2.1a and 3x DisplayPort 2.1.

Power and physical specifications: the MI455X has a TDP of 2,300 W, a suggested PSU of 2,700 W, an EAM Module slot width, and no power connectors. The Arc Pro B70 has a TDP of 230 W, a suggested PSU of 550 W, a dual-slot design, and a single 8-pin power connector. The MI455X has no listed dimensions, while the Arc Pro B70 measures 267 mm in length, 110 mm in height, and 39 mm in width.

Bus interface: the MI455X uses PCIe 6.0 x16, while the Arc Pro B70 uses PCIe 5.0 x16. The MI455X has no launch MSRP listed, while the Arc Pro B70 has a launch MSRP of 949 USD. The MI455X lists its predecessor as Radeon Instinct, while the Arc Pro B70 has no predecessor listed. Neither has a listed successor.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32, which is 6.9 times the 22.94 TFLOPS of the Intel Arc Pro B70.

Q: Does the AMD Instinct MI455X support display outputs?

A: No, the MI455X lists no display outputs, while the Intel Arc Pro B70 includes 1x HDMI 2.1a and 3x DisplayPort 2.1.

Q: What is the memory bandwidth difference between the two?

A: The MI455X reaches 23.3 TB/s via HBM4 on a 24,576-bit bus, while the Arc Pro B70 reaches 608.0 GB/s via GDDR6 on a 256-bit bus. The MI455X has 38.3 times the bandwidth.

Q: Which GPU has ray tracing support?

A: The Intel Arc Pro B70 has 32 ray tracing cores. The AMD Instinct MI455X lists no ray tracing cores and has N/A for DirectX, OpenGL, and Vulkan support.

Q: What are the TDP requirements?

A: The MI455X has a TDP of 2,300 W with a suggested PSU of 2,700 W, while the Arc Pro B70 has a TDP of 230 W with a suggested PSU of 550 W.

Q: Which GPU was released first?

A: The Intel Arc Pro B70 was released on 2026-03-25, and the AMD Instinct MI455X was released on 2026-07-22.