AMD Instinct MI455X vs Intel Arc B770 Comparison

The Verdict

The recorded data places these two accelerators in entirely different performance classes despite an identical 50th percentile ranking among all GPUs and zero head-to-head benchmark results. The AMD Instinct MI455X is a compute-oriented accelerator with an enormous 432 GB memory pool, a 24576-bit bus, and 157.3 TFLOPS of FP32 throughput. The Intel Arc B770 is a conventional graphics card with 16 GB of memory, a 256-bit bus, and 19.66 TFLOPS of FP32 performance. Nothing in the database suggests these products compete for the same workload. The MI455X targets large-scale data center compute where memory capacity and raw throughput dominate. The B770 targets client-side rendering and general-purpose graphics with standard display outputs and full API support. Users requiring a display output should select the B770, as the MI455X provides no outputs. Users needing massive memory capacity and extreme compute density should select the MI455X. The data indicates no scenario where both cards satisfy the same requirement.

Architecture Differences

The two products diverge at every architectural level. The MI455X uses the CDNA 5.0 architecture built on a 2 nm TSMC process, while the B770 uses Xe2-HPG (Battlemage) on a 5 nm TSMC process. The MI455X integrates 320,000 million transistors across a 2990 mm² die, resulting in a transistor density of 107.0M per mm². The B770's transistor count is listed as unknown, but its die size is 368 mm². The MI455X belongs to the Instinct (MIx) generation, whereas the B770 belongs to the Battlemage (Arc 7) generation. The MI455X uses HBM4 memory with 432 GB capacity, 24576-bit bus width, and 23.3 TB/s bandwidth. The B770 uses GDDR6 with 16 GB capacity, 256-bit bus width, and 512.0 GB/s bandwidth. The MI455X contains 32768 shading units, 1024 texture mapping units, and zero ROPs. The B770 contains 4096 shading units, 256 TMUs, and 128 ROPs. The MI455X has no ray tracing cores listed, while the B770 has 32. The MI455X has no display outputs and no API support for DirectX, OpenGL, or Vulkan. The B770 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI455X uses a PCIe 6.0 x16 interface, while the B770 uses PCIe 4.0 x16. The MI455X is an EAM Module with no power connectors and no specified slot dimensions. The B770 is a dual-slot card with 1x 6-pin and 1x 8-pin connectors.

FAQ

Q: Which card has more memory bandwidth?

A: The AMD Instinct MI455X provides 23.3 TB/s of memory bandwidth, which is over 45 times the 512.0 GB/s available on the Intel Arc B770.

Q: Can the MI455X drive a display?

A: No. The MI455X lists no display outputs and has no DirectX, OpenGL, or Vulkan API support. The B770 provides 1x HDMI 2.1a and 3x DisplayPort 2.1 outputs.

Q: What is the FP32 performance difference?

A: The MI455X delivers 157.3 TFLOPS of FP32 compute, which is exactly 8 times the 19.66 TFLOPS of the B770. The MI455X also offers FP16 at 157.3 TFLOPS (1:1), while the B770 offers 39.32 TFLOPS (2:1).

Q: How do power requirements compare?

A: The MI455X has a 2300 W TDP and recommends a 2700 W power supply. The B770 has a 225 W TDP and recommends a 550 W power supply.

Q: Which card is newer?

A: The B770 has a release date of 2025-12-31, while the MI455X has a release date of 2026-07-22. The MI455X is newer by about seven months.

Q: Do these cards have any benchmark data in the database?

A: Both cards show an average benchmark score of 0 and no head-to-head benchmark results. Their percentile ranking against all GPUs is 50 for both, but this is based on no recorded measurements.

Specification Differences

The two cards differ in every major specification category. The process node is 2 nm for the MI455X versus 5 nm for the B770. Transistor count is 320,000 million for the MI455X versus unknown for the B770. Die size is 2990 mm² versus 368 mm². Transistor density is 107.0M per mm² for the MI455X versus null for the B770. Base clock is 1000 MHz versus 2100 MHz. Boost clock is identical at 2400 MHz for both. Memory clock is 1900 MHz (7.6 Gbps effective) versus 2000 MHz (16 Gbps effective). Memory size is 432 GB versus 16 GB. Memory type is HBM4 versus GDDR6. Bus width is 24576 bit versus 256 bit. Bandwidth is 23.3 TB/s versus 512.0 GB/s. Shading units are 32768 versus 4096. TMUs are 1024 versus 256. ROPs are 0 versus 128. RT cores are null versus 32. Pixel rate is 0 MPixel/s versus 307.2 GPixel/s. Texture rate is 2,457.6 GTexel/s versus 614.4 GTexel/s. FP32 is 157.3 TFLOPS versus 19.66 TFLOPS. FP16 is 157.3 TFLOPS (1:1) versus 39.32 TFLOPS (2:1). TDP is 2300 W versus 225 W. Slot width is EAM Module versus dual-slot. Power connectors are none versus 1x 6-pin plus 1x 8-pin. Suggested PSU is 2700 W versus 550 W. Bus interface is PCIe 6.0 x16 versus PCIe 4.0 x16. Display outputs are none versus 1x HDMI 2.1a and 3x DisplayPort 2.1. DirectX support is N/A versus 12 Ultimate (12_2). OpenGL is N/A versus 4.6. Vulkan is N/A versus 1.4. Predecessor is Radeon Instinct versus Alchemist. Release date is 2026-07-22 versus 2025-12-31.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark results between these two products. Both cards show an average benchmark score of 0, and the wins counter for each is 0. The percentile ranking against all GPUs is 50 for both, but this figure lacks supporting measurements. The absence of recorded benchmark data means no direct performance comparison can be drawn from the database. However, the specification differences provide clear quantitative deltas. The MI455X offers 8 times the FP32 throughput (157.3 TFLOPS versus 19.66 TFLOPS) and 4 times the FP16 throughput (157.3 versus 39.32 TFLOPS). The MI455X provides 27 times the memory capacity (432 GB versus 16 GB) and roughly 45.5 times the memory bandwidth (23.3 TB/s versus 512.0 GB/s). The texture rate of the MI455X is 4 times higher (2,457.6 GTexel/s versus 614.4 GTexel/s). The B770 counters with a pixel rate of 307.2 GPixel/s, whereas the MI455X has 0 MPixel/s. The B770 also has 32 ray tracing cores, while the MI455X lists none. The B770 boosts to 2400 MHz just like the MI455X, but its base clock is 2100 MHz versus 1000 MHz, and its memory operates at 16 Gbps effective versus 7.6 Gbps. The B770's PCIe 4.0 x16 interface is two generations behind the MI455X's PCIe 6.0 x16.

Where Each One Wins

The MI455X wins decisively in compute throughput, memory capacity, memory bandwidth, and texture processing. Its 432 GB HBM4 memory with 23.3 TB/s bandwidth suits workloads that require massive datasets resident on the accelerator. Its 157.3 TFLOPS FP32 and FP16 (1:1) performance positions it for dense numerical computation. The 32768 shading units and 1024 TMUs provide a 4:1 advantage over the B770 in both categories. The CDNA 5.0 architecture and 2 nm process node indicate a design optimized for maximum compute density per watt, even though the absolute TDP is 2300 W. The PCIe 6.0 x16 interface offers the latest host connectivity. The MI455X wins in any scenario that demands raw compute or enormous memory capacity.

The B770 wins in every graphics-oriented category. Its 128 ROPs deliver a pixel rate of 307.2 GPixel/s, which is essential for rasterization. Its 32 ray tracing cores enable hardware-accelerated ray tracing, a feature entirely absent from the MI455X's specification list. The B770 provides full API support including DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it usable for gaming, content creation, and general-purpose graphics. Its display outputs (1x HDMI 2.1a, 3x DisplayPort 2.1) allow direct monitor connection. The B770's 225 W TDP and 550 W suggested PSU make it feasible for standard desktop systems, whereas the MI455X's 2300 W TDP and 2700 W suggested PSU require specialized infrastructure. The B770's higher base clock (2100 MHz versus 1000 MHz) and faster effective memory clock (16 Gbps versus 7.6 Gbps) indicate a design tuned for latency-sensitive graphics workloads. The B770 wins in any scenario that requires a display output, graphics API compatibility, or ray tracing capability. The database shows two accelerators with no overlap in their intended use cases.