AMD Instinct MI300A vs AMD Radeon RX 6550S Comparison

AMD Instinct MI300A and AMD Radeon RX 6550S represent two completely different corners of AMD’s GPU lineup. The MI300A is a data-center accelerator built on CDNA 3.0, while the RX 6550S is a mobile graphics processor for thin-and-light laptops. They share a manufacturer and little else. The recorded data shows no overlapping benchmark scores, so the comparison relies entirely on architectural and specification differences.

Head-to-Head Benchmarks

The database contains no direct benchmark measurements for either GPU. The MI300A has an average benchmark score of zero, and the RX 6550S also has an average benchmark score of zero. Both parts sit at the 50th percentile among all GPUs in the database, which reflects the absence of recorded performance data rather than any meaningful performance parity. With no head-to-head benchmark results, the wins column is empty for both sides: zero wins for the MI300A and zero wins for the RX 6550S.

What the data does show is the scale of the performance envelope each GPU is designed for. The MI300A delivers 61.29 TFLOPS of FP32 compute, while the RX 6550S delivers 4.915 TFLOPS. That is a 12.5-fold difference in raw single-precision throughput, though the exact ratio varies depending on workload characteristics. The MI300A’s texture rate stands at 1,915.2 GTexel/s, compared to 153.6 GTexel/s for the RX 6550S. Pixel rate tells a similar story, though the MI300A records 0 MPixel/s because its architecture lacks traditional ROPs, while the RX 6550S reaches 76.80 GPixel/s.

Memory bandwidth amplifies the gap. The MI300A moves 5.32 TB/s through an 8192-bit bus, while the RX 6550S manages 128.0 GB/s over a 64-bit interface. The MI300A’s memory bandwidth is roughly 41.5 times higher. These are not competitive numbers; they describe different product categories entirely. The MI300A targets massive parallel workloads, and the RX 6550S targets power-constrained mobile environments.

Where Each One Wins

The MI300A wins in every compute-heavy category where the data exists. Its FP32 throughput of 61.29 TFLOPS dwarfs the 4.915 TFLOPS of the RX 6550S. Texture fill rate favors the MI300A at 1,915.2 GTexel/s versus 153.6 GTexel/s. Memory capacity and bandwidth also go decisively to the MI300A: 128 GB of HBM3 versus 4 GB of GDDR6, and 5.32 TB/s versus 128.0 GB/s. The MI300A uses a 5 nm process from TSMC, packs 153,000 million transistors on a 1017 mm² die, and connects via PCIe 5.0 x16. It has 14,592 shading units and 912 texture mapping units. These are the specifications of a compute accelerator built for large-scale AI, scientific simulation, and high-performance computing.

The RX 6550S wins where efficiency and portability matter. Its TDP is 50 W, compared to the MI300A’s 750 W. The RX 6550S is an IGP form factor, meaning it is integrated into a mobile platform, while the MI300A is an OAM Module. The RX 6550S has display outputs described as Portable Device Dependent, while the MI300A has no outputs at all. For graphics rendering, the RX 6550S includes 32 ROPs and 16 ray accelerators, enabling rasterization and ray tracing that the MI300A cannot perform. The RX 6550S supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI300A lists N/A for all three APIs. The RX 6550S also has a higher base clock at 2000 MHz and a higher boost clock at 2400 MHz, compared to the MI300A’s 1000 MHz base and 2100 MHz boost. Clock speed favors the smaller chip, but that advantage does not translate into absolute performance.

The RX 6550S also wins on process efficiency per transistor. Its 6 nm TSMC node yields a die size of 107 mm² with 5,400 million transistors, giving a density of 50.5M / mm². The MI300A’s 5 nm node achieves 150.4M / mm², so the larger chip is actually denser. However, the RX 6550S consumes 14 times less power, making it the only viable choice for battery-powered devices.

Architecture Differences

The MI300A uses CDNA 3.0 architecture on the Aqua Vanjaram chip. This is a compute-optimized design with no traditional graphics pipeline. It has zero ROPs, zero ray tracing cores, and no display outputs. The architecture prioritizes FP32 throughput, memory bandwidth, and transistor density. The chip is built on TSMC’s 5 nm process, with 153,000 million transistors spread across a 1017 mm² die. The transistor density of 150.4M / mm² reflects the massive compute clusters and HBM3 memory stacks integrated into the package.

The RX 6550S uses RDNA 2.0 architecture on the Navi 24 chip. This is a graphics-first design with 32 ROPs, 16 ray accelerators, and full API support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. It is built on TSMC’s 6 nm process, with 5,400 million transistors on a 107 mm² die. The transistor density of 50.5M / mm² is lower than the MI300A, reflecting the different design goals. RDNA 2.0 includes dedicated ray tracing hardware, which CDNA 3.0 does not have. The RX 6550S also supports FP16 compute at 9.830 TFLOPS with a 2:1 ratio, while the MI300A lists no FP16 figure in the recorded data.

Memory architecture differs fundamentally. The MI300A uses HBM3 with a 8192-bit bus and 5.32 TB/s bandwidth. This is a stacked memory design optimized for bandwidth-hungry workloads. The RX 6550S uses GDDR6 with a 64-bit bus and 128.0 GB/s bandwidth. The bus width difference is 128-fold, which explains the bandwidth gap. The MI300A’s memory size of 128 GB is 32 times larger than the RX 6550S’s 4 GB.

Specification Differences

The following table highlights the fields where the two GPUs differ, based solely on the recorded data.

| Specification | AMD Instinct MI300A | AMD Radeon RX 6550S |

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

| Architecture | CDNA 3.0 | RDNA 2.0 |

| Chip | Aqua Vanjaram | Navi 24 |

| 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 | 2400 MHz |

| Game Clock | Not specified | 2170 MHz |

| Memory Clock | 1300 MHz, 5.2 Gbps effective | 2000 MHz, 16 Gbps effective |

| Memory Size | 128 GB | 4 GB |

| Memory Type | HBM3 | GDDR6 |

| Memory Bus Width | 8192 bit | 64 bit |

| Memory Bandwidth | 5.32 TB/s | 128.0 GB/s |

| Shading Units | 14,592 | 1,024 |

| TMUs | 912 | 64 |

| ROPs | 0 | 32 |

| Ray Tracing Cores | Not specified | 16 |

| Pixel Rate | 0 MPixel/s | 76.80 GPixel/s |

| Texture Rate | 1,915.2 GTexel/s | 153.6 GTexel/s |

| FP32 Performance | 61.29 TFLOPS | 4.915 TFLOPS |

| FP16 Performance | Not specified | 9.830 TFLOPS (2:1) |

| TDP | 750 W | 50 W |

| Slot Width | OAM Module | IGP |

| Power Connectors | None | None |

| Suggested PSU | 1150 W | Not specified |

| 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 | 2023-12-05 | 2023-01-03 |

| Predecessor | Radeon Instinct | Polaris Mobile |

The MI300A has no ROPs, no ray tracing cores, and no display outputs, confirming its compute-only role. The RX 6550S has a full graphics pipeline, including 32 ROPs and 16 ray accelerators. The MI300A’s FP32 throughput is roughly 12.5 times higher, but it cannot render a single frame to a display. The RX 6550S can output to portable device displays and supports modern graphics APIs.

Power draw separates the two by 700 W. The MI300A requires a 1150 W suggested PSU, while the RX 6550S has no suggested PSU listed, consistent with its IGP form factor. The MI300A uses PCIe 5.0 x16, while the RX 6550S uses PCIe 4.0 x4, reflecting the bandwidth requirements of each platform.

FAQ

Q: Which GPU has higher FP32 performance?

A: The AMD Instinct MI300A delivers 61.29 TFLOPS, compared to 4.915 TFLOPS for the AMD Radeon RX 6550S.

Q: What is the memory bandwidth difference?

A: The MI300A provides 5.32 TB/s over an 8192-bit HBM3 bus, while the RX 6550S provides 128.0 GB/s over a 64-bit GDDR6 bus.

Q: Which GPU supports ray tracing?

A: Only the AMD Radeon RX 6550S has ray tracing cores, with 16 dedicated accelerators. The MI300A lists no ray tracing cores.

Q: Can the MI300A output to a display?

A: No. The MI300A has no display outputs, while the RX 6550S has outputs described as Portable Device Dependent.

Q: What is the TDP of each GPU?

A: The MI300A has a TDP of 750 W, and the RX 6550S has a TDP of 50 W.

Q: Which GPU has more shading units?

A: The MI300A has 14,592 shading units, while the RX 6550S has 1,024 shading units.