AMD Instinct MI300X vs NVIDIA RTX PRO 4500 Blackwell Server Comparison

Where Each One Wins

The AMD Instinct MI300X and NVIDIA RTX PRO 4500 Blackwell Server occupy entirely different positions in the database. The MI300X is a high-capacity accelerator aimed at massive memory-bound workloads, while the RTX PRO 4500 is a compact, power-efficient server card for more conventional compute tasks. The data shows a clear split: the MI300X wins on raw compute scale and memory capacity, whereas the RTX PRO 4500 wins on efficiency, feature set, and physical integration.

The MI300X delivers 81.72 TFLOPS FP32 and 81.72 TFLOPS FP16 (1:1), compared to 50.70 TFLOPS FP32 and 50.70 TFLOPS FP16 (1:1) for the RTX PRO 4500. That is a 61% advantage in raw FP32 throughput for the AMD part. But the RTX PRO 4500 does this within a 165 W TDP versus 750 W for the MI300X, meaning the NVIDIA card produces more than four times the compute per watt. For power-constrained rack deployments, that efficiency difference matters as much as the absolute performance.

Memory is where the separation becomes stark. The MI300X carries 192 GB of HBM3 on an 8192-bit bus, yielding 5.32 TB/s of bandwidth. The RTX PRO 4500 has 32 GB of GDDR7 on a 256-bit bus, delivering 800.3 GB/s. That is a 6x capacity advantage and a 6.6x bandwidth advantage for the AMD card. Workloads that need large model weights or large datasets in fast memory will favor the MI300X decisively. The RTX PRO 4500, by contrast, is limited to models or batches that fit within 32 GB, but its GDDR7 memory operates at 25 Gbps effective, which is a high per-pin rate.

The RTX PRO 4500 also brings features the MI300X lacks entirely. It has 82 RT cores and 328 tensor cores, while the MI300X has no RT cores and no dedicated tensor core count listed. The NVIDIA card supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300X lists N/A for all three APIs. For any workload involving ray tracing, graphics, or general-purpose GPU compute via standard graphics APIs, the RTX PRO 4500 is the only option here. The MI300X is a pure compute accelerator with no display outputs, and the RTX PRO 4500 also has no display outputs, so neither card is for desktop graphics.

Physical design differs too. The MI300X is an OAM module with no power connectors, requiring a 1150 W suggested PSU. The RTX PRO 4500 is a single-slot PCIe card, 267 mm long, 111 mm tall, 40 mm wide, using one 16-pin connector and a 450 W suggested PSU. Server chassis that can accommodate OAM modules will take the MI300X; standard PCIe slots will take the RTX PRO 4500.

The Verdict

The database indicates that the MI300X is the choice for workloads where memory capacity and raw FP32 throughput are the limiting factors. Its 192 GB HBM3 pool and 5.32 TB/s bandwidth are unmatched in this comparison. The benchmark score reflects this: the MI300X records a Geekbench OpenCL score of 317994, placing it at the 100th percentile of all GPUs. Its nearest rivals in the database are the NVIDIA H200 NVL at 334891 (5% higher), the NVIDIA B200 at 345482 (8% higher), the NVIDIA L40S at 295763 (7.5% lower), and the RTX 6000 Ada Generation at 287237 (10.7% lower). The MI300X sits comfortably above the L40S and RTX 6000 Ada, and only slightly below the H200 and B200.

The RTX PRO 4500 has no recorded benchmark scores in the database and sits at the 50th percentile. That makes direct performance comparison impossible from the recorded data, but its specifications indicate a different role. It is for servers that need a PCIe card with standard API support, hardware ray tracing, and tensor cores, all within a 165 W power envelope. The MI300X cannot provide those features. The RTX PRO 4500 is also the only one of the two with an active production status, while the MI300X's production status is not listed.

For builders assembling a system for large-scale AI inference or training with very large models, the MI300X is the data-backed pick. For a general-purpose server GPU that handles compute, graphics APIs, and ray tracing with minimal power draw, the RTX PRO 4500 is the only option in this pairing. Neither card is a substitute for the other.

Head-to-Head Benchmarks

The head-to-head benchmark section in the database contains no entries, so there are no direct comparison scores between the MI300X and the RTX PRO 4500. However, the recorded single-benchmark data for the MI300X provides context. Its Geekbench OpenCL score of 317994 puts it ahead of the NVIDIA L40S (295763) by 7.5% and ahead of the RTX 6000 Ada Generation (287237) by 10.7%. It trails the NVIDIA H200 NVL (334891) by 5% and the NVIDIA B200 (345482) by 8%. These deltas show that the MI300X competes near the top of the database, within a single-digit percentage of the fastest NVIDIA accelerators.

The RTX PRO 4500 has no benchmark entries, so its measured performance cannot be compared directly. The only quantitative comparison available is from the specification fields. In FP32, the MI300X achieves 81.72 TFLOPS versus 50.70 TFLOPS for the RTX PRO 4500, a 61% lead. In FP16, the same ratio holds at 81.72 TFLOPS versus 50.70 TFLOPS. In memory bandwidth, the MI300X leads 5.32 TB/s versus 800.3 GB/s, a 6.6x gap. In texture rate, the MI300X delivers 2,553.6 GTexel/s versus 792.1 GTexel/s for the RTX PRO 4500, a 3.2x lead. The MI300X also has more shading units (19456 versus 10496) and more TMUs (1216 versus 328). The RTX PRO 4500 counters with a higher boost clock (2415 MHz versus 2100 MHz), a higher base clock (1215 MHz versus 1000 MHz), and a much higher pixel rate (270.5 GPixel/s versus 0 MPixel/s). The MI300X has no ROPs and no pixel output, so it cannot rasterize at all.

The RTX PRO 4500 wins on pixel throughput because it has 112 ROPs and a functional graphics pipeline, while the MI300X reports 0 ROPs and 0 MPixel/s. That is a fundamental architectural difference, not a performance nuance. The MI300X is not designed to output pixels, whereas the RTX PRO 4500 is a full graphics-capable processor despite being a server card.

FAQ

Q: Which card has more memory bandwidth?

A: The AMD Instinct MI300X has 5.32 TB/s of bandwidth from HBM3 on an 8192-bit bus. The NVIDIA RTX PRO 4500 has 800.3 GB/s from GDDR7 on a 256-bit bus.

Q: Does the RTX PRO 4500 support ray tracing?

A: Yes, the RTX PRO 4500 has 82 RT cores. The MI300X has no RT cores listed.

Q: What is the power draw difference?

A: The MI300X has a 750 W TDP and a suggested PSU of 1150 W. The RTX PRO 4500 has a 165 W TDP and a suggested PSU of 450 W.

Q: Can either card output video?

A: No. Both the MI300X and the RTX PRO 4500 list "No outputs" for display outputs.

Q: Which card has more memory capacity?

A: The MI300X has 192 GB of HBM3. The RTX PRO 4500 has 32 GB of GDDR7.

Q: What API support does each card offer?

A: The RTX PRO 4500 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300X lists N/A for DirectX, OpenGL, and Vulkan.

Architecture Differences

The two cards are built on different architectures from different vendors. The MI300X uses AMD's CDNA 3.0 architecture on a chip called Aqua Vanjaram, while the RTX PRO 4500 uses NVIDIA's Blackwell 2.0 architecture on the GB203 chip. Both are fabricated by TSMC on a 5 nm process, but the die sizes diverge dramatically. The MI300X has a die size of 1017 mm² and contains 153,000 million transistors, for a density of 150.4 million transistors per mm². The RTX PRO 4500 has a die size of 378 mm² and contains 45,600 million transistors, for a density of 120.6 million transistors per mm². The MI300X is nearly three times the die area and over three times the transistor count.

The MI300X has 19456 shading units and 1216 TMUs but 0 ROPs, indicating a compute-focused design with no rasterization pipeline. The RTX PRO 4500 has 10496 shading units, 328 TMUs, and 112 ROPs, making it a full graphics processor. The RTX PRO 4500 also includes 82 RT cores and 328 tensor cores, while the MI300X has no RT cores and no tensor core count listed. The MI300X reports a pixel rate of 0 MPixel/s, while the RTX PRO 4500 reports 270.5 GPixel/s.

The memory subsystems differ at a fundamental level. The MI300X uses HBM3 with a 8192-bit bus, while the RTX PRO 4500 uses GDDR7 with a 256-bit bus. The MI300X's memory clock is 1300 MHz with 5.2 Gbps effective, while the RTX PRO 4500's memory clock is 1563 MHz with 25 Gbps effective. The GDDR7 memory runs at a much higher effective data rate per pin, but the HBM3 implementation wins on total bandwidth due to the massive bus width.

The MI300X is an OAM module with no power connectors, whereas the RTX PRO 4500 is a single-slot PCIe card with one 16-pin connector. The MI300X has no display outputs, and the RTX PRO 4500 also has no display outputs, but the NVIDIA card supports a full graphics API stack. The MI300X does not support DirectX, OpenGL, or Vulkan.

The RTX PRO 4500 is marked as Active in production status, has a listed successor (Server Rubin), and a predecessor (Server Hopper). The MI300X has no production status listed, a predecessor of Radeon Instinct, and no successor. The release dates differ as well: the MI300X launched on 2023-12-05, while the RTX PRO 4500 is dated 2026-03-16.

Specification Differences

The table below highlights only the fields where the two cards differ. Both use PCIe 5.0 x16 as the bus interface, and both have no display outputs.

| Specification | AMD Instinct MI300X | 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 Clock | 1300 MHz 5.2 Gbps effective | 1563 MHz 25 Gbps effective |

| Memory Size | 192 GB | 32 GB |

| Memory Type | HBM3 | GDDR7 |

| Memory Bus Width | 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 | None | 82 |

| Tensor Cores | None | 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 10.5 inches, 111 mm 4.4 inches, 40 mm 1.6 inches |

| Production Status | Not listed | Active |

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

| Predecessor | Radeon Instinct | Server Hopper |

| Successor | Not listed | Server Rubin |