AMD Instinct MI300A vs AMD Radeon Instinct MI300A Comparison

Head-to-Head Benchmarks

The recorded database contains no head-to-head benchmark entries for these two parts, and both have an average benchmark score of 0. The absence of measured results is itself informative: neither accelerator has been exercised through the standard benchmark suite, leaving performance to be inferred from architectural specifications rather than direct comparison.

The Instinct MI300A and Radeon Instinct MI300A share the same silicon foundation, the Aqua Vanjaram chip built on CDNA 3.0 architecture. Both use a 5 nm process at TSMC, integrate 153,000 million transistors on a 1017 mm² die, and achieve a transistor density of 150.4M per mm². The compute differences emerge in the execution resources. The Instinct MI300A carries 14,592 shading units, 912 texture mapping units, and no ROPs. The Radeon Instinct MI300A scales to 19,456 shading units and 1,216 texture mapping units, also with no ROPs. That is a 33.3% increase in shading units and a matching 33.3% increase in TMUs.

The clock behavior tells a more complex story. Both parts list a base clock of 1000 MHz and a boost clock of 2100 MHz. The memory clock, however, diverges sharply. The Instinct MI300A runs memory at 1300 MHz with 5.2 Gbps effective transfer, while the Radeon Instinct MI300A runs memory at 2525 MHz with 10.1 Gbps effective. This nearly doubles the effective memory speed, which flows directly into bandwidth: 5.32 TB/s versus 10.3 TB/s, a 93.6% advantage for the Radeon variant.

Texture rate scales with the TMU count and clocks. The Instinct MI300A achieves 1,915.2 GTexel/s, while the Radeon Instinct MI300A reaches 2,553.6 GTexel/s, a 33.3% lead. FP32 throughput follows the shading unit count: 61.29 TFLOPS versus 81.72 TFLOPS, again a 33.3% gap. The Radeon part also records an FP16 figure of 653.7 TFLOPS (8:1), whereas the Instinct MI300A leaves FP16 unspecified in the database. The pixel rate is 0 MPixel/s for both, consistent with compute-oriented accelerators that lack ROP output stages.

Both cards consume 750 W TDP and recommend a 1150 W power supply. Neither requires auxiliary power connectors, relying on the OAM Module slot design. Both interface through PCIe 5.0 x16 and provide no display outputs, confirming their server-accelerator positioning. The Radeon Instinct MI300A carries 192 GB of HBM3 memory across an 8192-bit bus, while the Instinct MI300A carries 128 GB on the same bus width. The memory capacity difference is 64 GB, a 50% increase for the Radeon variant.

Where Each One Wins

The Instinct MI300A does not win any measured benchmark category, nor does the Radeon Instinct MI300A, because the database holds no benchmark results for either. The wins, therefore, exist only in the specification sheet. The Radeon Instinct MI300A leads in every compute-related field where both are quantified: shading units, TMUs, FP32 throughput, texture rate, memory bandwidth, and memory capacity. The Instinct MI300A leads in no recorded metric except for the absence of an FP16 listing, which is not a performance advantage.

For workloads that scale with raw FP32 compute, the Radeon Instinct MI300A provides 81.72 TFLOPS compared to 61.29 TFLOPS, making it the stronger candidate for dense matrix operations that rely on single-precision arithmetic. The 33.3% advantage in shading units and texture rate suggests proportional gains in shader-bound and texture-bound tasks. Memory-bound workloads see an even larger separation: 10.3 TB/s versus 5.32 TB/s. Applications that stream large datasets, such as training embeddings or processing high-resolution tensors, would feel this bandwidth gap more acutely than the compute gap.

The 192 GB frame buffer on the Radeon variant allows larger model residency than the 128 GB on the base Instinct. For inference or training workloads where the working set approaches or exceeds 128 GB, the Radeon part avoids spills to host memory. The Instinct MI300A retains the same architecture, the same process node, and the same power envelope, so its smaller memory and lower compute make it a reduced configuration of the same design rather than a fundamentally different product.

The FP16 figure on the Radeon part, 653.7 TFLOPS (8:1), indicates a strong ratio relative to its FP32 output. The Instinct MI300A does not provide an FP16 measurement in the database, so no comparative statement can be made beyond noting the omission.

Architecture Differences

Both accelerators use the Aqua Vanjaram chip, CDNA 3.0 architecture, and a 5 nm TSMC process. The die measures 1017 mm² and contains 153,000 million transistors, yielding 150.4M transistors per mm². The core configuration differs: the Instinct MI300A deploys 14,592 shading units and 912 TMUs, while the Radeon Instinct MI300A deploys 19,456 shading units and 1,216 TMUs. Neither has ROPs, and neither lists ray tracing cores or tensor cores. The absence of ROPs explains the 0 MPixel/s pixel rate on both.

Memory architecture diverges in capacity and clock. The Instinct MI300A uses 128 GB of HBM3 on an 8192-bit bus at 1300 MHz, producing 5.32 TB/s. The Radeon Instinct MI300A uses 192 GB of HBM3 on the same 8192-bit bus at 2525 MHz, producing 10.3 TB/s. The bus width is identical, so the bandwidth difference comes entirely from the memory clock. Effective transfer rates are 5.2 Gbps and 10.1 Gbps respectively, a 94.2% increase in per-pin data rate.

Both parts specify a base clock of 1000 MHz and a boost clock of 2100 MHz, suggesting the same power delivery and thermal budget despite the larger compute array on the Radeon variant. Both carry a 750 W TDP, a 1150 W suggested PSU, and an OAM Module slot width with no power connectors. PCIe 5.0 x16 is the host interface for both, and both lack display outputs. The API support fields are marked N/A for the Instinct MI300A and null for the Radeon variant, which reflects the compute-focused nature of both cards rather than a functional difference in graphics capability.

The generation labels differ: the Instinct MI300A is listed under "Instinct (MIx)" while the Radeon Instinct MI300A is listed under "Radeon Instinct (MIx)". The predecessor fields also differ, with the Instinct MI300A succeeding "Radeon Instinct" and the Radeon variant succeeding "FirePro Data Center". Both share the same release date of December 5, 2023, and neither has a successor recorded.

FAQ

Q: Which card has more memory bandwidth?

A: The Radeon Instinct MI300A, at 10.3 TB/s versus 5.32 TB/s for the Instinct MI300A. Both use an 8192-bit HBM3 interface, but the Radeon variant runs memory at 2525 MHz (10.1 Gbps effective) compared to 1300 MHz (5.2 Gbps effective).

Q: Are the compute capabilities different?

A: Yes. The Radeon Instinct MI300A has 19,456 shading units and 1,216 TMUs, delivering 81.72 TFLOPS FP32 and 2,553.6 GTexel/s. The Instinct MI300A has 14,592 shading units and 912 TMUs, delivering 61.29 TFLOPS FP32 and 1,915.2 GTexel/s.

Q: Do the cards use the same chip?

A: Yes, both use the Aqua Vanjaram chip on CDNA 3.0 architecture, fabricated on a 5 nm TSMC process with 153,000 million transistors on a 1017 mm² die.

Q: Is the power requirement the same?

A: Yes, both have a 750 W TDP and a suggested PSU of 1150 W. Neither has auxiliary power connectors, and both use an OAM Module slot width.

Q: What is the memory capacity difference?

A: The Radeon Instinct MI300A has 192 GB of HBM3, while the Instinct MI300A has 128 GB. Both use an 8192-bit bus.

Q: When were both released?

A: Both have a release date of December 5, 2023.

The Verdict

The database shows no measured benchmarks for either accelerator, so any selection must rest on the specification deltas. The Radeon Instinct MI300A is the stronger part on every quantified axis: 33.3% more shading units, 33.3% more TMUs, 33.3% more FP32 throughput, 33.3% more texture rate, 93.6% more memory bandwidth, and 50% more memory capacity. It also carries an FP16 rating of 653.7 TFLOPS (8:1) that the Instinct MI300A does not list.

The Instinct MI300A, with 128 GB and 61.29 TFLOPS, fits workloads where the smaller memory pool and lower compute throughput are sufficient. Both parts share the same power envelope, the same process node, the same die, and the same boost clock, so the Radeon variant achieves its higher specs without an increase in power draw. That makes the Radeon Instinct MI300A the higher-performing configuration of the same fundamental design. The Instinct MI300A is the reduced configuration, and nothing in the recorded data suggests a workload where it outperforms its sibling.

The percentile rank for both is 50 against all GPUs, and both have an average benchmark score of 0, reinforcing that no performance validation exists yet in the database. The choice, then, is between a fully populated Aqua Vanjaram part and a partially populated one. The Radeon Instinct MI300A delivers the full compute array, the larger memory pool, and the faster memory clock. The Instinct MI300A delivers the same architecture with fewer resources.

Specification Differences

| Field | AMD Instinct MI300A | AMD Radeon Instinct MI300A |

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

| Generation | Instinct (MIx) | Radeon Instinct (MIx) |

| Shading Units | 14,592 | 19,456 |

| TMUs | 912 | 1,216 |

| Memory Clock | 1300 MHz, 5.2 Gbps effective | 2525 MHz, 10.1 Gbps effective |

| Memory Size | 128 GB | 192 GB |

| Memory Bandwidth | 5.32 TB/s | 10.3 TB/s |

| Texture Rate | 1,915.2 GTexel/s | 2,553.6 GTexel/s |

| FP32 | 61.29 TFLOPS | 81.72 TFLOPS |

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

| Predecessor | Radeon Instinct | FirePro Data Center |

| DirectX API | N/A | null |

| OpenGL API | N/A | null |

| Vulkan API | N/A | null |

All other fields, including base clock (1000 MHz), boost clock (2100 MHz), process node (5 nm), foundry (TSMC), die size (1017 mm²), transistor count (153,000 million), memory type (HBM3), bus width (8192 bit), ROPs (0), pixel rate (0 MPixel/s), TDP (750 W), slot width (OAM Module), power connectors (None), suggested PSU (1150 W), bus interface (PCIe 5.0 x16), display outputs (No outputs), release date (December 5, 2023), and percentile vs all GPUs (50), are identical.