AMD Instinct MI300X vs AMD Radeon PRO W7800 Comparison

The AMD Instinct MI300X and AMD Radeon PRO W7800 represent two distinct philosophies from the same manufacturer, targeting vastly different computational workloads. The data, drawn from Geekbench OpenCL results, reveals a stark performance hierarchy, with the MI300X delivering a score of 317,994 compared to the W7800’s 154,366. This translates to a 106% delta, meaning the Instinct card is more than twice as fast in this specific compute test. While the W7800 also has a Vulkan score of 175,422, the head-to-head comparison is solely based on OpenCL, where the MI300X secures the only win.

Head-to-Head Benchmarks

The single decisive benchmark in the data is Geekbench OpenCL, a raw compute test that heavily favors the MI300X. The score difference is not marginal; it is a complete rout. The MI300X’s score of 317,994 is more than double the W7800’s 154,366, resulting in a 106% performance advantage. This is not a case of one card being slightly quicker; it is a case of one card being in an entirely different performance class for compute workloads.

Contextualizing the MI300X’s performance against its own rivals shows that its lead over the W7800 is part of a broader trend. The MI300X is 10.7% faster than the NVIDIA RTX 6000 Ada Generation and 7.5% faster than the NVIDIA L40S. It does trail the NVIDIA B200 by 8% and the NVIDIA H200 NVL by 5%, but its standing among these top-tier accelerators places it in the 100th percentile of all GPUs. The W7800, by contrast, sits in the 97th percentile, a strong position for a workstation card, but its nearest rivals are all within a narrow band. It is nearly identical to the NVIDIA RTX A5500, being just 0.2% slower, and is 0.7% slower than the RTX 4500 Ada Generation. It is 1.5% faster than the NVIDIA A100 PCIe 40 GB and 2.2% slower than the AMD Radeon Pro W6900X.

These figures paint a clear picture. The MI300X’s 106% lead over the W7800 is far larger than the single-digit percentage differences seen when comparing each card to its direct competitors. This suggests that the MI300X and W7800 are not meant to compete with each other. The benchmark results indicate that the MI300X is an accelerator designed for maximum compute throughput, while the W7800 is a more balanced professional GPU. The delta between them is a chasm, and the data shows that any application relying on the OpenCL compute performance measured here will see a dramatic difference in execution time.

Architecture Differences

The architectural divide between these two GPUs is fundamental, starting with their respective design goals. The MI300X is built on the CDNA 3.0 architecture, codenamed Aqua Vanjaram, and is part of the Instinct (MIx) generation. This is a compute-optimized design with no display outputs, indicating its purpose is pure calculation. In contrast, the W7800 uses the RDNA 3.0 architecture, codenamed Plum Bonito, from the Radeon Pro Navi (Navi III Series) generation. This is a graphics-first architecture, complete with a full suite of display outputs, including 3x DisplayPort 2.1 and 1x mini-DisplayPort 2.1, and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI300X, lacking any display outputs, has no API support listed.

The physical scale of the chips reinforces this divergence. The MI300X is a massive 1017 mm² die fabricated on a 5 nm process at TSMC, housing 153,000 million transistors. This leads to a transistor density of 150.4M / mm². The W7800’s Navi 31 chip is also built on TSMC’s 5 nm node, but it is a smaller 529 mm² die with 57,700 million transistors, resulting in a density of 109.1M / mm². The sheer difference in transistor count—153 billion versus 57.7 billion—explains the massive gap in compute resources.

Memory architecture is another critical differentiator. The MI300X is equipped with 192 GB of HBM3 memory on a massive 8192-bit bus, delivering 5.32 TB/s of bandwidth. This is a staggering amount of memory and bandwidth, designed for large models and datasets. The W7800, conversely, has 32 GB of GDDR6 memory on a 256-bit bus, providing 576.0 GB/s of bandwidth. This is a substantial amount for a workstation card, but it is a fraction of the MI300X’s capacity and throughput. The clock speeds also differ, with the MI300X having a base clock of 1000 MHz and a boost of 2100 MHz, while the W7800 has a higher base of 1895 MHz and boost of 2525 MHz. Yet, the W7800’s higher clocks cannot compensate for the MI300X’s overwhelming advantage in core count and memory bandwidth.

The Verdict

Strictly from the data, the choice between these two GPUs is a matter of workload, not preference. The AMD Instinct MI300X is the clear winner for raw compute performance. Its 106% lead in OpenCL benchmarks, combined with its 192 GB of HBM3 memory and 5.32 TB/s of bandwidth, makes it the only logical choice for compute-intensive tasks like large-scale AI training or scientific simulation. Its 100th percentile ranking, ahead of cards like the NVIDIA RTX 6000 Ada Generation by 10.7%, underscores its position as a top-tier accelerator.

The AMD Radeon PRO W7800, however, is not a poor performer; it is a different tool. Its 97th percentile score and its near-tie with the NVIDIA RTX A5500 (0.2% slower) and RTX 4500 Ada Generation (0.7% slower) show it is a competitive workstation GPU. Crucially, it has features the MI300X completely lacks: display outputs and full graphics API support. The data indicates the W7800 is designed for professional visualization, content creation, and any workload that requires rendering to a screen. It also requires far less power, with a 260 W TDP versus the MI300X’s 750 W, and a suggested PSU of 600 W versus 1150 W. For a user who needs a GPU for 3D modeling, video editing, or CAD, the W7800 is the appropriate choice. For a user who needs to process massive datasets or train neural networks, the MI300X is the only option that makes sense.

Specification Differences

The following table highlights the key specification differences where the two GPUs diverge.

| Feature | AMD Instinct MI300X | AMD Radeon PRO W7800 |

| :--- | :--- | :--- |

| Architecture | CDNA 3.0 | RDNA 3.0 |

| Chip | Aqua Vanjaram | Navi 31 |

| Generation | Instinct (MIx) | Radeon Pro Navi (Navi III Series) |

| Transistors | 153,000 million | 57,700 million |

| Die Size | 1017 mm² | 529 mm² |

| Transistor Density | 150.4M / mm² | 109.1M / mm² |

| Base Clock | 1000 MHz | 1895 MHz |

| Boost Clock | 2100 MHz | 2525 MHz |

| Memory Size | 192 GB | 32 GB |

| Memory Type | HBM3 | GDDR6 |

| Memory Bus | 8192 bit | 256 bit |

| Memory Bandwidth | 5.32 TB/s | 576.0 GB/s |

| Shading Units | 19456 | 4480 |

| TMUs | 1216 | 280 |

| ROPs | 0 | 128 |

| RT Cores | N/A | 70 |

| Pixel Rate | 0 MPixel/s | 323.2 GPixel/s |

| Texture Rate | 2,553.6 GTexel/s | 707.0 GTexel/s |

| FP32 | 81.72 TFLOPS | 45.25 TFLOPS |

| FP16 | 81.72 TFLOPS (1:1) | 90.50 TFLOPS (2:1) |

| TDP | 750 W | 260 W |

| Slot Width | OAM Module | Dual-slot |

| Power Connectors | None | 2x 8-pin |

| Suggested PSU | 1150 W | 600 W |

| Bus Interface | PCIe 5.0 x16 | PCIe 4.0 x16 |

| Display Outputs | No outputs | 3x DisplayPort 2.1, 1x mini-DisplayPort 2.1 |

| APIs | N/A | DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4 |

FAQ

Q: Which GPU is faster in the Geekbench OpenCL benchmark?

A: The AMD Instinct MI300X is faster, scoring 317,994 compared to the AMD Radeon PRO W7800's 154,366, a 106% difference.

Q: What is the primary memory difference between the two cards?

A: The MI300X has 192 GB of HBM3 memory with a bandwidth of 5.32 TB/s, while the W7800 has 32 GB of GDDR6 memory with a bandwidth of 576.0 GB/s.

Q: Can the AMD Instinct MI300X be used for graphics output?

A: No, the MI300X has no display outputs and no API support, making it a compute-only accelerator. The W7800, in contrast, has multiple DisplayPort outputs and supports DirectX, OpenGL, and Vulkan.

Q: How does the W7800 compare to its nearest rival, the NVIDIA RTX A5500?

A: The W7800 is nearly identical in performance, being just 0.2% slower than the RTX A5500 in average benchmark score.

Q: What is the difference in power consumption between the two GPUs?

A: The MI300X has a TDP of 750 W and requires a suggested PSU of 1150 W, whereas the W7800 has a TDP of 260 W and requires a suggested PSU of 600 W.

Q: Which card has a higher FP16 performance?

A: The W7800 has a higher FP16 performance at 90.50 TFLOPS (2:1), compared to the MI300X's 81.72 TFLOPS (1:1).

Where Each One Wins

The AMD Instinct MI300X wins in every scenario involving raw compute throughput. Its 106% lead in OpenCL, 81.72 TFLOPS of FP32 performance, and 5.32 TB/s of memory bandwidth make it the superior choice for large-scale AI model training, inference, and scientific computing. The 192 GB of HBM3 memory allows it to hold massive datasets entirely on the GPU, a crucial advantage. Its 100th percentile ranking and its wins over competitors like the NVIDIA L40S (7.5%) and RTX 6000 Ada Generation (10.7%) confirm its dominance in this space. This is the card for a server rack, not a desktop.

The AMD Radeon PRO W7800 wins in all scenarios requiring graphics output and professional visualization. Its display outputs, support for DirectX 12 Ultimate and Vulkan 1.4, and 70 RT cores make it ideal for 3D rendering, video editing, and CAD work. Its 128 ROPs and 323.2 GPixel/s pixel rate are features the MI300X does not have, as it reports 0 ROPs and 0 MPixel/s. While its FP32 performance is lower at 45.25 TFLOPS, its FP16 performance of 90.50 TFLOPS is higher than the MI300X's 81.72 TFLOPS, which could be beneficial in certain professional workloads that utilize FP16. Its lower power draw and smaller form factor also make it suitable for a workstation environment. The data shows the W7800 is a highly capable professional graphics card, while the MI300X is a dedicated compute accelerator.