AMD Radeon Instinct MI300A vs NVIDIA GeForce RTX 5090 SE Comparison

FAQ

Q: What are the two products being compared in this analysis?

A: The AMD Radeon Instinct MI300A, a data center compute accelerator from the Radeon Instinct (MIx) generation, and the NVIDIA GeForce RTX 5090 SE, a consumer graphics card from the GeForce 50-series.

Q: How do the memory capacities of the two GPUs differ?

A: The AMD Radeon Instinct MI300A features 192 GB of HBM3 memory on an 8192-bit bus, while the NVIDIA GeForce RTX 5090 SE features 24 GB of GDDR7 memory on a 384-bit bus.

Q: What is the difference in memory bandwidth between the two cards?

A: The AMD Radeon Instinct MI300A delivers a memory bandwidth of 10.3 TB/s, whereas the NVIDIA GeForce RTX 5090 SE delivers 1.34 TB/s. The MI300A’s bandwidth is roughly 7.7 times higher.

Q: Which GPU has a higher boost clock speed?

A: The NVIDIA GeForce RTX 5090 SE has a boost clock of 2377 MHz, while the AMD Radeon Instinct MI300A has a boost clock of 2100 MHz.

Q: What are the power consumption figures for both GPUs?

A: The AMD Radeon Instinct MI300A has a TDP of 750 W, while the NVIDIA GeForce RTX 5090 SE has a TDP of 500 W.

Q: Which GPU includes dedicated ray tracing cores?

A: The NVIDIA GeForce RTX 5090 SE includes 110 ray tracing cores. The AMD Radeon Instinct MI300A does not list any ray tracing cores in its specifications.

Architecture Differences

The AMD Radeon Instinct MI300A and the NVIDIA GeForce RTX 5090 SE represent fundamentally different architectural goals. The MI300A is built on the CDNA 3.0 architecture, designed for data center compute workloads such as high-performance computing and AI training. The RTX 5090 SE is built on the Blackwell 2.0 architecture, targeting real-time graphics rendering and consumer-level AI features.

The chip designs reflect this divergence. The MI300A uses the Aqua Vanjaram chip with a massive die size of 1017 mm², while the RTX 5090 SE uses the GB202 chip with a die size of 750 mm². Both are fabricated on a 5 nm process at TSMC, but the transistor counts differ significantly. The MI300A packs 153,000 million transistors, giving a transistor density of 150.4M per mm². The RTX 5090 SE contains 92,200 million transistors, resulting in a density of 122.9M per mm².

Memory architecture is a key differentiator. The MI300A uses HBM3 memory across an 8192-bit bus, which is typical for accelerators that need to feed massive parallel compute units. The RTX 5090 SE uses GDDR7 memory on a 384-bit bus, a configuration suited for graphics workloads where latency and capacity are balanced differently.

Compute unit configurations also diverge sharply. The MI300A has 19,456 shading units and 1,216 texture mapping units, but its ROP count is listed as zero and its pixel rate is 0 MPixel/s. This indicates it is not designed for rasterization output. The RTX 5090 SE has 14,080 shading units, 440 TMUs, and 160 ROPs, with a pixel rate of 380.3 GPixel/s. The RTX 5090 SE also includes 110 ray tracing cores and 440 tensor cores, while the MI300A lists no RT cores or tensor cores in its specifications.

The API support also separates the two. The MI300A has no listed DirectX, OpenGL, or Vulkan support, while the RTX 5090 SE supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300A has no display outputs, while the RTX 5090 SE provides 1x HDMI 2.1b and 3x DisplayPort 2.1b. The slot widths differ as well: the MI300A is an OAM Module, while the RTX 5090 SE is a dual-slot card.

Head-to-Head Benchmarks

The recorded data shows no benchmark scores for either GPU in the database. Both products have an average benchmark score of zero and a percentile rank of 50 against all GPUs. There are no head-to-head benchmark entries, and neither product has any nearest rivals listed. As such, the performance comparison must be drawn entirely from the specification data provided.

The most significant advantage for the AMD Radeon Instinct MI300A lies in memory bandwidth. The MI300A delivers 10.3 TB/s, which is approximately 7.7 times the 1.34 TB/s of the RTX 5090 SE. This bandwidth advantage is critical for memory-bound compute workloads, where data movement often becomes the bottleneck. The MI300A also has a memory capacity of 192 GB, eight times the 24 GB of the RTX 5090 SE. This allows the MI300A to hold much larger datasets in memory without relying on host transfers.

In raw shading throughput, the MI300A also leads. Its FP32 performance is 81.72 TFLOPS, compared to 66.94 TFLOPS for the RTX 5090 SE. This is an 22% advantage in single-precision compute. The FP16 comparison is starker: the MI300A delivers 653.7 TFLOPS with an 8:1 ratio, while the RTX 5090 SE delivers 66.94 TFLOPS with a 1:1 ratio. The MI300A’s FP16 throughput is nearly ten times higher, though the difference in ratio format should be noted.

The RTX 5090 SE counters with higher clock speeds. Its base clock is 1740 MHz, and its boost clock reaches 2377 MHz. The MI300A has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RTX 5090 SE also has a significantly higher pixel rate at 380.3 GPixel/s, while the MI300A has a pixel rate of 0 MPixel/s. This confirms the MI300A is not intended for pixel output.

Texture rate favors the MI300A. It delivers 2,553.6 GTexel/s, while the RTX 5090 SE delivers 1,045.9 GTexel/s. The MI300A is ahead by a factor of roughly 2.4 in this metric.

Specification Differences

| Specification | AMD Radeon Instinct MI300A | NVIDIA GeForce RTX 5090 SE |

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

| Architecture | CDNA 3.0 | Blackwell 2.0 |

| Chip | Aqua Vanjaram | GB202 |

| Transistors | 153,000 million | 92,200 million |

| Die Size | 1017 mm² | 750 mm² |

| Transistor Density | 150.4M / mm² | 122.9M / mm² |

| Base Clock | 1000 MHz | 1740 MHz |

| Boost Clock | 2100 MHz | 2377 MHz |

| Memory Size | 192 GB | 24 GB |

| Memory Type | HBM3 | GDDR7 |

| Memory Bus Width | 8192 bit | 384 bit |

| Memory Bandwidth | 10.3 TB/s | 1.34 TB/s |

| Memory Clock | 2525 MHz, 10.1 Gbps effective | 1750 MHz, 28 Gbps effective |

| Shading Units | 19456 | 14080 |

| TMUs | 1216 | 440 |

| ROPs | 0 | 160 |

| RT Cores | None | 110 |

| Tensor Cores | None | 440 |

| Pixel Rate | 0 MPixel/s | 380.3 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 1,045.9 GTexel/s |

| FP32 | 81.72 TFLOPS | 66.94 TFLOPS |

| FP16 | 653.7 TFLOPS (8:1) | 66.94 TFLOPS (1:1) |

| TDP | 750 W | 500 W |

| Slot Width | OAM Module | Dual-slot |

| Power Connectors | None | 1x 16-pin |

| Suggested PSU | 1150 W | 900 W |

| Display Outputs | No outputs | 1x HDMI 2.1b, 3x DisplayPort 2.1b |

| DirectX | None | 12 Ultimate (12_2) |

| OpenGL | None | 4.6 |

| Vulkan | None | 1.4 |

| Release Date | 2023-12-05 | 2025-12-31 |

| Predecessor | FirePro Data Center | GeForce 40 |

| Successor | None | GeForce 60 |

| Launch MSRP | None | 1,499 USD |

Where Each One Wins

The AMD Radeon Instinct MI300A is clearly positioned for data center compute workloads. Its 192 GB of HBM3 memory and 10.3 TB/s bandwidth are the defining characteristics. Workloads that require large model residency, such as large language model inference or training, would benefit from this memory capacity. The FP16 throughput of 653.7 TFLOPS, even with the 8:1 ratio, is substantially higher than the RTX 5090 SE, which matters for mixed-precision AI training. The texture rate of 2,553.6 GTexel/s also indicates strong parallel processing capability. The MI300A wins in compute density per die, given its higher transistor count and larger die area.

The NVIDIA GeForce RTX 5090 SE is built for graphics rendering and consumer-facing applications. Its 160 ROPs and pixel rate of 380.3 GPixel/s are essential for rasterization output, which the MI300A cannot perform. The 110 ray tracing cores and DirectX 12 Ultimate support make it suitable for real-time ray-traced rendering in games and professional visualization. The 440 tensor cores provide dedicated hardware for AI inference tasks that fit within the 24 GB GDDR7 memory. The RTX 5090 SE also has higher clock speeds, which benefits latency-sensitive single-threaded workloads.

The power efficiency comparison favors the RTX 5090 SE. It delivers 66.94 TFLOPS of FP32 within a 500 W TDP, while the MI300A delivers 81.72 TFLOPS within a 750 W TDP. The RTX 5090 SE offers a higher performance per watt ratio in FP32, while the MI300A offers higher absolute performance. The suggested PSU of 900 W for the RTX 5090 SE versus 1150 W for the MI300A reflects this difference.

The physical form factor also dictates use cases. The MI300A is an OAM Module with no display outputs and no power connectors, meaning it is designed to be integrated into a server chassis with a baseboard management system. The RTX 5090 SE is a dual-slot card with a 16-pin power connector and display outputs, allowing it to be installed in a standard desktop workstation. Its dimensions of 267 mm in length, 111 mm in height, and 40 mm in width make it a standard consumer card footprint.

The release timing and product lifecycle also differ. The MI300A was released on 2023-12-05, while the RTX 5090 SE is scheduled for release on 2025-12-31. The MI300A’s predecessor is the FirePro Data Center series, while the RTX 5090 SE’s predecessor is the GeForce 40 series. The RTX 5090 SE has a listed successor, the GeForce 60 series, while the MI300A has none listed. The RTX 5090 SE is the only one with an active production status and a launch MSRP of 1,499 USD.