AMD Instinct MI325X vs AMD Radeon RX 6550M Comparison

Where Each One Wins

The AMD Instinct MI325X and the AMD Radeon RX 6550M occupy completely different functional spaces, and the data reflects that split clearly. The MI325X is a compute accelerator with no display outputs, no graphics API support, and a pixel rate listed as 0 MPixel/s. It is not designed to render frames; it is designed to process massive datasets. The RX 6550M, by contrast, is a mobile graphics processor with 32 ROPs, a 90.88 GPixel/s pixel rate, DirectX 12 Ultimate support, and portable device dependent display outputs. It is designed to drive screens and run graphics workloads.

The benchmark data only includes entries for the RX 6550M. It records a Geekbench OpenCL score of 42536 and a Geekbench Vulkan score of 50867, with an average benchmark score of 46702. The MI325X has no recorded benchmark scores in the database, and its percentile versus all GPUs sits at 50, while the RX 6550M sits at 85. That percentile difference indicates that the RX 6550M outperforms the majority of recorded GPUs in the database, whereas the MI325X sits at the median with no measured results to support a higher placement.

In terms of raw compute throughput, the MI325X delivers 81.72 TFLOPS FP32 and 81.72 TFLOPS FP16 (1:1 ratio), while the RX 6550M delivers 5.816 TFLOPS FP32 and 11.63 TFLOPS FP16 (2:1 ratio). The MI325X leads decisively in FP32 and FP16 compute. The RX 6550M wins in graphics-specific features: it has 16 ray accelerators, a 32 ROP count, and a full graphics API stack, all of which the MI325X lacks. The MI325X has 0 ROPs and no DirectX, OpenGL, or Vulkan support.

The memory configuration further separates them. The MI325X uses 256 GB of HBM3e across an 8192-bit bus, delivering 6.14 TB/s bandwidth. The RX 6550M uses 4 GB of GDDR6 across a 64-bit bus, delivering 144.0 GB/s. The MI325X has 1216 TMUs and 19456 shading units; the RX 6550M has 64 TMUs and 1024 shading units. For texture-heavy compute workloads, the MI325X offers a texture rate of 2,553.6 GTexel/s versus 181.8 GTexel/s for the RX 6550M.

The power envelope tells the opposite story. The MI325X has a TDP of 1000 W and a suggested PSU of 1400 W, while the RX 6550M has a TDP of 80 W and no suggested PSU listed. The MI325X is an OAM module with no power connectors, relying on the host system for power delivery. The RX 6550M is an IGP with no power connectors, designed for integration into portable devices.

Architecture Differences

The MI325X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, manufactured on a 5 nm process at TSMC. It contains 153,000 million transistors on a 1017 mm² die, yielding a transistor density of 150.4M per mm². The RX 6550M uses the Navi 24 chip built on RDNA 2.0 architecture, manufactured on a 6 nm process at TSMC. It contains 5,400 million transistors on a 107 mm² die, yielding a transistor density of 50.5M per mm². The MI325X has roughly 28 times the transistor count and a die nearly ten times larger.

The CDNA 3.0 architecture is compute-oriented, which explains the absence of ROPs, ray accelerators, and graphics API support. The RDNA 2.0 architecture in the RX 6550M is graphics-oriented, which explains the presence of 16 RT cores, 32 ROPs, and full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support. The MI325X lists its APIs as N/A across the board.

Clock behavior differs substantially. The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RX 6550M has a base clock of 2000 MHz, a boost clock of 2840 MHz, and a game clock of 2560 MHz. Despite the lower clocks, the MI325X achieves far higher throughput due to its massive shading unit count and memory bandwidth.

Memory architecture is fundamentally different. The MI325X uses HBM3e with a 1500 MHz memory clock and 6 Gbps effective speed, on an 8192-bit bus. The RX 6550M uses GDDR6 with a 2250 MHz memory clock and 18 Gbps effective speed, on a 64-bit bus. The MI325X memory bandwidth of 6.14 TB/s is roughly 43 times the RX 6550M's 144.0 GB/s.

The bus interface differs as well. The MI325X uses PCIe 5.0 x16, while the RX 6550M uses PCIe 4.0 x4. The MI325X has no display outputs, while the RX 6550M has portable device dependent outputs. The release dates are separated by roughly 21 months: the MI325X released on 2024-10-09, and the RX 6550M released on 2023-01-03.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark entries between these two products, and the MI325X has no individual benchmark scores recorded. The only benchmark data available belongs to the RX 6550M, with a Geekbench OpenCL score of 42536 and a Geekbench Vulkan score of 50867.

The RX 6550M's average benchmark score of 46702 places it in the 85th percentile among all GPUs in the database. Its nearest rivals, based on average score, are the Intel Arc A530M at 46614 with a delta of 0.2%, the AMD Radeon RX 5600M at 46601 with a delta of 0.2%, the NVIDIA RTX A2000 at 46043 with a delta of 1.4%, and the NVIDIA RTX 5880 Ada Generation at 45972 with a delta of 1.6%. These deltas indicate that the RX 6550M is essentially tied with the Intel Arc A530M and the RX 5600M, and it leads the RTX A2000 and RTX 5880 Ada Generation by small margins.

Without benchmark scores for the MI325X, the database cannot provide a measured comparison. What the recorded data does show is the compute capability difference: the MI325X's FP32 throughput of 81.72 TFLOPS is approximately 14 times the RX 6550M's 5.816 TFLOPS. The FP16 comparison is less lopsided but still substantial: the MI325X delivers 81.72 TFLOPS FP16, while the RX 6550M delivers 11.63 TFLOPS FP16, a factor of about 7.

The texture rate comparison shows a similar gap. The MI325X delivers 2,553.6 GTexel/s, while the RX 6550M delivers 181.8 GTexel/s. The pixel rate comparison is inverted: the MI325X delivers 0 MPixel/s, while the RX 6550M delivers 90.88 GPixel/s. The RX 6550M is the only one of the two that can produce rendered pixels.

The memory bandwidth gap is the largest recorded difference. The MI325X's 6.14 TB/s versus the RX 6550M's 144.0 GB/s means the MI325X can move data at a rate roughly 43 times higher. This directly supports its role as a large-scale compute accelerator with 256 GB of HBM3e memory.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI325X delivers 81.72 TFLOPS FP32, while the AMD Radeon RX 6550M delivers 5.816 TFLOPS FP32. The MI325X leads by a factor of about 14.

Q: Does the MI325X support graphics APIs?

A: No. The MI325X lists DirectX, OpenGL, and Vulkan as N/A. It also has no display outputs and a pixel rate of 0 MPixel/s. The RX 6550M supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What memory configurations do these GPUs use?

A: The MI325X uses 256 GB of HBM3e on an 8192-bit bus with 6.14 TB/s bandwidth. The RX 6550M uses 4 GB of GDDR6 on a 64-bit bus with 144.0 GB/s bandwidth.

Q: How does the RX 6550M compare to its nearest rivals in the database?

A: The RX 6550M has an average benchmark score of 46702, placing it in the 85th percentile. It is 0.2% ahead of the Intel Arc A530M and the AMD Radeon RX 5600M, 1.4% ahead of the NVIDIA RTX A2000, and 1.6% ahead of the NVIDIA RTX 5880 Ada Generation.

Q: What are the power requirements for each GPU?

A: The MI325X has a TDP of 1000 W and a suggested PSU of 1400 W. The RX 6550M has a TDP of 80 W and no suggested PSU listed. Both use no power connectors.

Q: Which GPU has ray tracing capabilities?

A: The RX 6550M has 16 RT cores. The MI325X does not list any RT cores and has no graphics API support, so it has no ray tracing capability.

The Verdict

The data points to a clear functional split. The AMD Instinct MI325X is built for compute workloads that demand enormous memory capacity and bandwidth. Its 256 GB of HBM3e, 6.14 TB/s bandwidth, and 81.72 TFLOPS FP32 make it suitable for large-scale data processing, AI training, and scientific computing. Its 1000 W TDP and OAM module form factor indicate it belongs in a server or data center environment, not a desktop or laptop.

The AMD Radeon RX 6550M is built for mobile graphics. Its 32 ROPs, 90.88 GPixel/s pixel rate, and DirectX 12 Ultimate support confirm it can render graphics for portable devices. Its 80 W TDP and IGP form factor align with thin and light laptops. Its benchmark scores place it in the 85th percentile, and it edges out its nearest rivals by small margins: 0.2% over the Intel Arc A530M and the RX 5600M, 1.4% over the RTX A2000, and 1.6% over the RTX 5880 Ada Generation.

The MI325X has no recorded benchmark scores and sits at the 50th percentile, which reflects the absence of measured data rather than a performance deficiency. Its raw specifications, however, show overwhelming compute advantages over the RX 6550M in every metric except pixel rate and graphics API support.

For users selecting a GPU for rendering frames on a portable device, the RX 6550M is the only one of the two that can perform that task. For users selecting a GPU for large-scale compute with massive memory allocation, the MI325X provides the necessary resources. The choice depends entirely on whether the workload requires graphics output or raw compute throughput. The database records no scenario where these two compete directly.

Specification Differences

| Specification | AMD Instinct MI325X | AMD Radeon RX 6550M |

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

| Architecture | CDNA 3.0 | RDNA 2.0 |

| Process node | 5 nm | 6 nm |

| Transistors | 153,000 million | 5,400 million |

| Die size | 1017 mm² | 107 mm² |

| Base clock | 1000 MHz | 2000 MHz |

| Boost clock | 2100 MHz | 2840 MHz |

| Memory size | 256 GB | 4 GB |

| Memory type | HBM3e | GDDR6 |

| Memory bus width | 8192 bit | 64 bit |

| Memory bandwidth | 6.14 TB/s | 144.0 GB/s |

| Shading units | 19456 | 1024 |

| TMUs | 1216 | 64 |

| ROPs | 0 | 32 |

| RT cores | None listed | 16 |

| Pixel rate | 0 MPixel/s | 90.88 GPixel/s |

| Texture rate | 2,553.6 GTexel/s | 181.8 GTexel/s |

| FP32 performance | 81.72 TFLOPS | 5.816 TFLOPS |

| FP16 performance | 81.72 TFLOPS (1:1) | 11.63 TFLOPS (2:1) |

| TDP | 1000 W | 80 W |

| Slot width | OAM Module | IGP |

| Bus interface | PCIe 5.0 x16 | PCIe 4.0 x4 |

| 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 | 2024-10-09 | 2023-01-03 |