AMD Instinct MI300A vs AMD Radeon RX 6550M Comparison

AMD Instinct MI300A and AMD Radeon RX 6550M occupy opposite ends of the AMD accelerator spectrum. The MI300A is a massive datacenter-oriented compute module built on CDNA 3.0, while the RX 6550M is a mobile consumer graphics processor based on RDNA 2.0. The recorded data shows stark contrasts in nearly every measurable specification, from process node and memory configuration to raw computational throughput. This analysis examines the differences strictly from the database measurements.

FAQ

Q: What are the primary architectural families of these two GPUs?

A: The AMD Instinct MI300A uses the CDNA 3.0 architecture, while the AMD Radeon RX 6550M uses RDNA 2.0. The MI300A is part of the Instinct (MIx) generation, and the RX 6550M belongs to the Navi Mobile (RX 6000M) generation.

Q: How do their memory subsystems compare?

A: The MI300A has 128 GB of HBM3 memory on an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RX 6550M has 4 GB of GDDR6 memory on a 64-bit bus, delivering 144.0 GB/s. The MI300A memory bus width is 128 times larger.

Q: Which processor has the higher boost clock?

A: The RX 6550M boosts to 2840 MHz, compared to the MI300A's 2100 MHz. The RX 6550M also has a base clock of 2000 MHz, while the MI300A runs at 1000 MHz base.

Q: What is the transistor count difference?

A: The MI300A packs 153,000 million transistors on a 1017 mm² die, while the RX 6550M has 5,400 million transistors on a 107 mm² die. The MI300A's transistor density is 150.4M per mm² versus 50.5M per mm² for the RX 6550M.

Q: Which one has ray tracing cores?

A: Only the RX 6550M has 16 ray tracing cores. The MI300A does not list any RT cores in its specifications.

Q: What is the average benchmark score for each?

A: The RX 6550M has an average benchmark score of 46702, sitting in the 85th percentile of all GPUs. The MI300A shows no recorded benchmarks, with an average score of 0 and a 50th percentile placement.

Architecture Differences

The process node marks the first major divergence. The MI300A is fabricated on a 5 nm process at TSMC, while the RX 6550M uses a 6 nm process, also at TSMC. This node difference contributes to the MI300A's far higher transistor density: 150.4M per mm² versus 50.5M per mm².

The chip designs could not be more different. The MI300A uses the Aqua Vanjaram chip with CDNA 3.0 architecture, designed for compute workloads with no display outputs and no graphics API support. The RX 6550M uses the Navi 24 chip with RDNA 2.0, supporting DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300A lists no APIs at all (N/A for DirectX, OpenGL, and Vulkan), confirming its role as a pure compute accelerator.

Shading unit counts reveal the scale gap. The MI300A has 14,592 shading units, 912 texture mapping units, and zero ROPs. Its pixel rate is listed as 0 MPixel/s, indicating it does not perform traditional rasterization. The RX 6550M has 1,024 shading units, 64 TMUs, and 32 ROPs, with a pixel rate of 90.88 GPixel/s. The MI300A's texture rate is 1,915.2 GTexel/s, compared to 181.8 GTexel/s for the RX 6550M.

Memory architecture also differs fundamentally. The MI300A uses HBM3 with 128 GB capacity and 8192-bit bus width. The RX 6550M uses GDDR6 with 4 GB and a 64-bit bus. The bandwidth gap is substantial: 5.32 TB/s versus 144.0 GB/s. The MI300A memory clock is 1300 MHz with 5.2 Gbps effective data rate, while the RX 6550M memory runs at 2250 MHz with 18 Gbps effective.

The MI300A is an OAM Module with a 750 W TDP and no power connectors, requiring a suggested PSU of 1150 W. The RX 6550M is an IGP with an 80 W TDP, also no power connectors, and no suggested PSU listed. The MI300A uses PCIe 5.0 x16, while the RX 6550M uses PCIe 4.0 x4. The MI300A has no display outputs; the RX 6550M outputs are portable device dependent.

Release dates differ by nearly a year. The RX 6550M launched on 2023-01-03, while the MI300A arrived on 2023-12-05. The RX 6550M is marked as Active in production status, with the MI300A not having a listed production status. The MI300A predecessor is Radeon Instinct, and the RX 6550M predecessor is Polaris Mobile.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark comparisons between these two processors. The wins counter shows zero for both sides. Instead, the only benchmark data available belongs to the RX 6550M, which recorded two Geekbench results: 42,536 in OpenCL and 50,867 in Vulkan. These produce an average score of 46,702.

The RX 6550M's percentile placement is 85 out of all GPUs. Its nearest rivals in the database include the Intel Arc A530M with an average score of 46,614 and a delta of 0.2%, the AMD Radeon RX 5600M at 46,601 with a 0.2% delta, the NVIDIA RTX A2000 at 46,043 with a 1.4% delta, and the NVIDIA RTX 5880 Ada Generation at 45,972 with a 1.6% delta. These deltas indicate the RX 6550M leads its closest competitor by a marginal 0.2%, but the performance spread across all four rivals is under 2%.

The MI300A has no recorded benchmarks, no nearest rivals, and an average score of zero. Its percentile rank of 50 is a default placement rather than a measured result. The absence of benchmark data means no quantitative comparison between the two chips is possible from the database.

Compute throughput figures provide the clearest numerical contrast. The MI300A delivers 61.29 TFLOPS of FP32 performance, while the RX 6550M delivers 5.816 TFLOPS. This is a 10.5 times advantage for the MI300A in single-precision floating-point. The RX 6550M also lists FP16 performance at 11.63 TFLOPS (2:1 ratio), while the MI300A does not list FP16 figures.

Texture rates reinforce the gap: the MI300A processes 1,915.2 GTexel/s versus 181.8 GTexel/s for the RX 6550M. The MI300A's texture rate exceeds the RX 6550M by more than a factor of ten. Pixel rates, however, show the opposite pattern, with the RX 6550M producing 90.88 GPixel/s and the MI300A producing zero.

The RX 6550M's Vulkan score of 50,867 is notably higher than its OpenCL score of 42,536. The difference of 8,331 points suggests stronger performance in the Vulkan API, which aligns with its RDNA 2.0 consumer-focused feature set. The MI300A supports no consumer graphics APIs, so such comparisons cannot be extended.

The Verdict

The data indicates two entirely different product categories. The MI300A is a datacenter compute module with 128 GB of HBM3, 61.29 TFLOPS FP32, and a 750 W TDP. It targets workloads that require massive memory bandwidth and high floating-point throughput, with no display functionality. The RX 6550M is a mobile consumer GPU with 4 GB of GDDR6, 5.816 TFLOPS FP32, and an 80 W TDP. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, and is designed for portable devices.

For compute-heavy applications that can use the MI300A's scale, the 61.29 TFLOPS and 5.32 TB/s bandwidth represent a different class of performance. The 14592 shading units and 912 TMUs handle parallel workloads that the RX 6550M's 1024 shading units and 64 TMUs cannot approach. The MI300A's lack of ROPs and pixel rate confirms it is not built for graphics output.

For mobile graphics, the RX 6550M has the only recorded benchmark data. Its 85th percentile ranking and average score of 46,702 place it among capable mobile parts. The nearest rival deltas, all under 1.6%, indicate a tight competitive field. The RX 6550M's 16 RT cores provide hardware ray tracing support, a feature entirely absent from the MI300A.

The process node and physical dimensions further separate the two. The MI300A uses a 5 nm process and occupies 1017 mm², while the RX 6550M uses a 6 nm process and occupies 107 mm². The MI300A's die is nearly ten times larger, and its transistor count is over 28 times higher. These physical differences translate directly into the performance and power gaps seen in the specifications.

The MI300A's 2100 MHz boost clock is lower than the RX 6550M's 2840 MHz, but the architectural advantages in width and memory bandwidth compensate. The RX 6550M's higher clocks suit its mobile power envelope, while the MI300A relies on massive parallelism rather than clock speed.

The RX 6550M's production status is Active, indicating current availability. The MI300A's production status is not listed. The RX 6550M has a release date of 2023-01-03, and the MI300A followed on 2023-12-05. Both are AMD products, but their lineages diverge: the RX 6550M follows Polaris Mobile, and the MI300A follows Radeon Instinct.

Bus interfaces reflect their intended slots. The MI300A uses PCIe 5.0 x16, and the RX 6550M uses PCIe 4.0 x4. The MI300A's interface supports higher bandwidth for datacenter integration, while the RX 6550M's narrower interface suits mobile motherboard constraints. The MI300A also lists a suggested PSU of 1150 W, which is absent for the RX 6550M.

Users seeking a mobile GPU with ray tracing, graphics API support, and a measured benchmark score of 46,702 would select the RX 6550M. Users needing a compute accelerator with 128 GB HBM3, 5.32 TB/s bandwidth, and 61.29 TFLOPS FP32 would select the MI300A. The two do not compete in the same market segment, and the database contains no direct comparison benchmarks to suggest otherwise.

Specification Differences

| Specification | AMD Instinct MI300A | 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 |

| Transistor density | 150.4M / mm² | 50.5M / mm² |

| Base clock | 1000 MHz | 2000 MHz |

| Boost clock | 2100 MHz | 2840 MHz |

| Game clock | N/A | 2560 MHz |

| Memory size | 128 GB | 4 GB |

| Memory type | HBM3 | GDDR6 |

| Memory bus width | 8192 bit | 64 bit |

| Memory bandwidth | 5.32 TB/s | 144.0 GB/s |

| Memory clock | 1300 MHz 5.2 Gbps effective | 2250 MHz 18 Gbps effective |

| Shading units | 14592 | 1024 |

| TMUs | 912 | 64 |

| ROPs | 0 | 32 |

| RT cores | N/A | 16 |

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

| Texture rate | 1,915.2 GTexel/s | 181.8 GTexel/s |

| FP32 | 61.29 TFLOPS | 5.816 TFLOPS |

| FP16 | N/A | 11.63 TFLOPS (2:1) |

| TDP | 750 W | 80 W |

| Slot width | OAM Module | IGP |

| Suggested PSU | 1150 W | N/A |

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

| Display outputs | No outputs | Portable Device Dependent |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Release date | 2023-12-05 | 2023-01-03 |

| Production status | N/A | Active |

| Predecessor | Radeon Instinct | Polaris Mobile |

| Percentile vs all GPUs | 50 | 85 |

| Average benchmark score | 0 | 46702 |