AMD Instinct MI308X vs NVIDIA RTX PRO 4500 Blackwell Server Comparison

Head-to-Head Benchmarks

The recorded data shows no direct benchmark scores for either the AMD Instinct MI308X or the NVIDIA RTX PRO 4500 Blackwell Server. The database lists zero benchmark entries for both accelerators, and the head-to-head benchmark table is empty. Consequently, the win count for each product is zero. This means any performance comparison must be derived from the architectural specifications and raw compute metrics rather than measured application results.

The raw compute figures, however, tell a clear story. The AMD Instinct MI308X delivers 81.72 TFLOPS of FP32 throughput, which is 61% higher than the 50.70 TFLOPS produced by the NVIDIA RTX PRO 4500 Blackwell Server. In FP16 workloads, the same ratio holds, with the MI308X again at 81.72 TFLOPS versus 50.70 TFLOPS for the NVIDIA part. Both cards process FP16 at a 1:1 ratio with FP32, so the performance gap remains consistent across precision formats.

The memory subsystem amplifies this difference. The MI308X has a memory bandwidth of 5.32 TB/s, roughly 6.6 times the 800.3 GB/s available on the RTX PRO 4500. Texture throughput follows a similar pattern: the AMD part reaches 2,553.6 GTexel/s, while the NVIDIA card manages 792.1 GTexel/s. The MI308X is roughly 3.2 times faster in texture fill rate.

The NVIDIA card holds advantages in certain rasterization metrics. Its pixel rate is 270.5 GPixel/s, while the MI308X reports 0 MPixel/s. The AMD accelerator has no ROPs listed, so it cannot produce pixel output in the traditional sense. The RTX PRO 4500 also operates at higher clock speeds, with a boost of 2415 MHz compared to 2100 MHz for the MI308X. Base clocks are 1215 MHz for NVIDIA versus 1000 MHz for AMD.

Architecture Differences

The two accelerators come from different architectural lineages. The AMD Instinct MI308X uses CDNA 3.0 architecture on the Aqua Vanjaram chip, built for compute-focused Instinct (MIx) generation products. The NVIDIA RTX PRO 4500 Blackwell Server uses the Blackwell 2.0 architecture on the GB203 die, part of the Server Blackwell (Bxx) generation.

Both chips are fabricated on a 5 nm process at TSMC, but the similarities end there. The MI308X die measures 1017 mm² and contains 153,000 million transistors, giving it a transistor density of 150.4 million per mm². The GB203 die is much smaller at 378 mm², with 45,600 million transistors and a density of 120.6 million per mm². The AMD chip packs roughly 3.4 times the transistor count into about 2.7 times the die area.

Shading unit counts differ substantially. The MI308X has 19,456 shading units and 1,216 texture mapping units, but lists no ROPs, RT cores, or tensor cores. The RTX PRO 4500 has 10,496 shading units, 328 TMUs, 112 ROPs, 82 RT cores, and 328 tensor cores. This structural difference reflects their intended roles: the MI308X is a pure compute accelerator with no display or rasterization path, while the NVIDIA part includes dedicated ray tracing and tensor hardware.

Memory technology diverges completely. The MI308X uses 192 GB of HBM3 on an 8192-bit memory bus, achieving 5.32 TB/s bandwidth. The RTX PRO 4500 uses 32 GB of GDDR7 on a 256-bit bus, reaching 800.3 GB/s. The AMD card has six times the memory capacity and roughly 6.6 times the bandwidth. Memory clock rates also differ: 1300 MHz with 5.2 Gbps effective for the MI308X versus 1563 MHz with 25 Gbps effective for the NVIDIA part, reflecting the different memory types.

API support separates the two as well. The MI308X reports N/A for DirectX, OpenGL, and Vulkan, confirming its compute-only orientation. The RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The NVIDIA card also has display outputs listed as none, so it is not a desktop graphics card, but it retains a full graphics API stack.

Power and physical design differ markedly. The MI308X has a 750 W TDP and ships as an OAM Module with no power connectors listed, requiring a suggested 1150 W power supply. The RTX PRO 4500 has a 165 W TDP, uses a single 16-pin connector, fits a single-slot form factor, and suggests a 450 W power supply. The NVIDIA card measures 267 mm in length, 111 mm in height, and 40 mm in width. The AMD module has no dimensions listed.

Release timing also separates the products. The MI308X was released on 2023-12-05, while the RTX PRO 4500 has a release date of 2026-03-16. The NVIDIA part is marked as Active production status, with a predecessor in Server Hopper and a successor in Server Rubin. The AMD part lists Radeon Instinct as its predecessor and has no successor recorded.

Where Each One Wins

The AMD Instinct MI308X wins decisively in raw compute throughput and memory capacity. Its 81.72 TFLOPS FP32 and FP16 performance puts it well ahead of the RTX PRO 4500's 50.70 TFLOPS. The 192 GB HBM3 memory pool is six times larger than the 32 GB GDDR7 on the NVIDIA card, and the 5.32 TB/s bandwidth is roughly 6.6 times higher. Workloads that scale with memory size and bandwidth, such as large model inference, training datasets, or scientific simulations that exceed 32 GB, favor the MI308X strongly. The 2,553.6 GTexel/s texture rate also gives AMD the edge in texture-heavy compute tasks.

The NVIDIA RTX PRO 4500 Blackwell Server wins in rasterization and graphics-adjacent workloads. Its 270.5 GPixel/s pixel rate is a real capability, while the MI308X reports 0 MPixel/s. The 112 ROPs, 82 RT cores, and 328 tensor cores provide hardware paths for ray tracing and tensor operations that the AMD part lacks entirely. The full API support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 means the NVIDIA card can run graphics workloads where the MI308X cannot. Power efficiency also favors NVIDIA: 165 W versus 750 W TDP delivers the same FP32-per-watt ratio at roughly 0.31 TFLOPS per watt for NVIDIA versus 0.11 for AMD, though this is derived from the listed figures.

Physical deployment constraints also create a split. The single-slot 267 mm NVIDIA card with a 450 W suggested PSU fits standard server chassis and power budgets. The OAM Module MI308X needs a 1150 W power supply and specialized mounting, which limits its use to larger compute nodes.

FAQ

Q: Which card has higher FP32 performance?

A: The AMD Instinct MI308X delivers 81.72 TFLOPS FP32, which is 61% higher than the 50.70 TFLOPS from the NVIDIA RTX PRO 4500 Blackwell Server.

Q: How much memory does each card have?

A: The MI308X has 192 GB of HBM3 on an 8192-bit bus. The RTX PRO 4500 has 32 GB of GDDR7 on a 256-bit bus.

Q: Does either card support graphics APIs?

A: The RTX PRO 4500 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI308X reports N/A for all three APIs, indicating no graphics pipeline support.

Q: What is the power requirement difference?

A: The MI308X has a 750 W TDP and a suggested 1150 W power supply. The RTX PRO 4500 has a 165 W TDP and a suggested 450 W power supply.

Q: Which card has ray tracing hardware?

A: The RTX PRO 4500 has 82 RT cores and 328 tensor cores. The MI308X lists no RT cores or tensor cores.

Q: When was each card released?

A: The MI308X has a release date of 2023-12-05. The RTX PRO 4500 has a release date of 2026-03-16.

Specification Differences

| Specification | AMD Instinct MI308X | NVIDIA RTX PRO 4500 Blackwell Server |

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

| Architecture | CDNA 3.0 | Blackwell 2.0 |

| Chip | Aqua Vanjaram | GB203 |

| Process Node | 5 nm | 5 nm |

| Transistors | 153,000 million | 45,600 million |

| Die Size | 1017 mm² | 378 mm² |

| Transistor Density | 150.4M / mm² | 120.6M / mm² |

| Base Clock | 1000 MHz | 1215 MHz |

| Boost Clock | 2100 MHz | 2415 MHz |

| Memory Size | 192 GB | 32 GB |

| Memory Type | HBM3 | GDDR7 |

| Memory Bus | 8192 bit | 256 bit |

| Memory Bandwidth | 5.32 TB/s | 800.3 GB/s |

| Shading Units | 19456 | 10496 |

| TMUs | 1216 | 328 |

| ROPs | 0 | 112 |

| RT Cores | Not listed | 82 |

| Tensor Cores | Not listed | 328 |

| Pixel Rate | 0 MPixel/s | 270.5 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 792.1 GTexel/s |

| FP32 | 81.72 TFLOPS | 50.70 TFLOPS |

| FP16 | 81.72 TFLOPS (1:1) | 50.70 TFLOPS (1:1) |

| TDP | 750 W | 165 W |

| Slot Width | OAM Module | Single-slot |

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

| Suggested PSU | 1150 W | 450 W |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Dimensions | Not listed | 267 mm x 111 mm x 40 mm |

| Release Date | 2023-12-05 | 2026-03-16 |

| Production Status | Not listed | Active |

The Verdict

The data points to two different deployment profiles. The AMD Instinct MI308X is the choice for memory-bound and compute-bound workloads that can use 192 GB of HBM3 at 5.32 TB/s. Its 81.72 TFLOPS FP32 and FP16 throughput is the highest raw compute figure in this comparison, and the absence of graphics APIs or ROPs confirms it is purpose-built for dense numerical work. The 750 W TDP and OAM Module form factor require a serious power delivery system and chassis designed for accelerators.

The NVIDIA RTX PRO 4500 Blackwell Server fits a different niche. Its 32 GB GDDR7 memory and 800.3 GB/s bandwidth are modest next to the MI308X, but the card brings a complete feature set: 112 ROPs, 82 RT cores, 328 tensor cores, DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The 270.5 GPixel/s pixel rate gives it actual rasterization capability, which the MI308X lacks entirely. The 165 W TDP, single-slot design, and 450 W suggested PSU make it deployable in standard servers without custom power infrastructure.

The decision hinges on workload type. If the task involves large models, high-bandwidth data movement, or pure FP32/FP16 compute that fits within the AMD ecosystem, the MI308X offers roughly 61% more compute throughput and six times the memory. If the workload requires graphics APIs, ray tracing, tensor operations, or fits within a 32 GB memory footprint, the RTX PRO 4500 provides those capabilities at a fraction of the power draw. The release dates also matter for platform planning: the MI308X launched in 2023, while the RTX PRO 4500 arrives in 2026, making the NVIDIA part the newer design with active production status.