AMD Instinct MI455X vs Intel UHD Graphics 770 Mobile Comparison

Where Each One Wins

The AMD Instinct MI455X and Intel UHD Graphics 770 Mobile occupy entirely different segments of the GPU market, and the recorded data confirms that their respective strengths are almost mutually exclusive. The MI455X is a compute-oriented accelerator with no display outputs, no graphics API support, and a 2300 W TDP. The UHD Graphics 770 Mobile is a 15 W integrated processor graphics solution with full DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4 support, designed for portable devices with system-shared memory.

In raw throughput metrics, the MI455X dominates every computational category. It delivers 157.3 TFLOPS of FP32 performance, compared to 819.2 GFLOPS for the Intel part. That represents a 192-fold advantage in single-precision floating-point throughput. The texture rate tells a similar story: the MI455X reaches 2,457.6 GTexel/s, while the UHD Graphics 770 Mobile manages 25.60 GTexel/s. The AMD part is roughly 96 times faster in texture fill. The pixel rate comparison is less straightforward because the MI455X reports 0 MPixel/s, a result of its lack of traditional raster output units, while the Intel part achieves 12.80 GPixel/s through its 8 ROPs.

Memory bandwidth is another decisive win for the AMD accelerator. The MI455X uses 432 GB of HBM4 memory across a 24576-bit bus, yielding 23.3 TB/s of bandwidth. The Intel part uses system-shared memory with bandwidth listed as system dependent. No fixed bandwidth figure is recorded for the Intel solution, so a direct numeric delta cannot be computed from the database, but the architectural gulf is evident from the memory interface widths and memory types.

Clock behavior also differs. The MI455X has a 1000 MHz base clock and a 2400 MHz boost clock. The UHD Graphics 770 Mobile runs at a 300 MHz base and 1600 MHz boost. The AMD part boosts 50% higher than the Intel part's maximum, and its base clock is over three times the Intel base clock.

The wins are therefore split by workload type. For compute-heavy, high-throughput parallel workloads such as dense FP32 or FP16 math, the MI455X is the clear winner in every measured metric. For graphics rendering in portable devices, the UHD Graphics 770 Mobile is the only one of the two with any display capability, as the MI455X has no outputs and no supported graphics APIs.

Architecture Differences

The two products could hardly be more different at the architectural level. The AMD Instinct MI455X uses the CDNA 5.0 architecture, built on a 2 nm TSMC process. It integrates 320,000 million transistors on a 2990 mm² die, yielding a transistor density of 107.0M per mm². The chip is designated "MI450 256CU," indicating 256 compute units. The Intel UHD Graphics 770 Mobile uses the Generation 12.2 architecture, built on a 10 nm Intel process. The database records no transistor count, die size, or transistor density for the Intel part.

Shader resources differ enormously. The MI455X has 32,768 shading units, 1,024 texture mapping units, and 0 ROPs. The UHD Graphics 770 Mobile has 256 shading units, 16 TMUs, and 8 ROPs. The MI455X has 128 times more shading units and 64 times more TMUs, but the Intel part has the only ROPs in this comparison. Neither product lists ray tracing cores or tensor cores in the database.

Memory architecture is fundamentally different. The MI455X uses 432 GB of HBM4 with a 24576-bit bus and memory clocks of 1900 MHz, 7.6 Gbps effective. The UHD Graphics 770 Mobile uses system-shared memory with a system-shared bus width and system-dependent bandwidth, with no dedicated memory clock recorded.

Power and physical design separate the two even further. The MI455X has a 2300 W TDP, uses an EAM Module slot width, has no power connectors listed, and requires a suggested PSU of 2700 W. It connects via PCIe 6.0 x16. The UHD Graphics 770 Mobile has a 15 W TDP, is an IGP, uses a Ring Bus interface, and has no suggested PSU listed because it draws from the host platform.

API support is a stark differentiator. The MI455X records N/A for DirectX, OpenGL, and Vulkan. The Intel part supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4. Display outputs are also opposite: the MI455X has no outputs, while the Intel part's outputs are portable device dependent.

The MI455X belongs to the Instinct (MIx) generation, with a predecessor of Radeon Instinct and a release date of 2026-07-22. The Intel part belongs to HD Graphics-M (Raptor Lake), has a release date of 2023-01-03, and lists Arc Graphics-M as its successor. The Intel part is marked as active production status, while the MI455X has no production status recorded.

The Verdict

The recorded data indicates that these two products should not be considered direct competitors. The AMD Instinct MI455X is a compute accelerator with no display path and no graphics API support, built for massive parallel throughput. The Intel UHD Graphics 770 Mobile is an integrated graphics solution for portable devices, with full graphics API support and display connectivity.

From the data, the MI455X should be selected for workloads that demand extreme FP32 and FP16 throughput, massive memory capacity, and enormous bandwidth. Its 157.3 TFLOPS FP32 rating, 157.3 TFLOPS FP16 rating, 432 GB HBM4 memory, and 23.3 TB/s bandwidth position it for large-scale compute tasks. The lack of display outputs and graphics APIs means it is not suitable for conventional graphics rendering.

The UHD Graphics 770 Mobile should be selected for portable systems where a 15 W integrated GPU with DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4 support is required. Its 12.80 GPixel/s pixel rate, 25.60 GTexel/s texture rate, and 819.2 GFLOPS FP32 are modest figures, but the part provides display outputs on portable devices and runs on the Ring Bus interface without additional power connectors.

Both products sit at the 50th percentile versus all GPUs in the database, with an average benchmark score of 0 for both. Neither has recorded head-to-head benchmark results, and neither has nearest rival data. The data does not support a claim that one is "better" in absolute terms; it supports a functional split based on workload and platform requirements.

FAQ

Q: Which GPU has higher FP32 performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance. The Intel UHD Graphics 770 Mobile delivers 819.2 GFLOPS. The MI455X is approximately 192 times faster in FP32.

Q: Does the AMD Instinct MI455X support display outputs?

A: No. The database records "No outputs" for the MI455X and lists DirectX, OpenGL, and Vulkan as N/A. The Intel UHD Graphics 770 Mobile supports display outputs described as portable device dependent.

Q: What memory does each GPU use?

A: The MI455X uses 432 GB of HBM4 memory with a 24576-bit bus and 23.3 TB/s bandwidth. The UHD Graphics 770 Mobile uses system-shared memory with a system-shared bus width and system-dependent bandwidth.

Q: What are the TDP values?

A: The AMD Instinct MI455X has a 2300 W TDP and a suggested PSU of 2700 W. The Intel UHD Graphics 770 Mobile has a 15 W TDP and no suggested PSU listed.

Q: Which GPU supports DirectX 12?

A: The Intel UHD Graphics 770 Mobile supports DirectX 12 (12_1), OpenGL 4.6, and Vulkan 1.4. The AMD Instinct MI455X records N/A for all three graphics APIs.

Q: What process nodes are used?

A: The MI455X is built on a 2 nm TSMC process. The UHD Graphics 770 Mobile is built on a 10 nm Intel process.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results between these two products, and neither has individual benchmark scores or nearest rival data. The comparison must therefore rely on the recorded specifications and theoretical throughput figures.

The largest win for the MI455X is in FP32 throughput. The AMD part achieves 157.3 TFLOPS, while the Intel part achieves 819.2 GFLOPS. Converting the Intel figure to TFLOPS gives 0.8192 TFLOPS. The ratio is 192.0 times in favor of the AMD part. This is the single biggest gap in any comparable metric.

FP16 throughput shows a different relationship because of their respective ratios. The MI455X delivers 157.3 TFLOPS FP16 at a 1:1 ratio with FP32. The UHD Graphics 770 Mobile delivers 1.638 TFLOPS FP16 at a 2:1 ratio with FP32. The MI455X is approximately 96 times faster in FP16.

Texture rate favors the MI455X by a factor of 96.0. The AMD part reaches 2,457.6 GTexel/s from its 1,024 TMUs and 2400 MHz boost clock. The Intel part reaches 25.60 GTexel/s from its 16 TMUs and 1600 MHz boost clock.

Pixel rate is the only metric where the Intel part has a non-zero recorded value. The UHD Graphics 770 Mobile achieves 12.80 GPixel/s from its 8 ROPs. The MI455X records 0 MPixel/s because it has 0 ROPs. This is a complete reversal of the other throughput comparisons, though the practical significance is limited because the MI455X has no display outputs and no graphics API support.

Memory bandwidth cannot be directly compared numerically because the Intel part's bandwidth is listed as system dependent, not a fixed number. The MI455X records 23.3 TB/s over a 24576-bit HBM4 bus. The Intel part's system-shared memory bandwidth depends on the host platform.

Clock speeds show a clear edge for the AMD part. The MI455X has a 1000 MHz base and 2400 MHz boost. The Intel part has a 300 MHz base and 1600 MHz boost. The boost clock difference is 800 MHz in favor of the AMD part, and the base clock difference is 700 MHz.

Shading unit count favors the MI455X at 32,768 versus 256, a 128-fold difference. TMU count favors the MI455X at 1,024 versus 16, a 64-fold difference. ROP count favors the Intel part at 8 versus 0. These resource differences align with the throughput deltas recorded in the database.

The bus interface differs as well. The MI455X uses PCIe 6.0 x16, while the Intel part uses a Ring Bus. The MI455X is an EAM Module with no power connectors, while the Intel part is an IGP with no power connectors listed. The MI455X requires a 2700 W suggested PSU; the Intel part has none listed.

Both products share the same percentile rank of 50 versus all GPUs, and both have an average benchmark score of 0. The absence of actual benchmark measurements means the database can only report theoretical peak figures. The theoretical data shows a massive compute advantage for the MI455X and a graphics capability advantage for the UHD Graphics 770 Mobile, with no overlap in their intended usage models.