AMD Instinct MI455X vs AMD Radeon RX 7600S Comparison

Head-to-Head Benchmarks

The recorded data presents an unusual comparison. The AMD Instinct MI455X has no benchmark entries in the database, resulting in an average benchmark score of zero and a percentile rank of 50. The AMD Radeon RX 7600S, by contrast, has ten recorded benchmark scores and an average benchmark score of 16696, placing it in the 60th percentile of all GPUs. This means there are no direct head-to-head measurements between the two accelerators.

The RX 7600S delivers its strongest results in synthetic workloads. Its highest recorded score is 73868 in the Geekbench Vulkan test, with a Geekbench OpenCL score of 68012. In the Passmark suite, the G3D score of 15408 stands out as the primary gaming-oriented metric. The GPU compute score of 6520 indicates solid general compute performance for a mobile part. The DirectX legacy tests show lower figures: DirectX 9 at 211, DirectX 11 at 140, DirectX 10 at 74, and DirectX 12 at 65. The 2D score is 776.

The Instinct MI455X has no comparable entries. Its theoretical specifications, however, point to a vastly different performance class. The FP32 throughput is listed at 157.3 TFLOPS, while the RX 7600S delivers 15.77 TFLOPS. That is an order of magnitude difference in raw floating-point capability. The texture rate tells a similar story: 2,457.6 GTexel/s for the MI455X versus 246.4 GTexel/s for the RX 7600S, a factor of roughly ten.

The pixel rate creates an interesting inversion. The MI455X is listed at 0 MPixel/s with zero ROPs, while the RX 7600S outputs 140.8 GPixel/s from its 64 ROPs. The MI455X is not designed to rasterize frames; it has no display outputs and no graphics API support (DirectX, OpenGL, and Vulkan are all listed as N/A). The RX 7600S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The nearest rivals for the RX 7600S provide context for its average score. The NVIDIA T400 4 GB scores 16792, a delta of -0.6 percent relative to the RX 7600S, meaning the RX 7600S trails that card by a small margin. The NVIDIA T400 scores 16508, placing it 1.1 percent behind the RX 7600S. The NVIDIA GeForce RTX 5090 D V2 scores 16504, also 1.1 percent behind. The NVIDIA Tesla M4 leads at 16932, putting the RX 7600S 1.4 percent behind. All four rivals sit within a narrow 1.4 percent band, indicating the RX 7600S is competitively positioned in its segment.

Where Each One Wins

The RX 7600S wins every category where measurements exist. It has ten benchmark scores, all of which are positive. It supports three graphics APIs. It has display outputs. It has a pixel rate of 140.8 GPixel/s. In any workload that involves rendering frames, presenting images, or running standard graphics applications, the RX 7600S is the only one of the two with functional capability.

The MI455X wins on pure compute specifications. Its FP32 throughput of 157.3 TFLOPS is approximately ten times higher than the RX 7600S. Its FP16 throughput is identical at 157.3 TFLOPS with a 1:1 ratio, whereas the RX 7600S achieves 31.54 TFLOPS at a 2:1 ratio. The MI455X has 32,768 shading units versus 1,792 for the RX 7600S, and 1,024 TMUs versus 112. The memory subsystem is equally lopsided: 432 GB of HBM4 with a 24,576-bit bus and 23.3 TB/s bandwidth, compared to 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth.

The RX 7600S does have one architectural advantage beyond graphics: 28 ray tracing cores, a feature the MI455X does not list at all. Tensor cores are absent from both entries. The RX 7600S also has a game clock of 1865 MHz, whereas the MI455X lists only base and boost clocks.

The use-case split is clear. The RX 7600S is a mobile graphics processor for laptops, evidenced by its IGP slot width, portable-device-dependent display outputs, and 75 W TDP. The MI455X is an accelerator module for servers, evidenced by its EAM Module slot width, no display outputs, no power connectors, and 2300 W TDP. The MI455X targets compute workloads without any graphics output. The RX 7600S targets conventional rendering and gaming workloads.

Architecture Differences

The two chips come from different architectural families within AMD. The MI455X uses CDNA 5.0, while the RX 7600S uses RDNA 3.0. CDNA is AMD's compute-optimized architecture, and RDNA is the gaming-oriented architecture. The codename for the RX 7600S is "Hotpink Bonefish", while the MI455X has no codename listed. The MI455X belongs to the Instinct (MIx) generation, and the RX 7600S belongs to the Navi Mobile (RX 7000M) generation.

The process nodes differ substantially. The MI455X is built on a 2 nm process at TSMC, while the RX 7600S uses a 6 nm process, also at TSMC. The transistor counts reflect the scale difference: the MI455X packs 320,000 million transistors on a 2990 mm² die, yielding a transistor density of 107.0M per mm². The RX 7600S has 13,300 million transistors on a 204 mm² die, with a density of 65.2M per mm². The MI455X die is roughly 14.7 times larger in area and holds about 24 times more transistors.

The memory architectures are entirely different. The MI455X uses HBM4 with 432 GB capacity and a 24,576-bit bus. The RX 7600S uses GDDR6 with 8 GB and a 128-bit bus. The memory clock for the MI455X is 1900 MHz at 7.6 Gbps effective, while the RX 7600S runs at 2000 MHz at 16 Gbps effective. Despite the RX 7600S having a higher per-pin data rate, the MI455X's enormous bus width gives it a bandwidth of 23.3 TB/s, roughly 91 times the RX 7600S's 256.0 GB/s.

The bus interfaces also differ. The MI455X uses PCIe 6.0 x16, while the RX 7600S uses PCIe 4.0 x16. The MI455X has no display outputs, no power connectors, and no suggested PSU. The RX 7600S also has no power connectors listed, but its display outputs are described as "Portable Device Dependent". The MI455X has no production status listed, while the RX 7600S is marked as Active. The MI455X release date is 2026-07-22, and the RX 7600S release date is 2023-01-03. The MI455X predecessor is listed as Radeon Instinct, and the RX 7600S predecessor is Polaris Mobile. Neither has a successor listed.

The Verdict

The data indicates these are not competing products. The MI455X has zero benchmark scores, zero ROPs, a 0 MPixel/s pixel rate, no graphics API support, and no display outputs. It cannot render graphics by any metric in the database. Its 2300 W TDP and 2700 W suggested PSU place it firmly in datacenter infrastructure. The RX 7600S, with its 75 W TDP, IGP form factor, and portable-device-dependent outputs, is a mobile graphics solution with ten recorded benchmark scores and a 60th percentile ranking.

For compute workloads, the MI455X's specifications are overwhelming: ten times the FP32 throughput, ten times the texture rate, 24 times the shading units, and roughly 91 times the memory bandwidth. The 432 GB HBM4 pool is 54 times larger than the RX 7600S's 8 GB GDDR6. These are datacenter-scale figures.

For graphics workloads, the RX 7600S is the only option with any recorded capability. Its 1888 score in 3DMark Steel Nomad DX12, its 68012 Geekbench OpenCL score, and its 73868 Geekbench Vulkan score demonstrate functional graphics and compute performance. Its nearest rivals cluster within a 1.4 percent band, confirming it competes at a specific performance level.

The choice depends entirely on workload class. A system requiring frame rendering, API support, or mobile integration has one valid pick. A system requiring massive parallel compute, high memory capacity, or extreme bandwidth has the other. The MI455X would be nonsensical in a laptop, and the RX 7600S would be inadequate for the MI455X's intended compute scale.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI455X is listed at 157.3 TFLOPS FP32, while the AMD Radeon RX 7600S is listed at 15.77 TFLOPS.

Q: Does the MI455X support DirectX?

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

Q: What memory configuration does each GPU use?

A: The MI455X has 432 GB of HBM4 on a 24,576-bit bus with 23.3 TB/s bandwidth. The RX 7600S has 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth.

Q: How does the RX 7600S compare to its nearest rivals?

A: The RX 7600S trails the NVIDIA T400 4 GB by 0.6 percent and the NVIDIA Tesla M4 by 1.4 percent, while leading the NVIDIA T400 by 1.1 percent and the NVIDIA GeForce RTX 5090 D V2 by 1.2 percent.

Q: What are the power requirements for each?

A: The MI455X has a 2300 W TDP and a suggested PSU of 2700 W. The RX 7600S has a 75 W TDP and no suggested PSU listed.

Q: Which GPU has ray tracing cores?

A: The RX 7600S has 28 ray tracing cores. The MI455X does not list any ray tracing cores.

Specification Differences

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

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

| Architecture | CDNA 5.0 | RDNA 3.0 |

| Codename | None | Hotpink Bonefish |

| Generation | Instinct (MIx) | Navi Mobile (RX 7000M) |

| Chip | MI450 256CU | Navi 33 |

| 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 | 2200 MHz |

| Game Clock | None | 1865 MHz |

| Memory Clock | 1900 MHz, 7.6 Gbps effective | 2000 MHz, 16 Gbps effective |

| 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 | 140.8 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 246.4 GTexel/s |

| FP32 | 157.3 TFLOPS | 15.77 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 31.54 TFLOPS (2:1) |

| TDP | 2300 W | 75 W |

| Slot Width | EAM Module | IGP |

| Suggested PSU | 2700 W | None |

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

| Display Outputs | No outputs | Portable Device Dependent |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Production Status | None | Active |

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

| Predecessor | Radeon Instinct | Polaris Mobile |

| Average Benchmark Score | 0 | 16696 |

| Percentile vs All GPUs | 50 | 60 |