AMD Instinct MI455X vs AMD Radeon RX 7600M Comparison

AMD Instinct MI455X and AMD Radeon RX 7600M occupy opposite ends of the AMD GPU spectrum, one a massive accelerator for compute installations and the other a compact mobile graphics processor. The recorded data shows a stark contrast in nearly every measurable specification, from die size and memory configuration to power envelope and intended integration. The MI455X carries the CDNA 5.0 architecture on a 2 nm process with 320,000 million transistors, while the RX 7600M uses RDNA 3.0 on a 6 nm node with 13,300 million transistors. These are not competing products in the conventional sense, but the database comparison highlights how far the two designs diverge in purpose and capability.

Where Each One Wins

The AMD Instinct MI455X wins decisively in raw compute throughput. Its FP32 performance is 157.3 TFLOPS, compared to 17.27 TFLOPS for the RX 7600M, a difference of roughly 9.1 times. Texture rate follows a similar pattern, with the MI455X delivering 2,457.6 GTexel/s versus 269.9 GTexel/s for the mobile chip. The MI455X also dominates memory specifications, offering 432 GB of HBM4 on a 24576-bit bus with 23.3 TB/s bandwidth, whereas the RX 7600M has 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s. Any workload that scales with FP32 compute, memory capacity, or memory bandwidth will favor the Instinct part overwhelmingly.

The AMD Radeon RX 7600M wins in areas related to graphics output and practical system integration. It has 64 ROPs and a pixel rate of 154.2 GPixel/s, while the MI455X has zero ROPs and a pixel rate of 0 MPixel/s. The RX 7600M also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, whereas the MI455X reports N/A for all three APIs. Display outputs on the RX 7600M are portable device dependent, but at least they exist; the MI455X has no display outputs at all. The RX 7600M also carries a far lower power draw at 90 W versus 2300 W, making it suitable for systems with modest power delivery.

The benchmark data shows the RX 7600M has an average benchmark score of 63775 in Geekbench OpenCL and sits at the 89th percentile among all GPUs. The MI455X has no recorded benchmarks, an average score of 0, and a 50th percentile ranking. For the only available measured workload, the mobile part wins by default, although that workload is a general compute test rather than a data center scale task.

Architecture Differences

The MI455X uses the CDNA 5.0 architecture, built on a 2 nm process at TSMC. Its die size is 2990 mm², which is enormous, and it packs 320,000 million transistors for a density of 107.0M per mm². The chip is labeled MI450 256CU, indicating 256 compute units. It has 32768 shading units and 1024 TMUs, but zero ROPs. The architecture is clearly optimized for compute throughput rather than rasterization, which explains the absence of pixel output capabilities. The memory subsystem uses HBM4 with a 24576-bit bus, a configuration that prioritizes bandwidth above all else. The power envelope is 2300 W, with a suggested PSU of 2700 W, and it mounts as an EAM Module with no power connectors of its own.

The RX 7600M uses the RDNA 3.0 architecture on a 6 nm TSMC process, with a die size of 204 mm² and 13,300 million transistors. Transistor density is 65.2M per mm², lower than the MI455X despite the smaller node advantage of the latter. The chip is Navi 33 with the codename Hotpink Bonefish. It has 1792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores. The architecture supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it a full graphics solution. Memory is 8 GB of GDDR6 on a 128-bit bus, which is modest but appropriate for a 90 W mobile part. It is an IGP form factor with no power connectors and no suggested PSU rating.

The process node difference is significant: 2 nm versus 6 nm. The MI455X also has a much higher transistor density, 107.0M per mm² versus 65.2M per mm², which reflects both the newer node and the different design philosophy. The MI455X has no ray tracing cores listed, while the RX 7600M has 28. The MI455X has no APIs listed, while the RX 7600M has a full API stack. These differences confirm that the two chips are built for entirely different workloads.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark results between these two products. The only benchmark score available is for the RX 7600M, which records 63775 in Geekbench OpenCL. That score places it at the 89th percentile among all GPUs, with nearest rivals including the AMD Radeon RX 9060 XT LP at 63830 (0.1% higher), the NVIDIA CMP 30HX at 63842 (0.1% higher), the AMD Radeon Pro Vega 56 at 63693 (0.1% lower), and the AMD Radeon Pro WX 9100 at 64212 (0.7% higher). These deltas are all within 1%, indicating that the RX 7600M sits in a tightly clustered performance band for this particular test.

The MI455X has no benchmark entries, so its measured performance cannot be compared directly. Its specifications suggest massive compute capability, but the absence of recorded benchmark data means the database cannot confirm real-world performance relative to the RX 7600M. The FP32 figure of 157.3 TFLOPS is over nine times the RX 7600M's 17.27 TFLOPS, and the memory bandwidth of 23.3 TB/s is roughly 91 times higher than the 256.0 GB/s of the mobile part. These specification differences are the primary basis for comparison, since no measured scores exist for the Instinct card.

The RX 7600M also shows a 2:1 FP16 ratio, delivering 34.55 TFLOPS, while the MI455X delivers 157.3 TFLOPS in FP16 with a 1:1 ratio. The MI455X does not gain a throughput advantage in FP16, while the RX 7600M doubles its FP32 rate when using FP16. This architectural difference matters for workloads that can exploit reduced precision.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS, while the AMD Radeon RX 7600M delivers 17.27 TFLOPS. The MI455X is approximately 9.1 times faster in FP32.

Q: Does the MI455X support graphics APIs?

A: No. The MI455X lists DirectX, OpenGL, and Vulkan as N/A. The RX 7600M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What memory configuration does each GPU use?

A: The MI455X uses 432 GB of HBM4 on a 24576-bit bus with 23.3 TB/s bandwidth. The RX 7600M uses 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth.

Q: How do their power requirements compare?

A: The MI455X has a TDP of 2300 W and a suggested PSU of 2700 W. The RX 7600M has a TDP of 90 W and no suggested PSU listed.

Q: What is the percentile ranking of the RX 7600M?

A: The RX 7600M ranks at the 89th percentile among all GPUs, with an average benchmark score of 63775 in Geekbench OpenCL. The MI455X has no benchmark scores and ranks at the 50th percentile.

Q: Does the MI455X have any display outputs?

A: No. The MI455X has no display outputs, while the RX 7600M has portable device dependent outputs.

The Verdict

The data indicates that these two GPUs serve completely different markets. The AMD Instinct MI455X is built for compute density, with 157.3 TFLOPS FP32, 432 GB of HBM4 memory, and 23.3 TB/s bandwidth. It has no ROPs, no display outputs, and no graphics API support, which confirms it is not intended for rendering or display tasks. Its 2300 W power draw and EAM Module form factor suggest installation in dedicated compute systems rather than consumer hardware.

The AMD Radeon RX 7600M is a mobile graphics processor with 64 ROPs, 28 ray tracing cores, and full graphics API support. Its 90 W power draw and IGP form factor make it suitable for portable devices. The only recorded benchmark score belongs to this part, 63775 in Geekbench OpenCL, placing it at the 89th percentile. Its nearest rivals are all within 1% of its score, indicating that it performs in line with a defined performance class.

For compute workloads that require massive memory capacity and throughput, the MI455X is the clear choice based on specifications. For graphics rendering, gaming, or any workload requiring display output or rasterization, the RX 7600M is the only viable option between the two. The absence of benchmark data for the MI455X means its real-world performance cannot be verified from the database, but its specifications place it in a different performance tier entirely.

Specification Differences

| Specification | AMD Instinct MI455X | AMD Radeon RX 7600M |

|---|---|---|

| Architecture | CDNA 5.0 | RDNA 3.0 |

| Process Node | 2 nm | 6 nm |

| Transistors | 320,000 million | 13,300 million |

| Die Size | 2990 mm² | 204 mm² |

| Transistor Density | 107.0M / mm² | 65.2M / mm² |

| Base Clock | 1000 MHz | 1500 MHz |

| Boost Clock | 2400 MHz | 2410 MHz |

| Game Clock | None | 2070 MHz |

| Memory Size | 432 GB | 8 GB |

| Memory Type | HBM4 | GDDR6 |

| Memory Bus Width | 24576 bit | 128 bit |

| Memory Bandwidth | 23.3 TB/s | 256.0 GB/s |

| Shading Units | 32768 | 1792 |

| TMUs | 1024 | 112 |

| ROPs | 0 | 64 |

| Ray Tracing Cores | None | 28 |

| Pixel Rate | 0 MPixel/s | 154.2 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 269.9 GTexel/s |

| FP32 Performance | 157.3 TFLOPS | 17.27 TFLOPS |

| FP16 Performance | 157.3 TFLOPS (1:1) | 34.55 TFLOPS (2:1) |

| TDP | 2300 W | 90 W |

| Slot Width | EAM Module | IGP |

| Power Connectors | None | None |

| Suggested PSU | 2700 W | None |

| Bus Interface | PCIe 6.0 x16 | PCIe 4.0 x16 |

| Display Outputs | No outputs | Portable Device Dependent |

| DirectX Support | N/A | 12 Ultimate (12_2) |

| OpenGL Support | N/A | 4.6 |

| Vulkan Support | N/A | 1.4 |

| Release Date | 2026-07-22 | 2023-01-03 |

| Production Status | Not listed | Active |