AMD Instinct MI300 vs AMD Radeon PRO W7900 Comparison

Where Each One Wins

The data splits the two AMD accelerators into entirely different roles. The Instinct MI300 is a compute-oriented part with no display outputs, no graphics API support, and a massive memory pool. Its benchmark presence in the database is effectively absent, with a 50th percentile ranking among all GPUs and an average benchmark score of zero. The Radeon PRO W7900, by contrast, is a fully featured workstation card that sits at the 94th percentile, with a recorded Geekbench OpenCL score of 84,379 and a Geekbench Vulkan score of 137,070.

If the workload involves rendering to a screen, running DirectX or Vulkan applications, or leveraging graphics APIs, the PRO W7900 is the only option that can do it. The MI300 cannot, as its API support is listed as N/A across DirectX, OpenGL, and Vulkan, and it has no display outputs. Conversely, if the task involves large memory footprints, the MI300's 128 GB of HBM3 versus the W7900's 48 GB of GDDR6 points clearly to the Instinct part as the one for data-heavy compute workloads.

The transistor counts reinforce the split. The MI300 uses 153,000 million transistors across a 1017 mm² die, while the W7900 uses 57,700 million on a 529 mm² die. That difference in scale, combined with the memory disparity, tells the practical story: the MI300 is built for throughput in large-scale compute, while the W7900 is built for workstation graphics with a side of compute.

Architecture Differences

Both chips are fabricated on TSMC's 5 nm process, but the underlying architectures diverge sharply. The MI300 uses CDNA 3.0 with the Aqua Vanjaram chip, aimed at compute acceleration. The W7900 uses RDNA 3.0 with the Navi 31 chip, codenamed Plum Bonito, which is a graphics-first design.

The MI300 has 14,080 shading units and 880 texture mapping units, but zero ROPs. Its pixel rate is 0 MPixel/s, which confirms it cannot rasterize frames. The W7900 has 6,144 shading units, 384 TMUs, and 192 ROPs, with a pixel rate of 479.0 GPixel/s. It also carries 96 ray tracing cores, something the MI300 lacks entirely. The MI300 has no listed tensor cores, and neither does the W7900, but the RDNA 3 part clearly handles graphics features while the CDNA part ignores them.

Memory architecture differs at every level. The MI300 uses HBM3 with a 8192-bit bus and 5.32 TB/s of bandwidth, while the W7900 uses GDDR6 with a 384-bit bus and 864.0 GB/s. The MI300's memory clock is listed at 1300 MHz with 5.2 Gbps effective, while the W7900 runs at 2250 MHz with 18 Gbps effective. The bus width difference is the dominant factor: 8192 bits versus 384 bits gives the MI300 a massive bandwidth advantage, over six times the W7900's figure.

Clock speeds tell the opposite story. The MI300 has a base clock of 1000 MHz and a boost of 1700 MHz. The W7900 starts at 1760 MHz and boosts to 2495 MHz. Higher clocks on the W7900 help its FP32 throughput reach 61.32 TFLOPS, which beats the MI300's 47.87 TFLOPS, despite the MI300 having more than double the shading units. Both parts list FP16 at the same rate as FP32, a 1:1 ratio.

The PCIe interface differs as well. The MI300 uses PCIe 5.0 x16, while the W7900 uses PCIe 4.0 x16. Power requirements follow the performance profile: the MI300 draws a 600 W TDP with a 1000 W suggested PSU, while the W7900 draws 295 W with a 600 W suggested PSU. Both use 2x 8-pin power connectors.

Head-to-Head Benchmarks

The database records no direct head-to-head benchmark results between these two cards, and the wins column shows zero for each. The available comparison therefore relies on the W7900's standalone scores and the MI300's absence of any recorded benchmarks.

The Radeon PRO W7900 posts an average benchmark score of 110,725. Its nearest rivals in the database include the AMD Radeon Pro Vega II at 109,617, which is 1% slower, and the AMD Radeon Pro W6600X at 107,342, which is 3.2% slower. On the other side, the NVIDIA RTX A5500 Mobile scores 113,944, which is 2.8% faster, and the NVIDIA Tesla V100 SXM2 16 GB scores 114,395, which is 3.2% faster. This places the W7900 in a tight cluster where it edges out two AMD workstation cards but trails two NVIDIA parts by small margins.

The MI300 has no benchmark scores, no rivals, and a 50th percentile ranking that reflects its zero score. The data cannot support any claim of a head-to-head victory for the MI300 in raw benchmark numbers, because no such numbers exist in the database.

The practical takeaway from the recorded data is that the W7900 is a proven performer in the workstation segment, sitting above the 90th percentile. The MI300's 50th percentile is not a measure of poor performance but rather a placeholder for a card that has not been benchmarked in this database. The distinction matters: the MI300's specifications suggest compute capability, but the absence of scores means no quantitative comparison can be made.

FAQ

Q: Which card has more memory bandwidth?

A: The Instinct MI300 offers 5.32 TB/s from its HBM3 memory on a 8192-bit bus. The Radeon PRO W7900 offers 864.0 GB/s from GDDR6 on a 384-bit bus.

Q: Can the Instinct MI300 output video to a display?

A: No. The MI300 lists no display outputs and has a pixel rate of 0 MPixel/s. The W7900 has 3x DisplayPort 2.1 and 1x mini-DisplayPort 2.1 outputs.

Q: What is the FP32 compute difference between the two?

A: The W7900 achieves 61.32 TFLOPS FP32, while the MI300 achieves 47.87 TFLOPS FP32. Both list FP16 at the same rate as FP32.

Q: How does the W7900 compare to its nearest rivals?

A: The W7900's average benchmark score of 110,725 is 1% above the Radeon Pro Vega II and 3.2% above the Radeon Pro W6600X. It trails the NVIDIA RTX A5500 Mobile by 2.8% and the NVIDIA Tesla V100 SXM2 16 GB by 3.2%.

Q: Which card has a higher boost clock?

A: The W7900 boosts to 2495 MHz, while the MI300 boosts to 1700 MHz. The W7900 also has a higher base clock at 1760 MHz versus 1000 MHz.

Q: What graphics APIs does each card support?

A: The W7900 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300 lists N/A for DirectX, OpenGL, and Vulkan.

The Verdict

The data supports a clear division of roles. The Radeon PRO W7900 is the only one of the two that can function as a graphics card. It has display outputs, rasterization hardware with 192 ROPs, 96 ray tracing cores, and full support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its benchmark results place it at the 94th percentile, with an average score of 110,725 that sits within a few percent of several strong workstation rivals. For anyone needing a GPU that drives monitors and runs graphics workloads, the W7900 is the choice.

The Instinct MI300 targets a different user. Its 128 GB of HBM3 memory and 5.32 TB/s bandwidth, combined with a 8192-bit bus, point toward large-scale compute tasks that exceed the W7900's 48 GB capacity. The MI300's lack of display outputs and graphics APIs means it is not a workstation card in the traditional sense. Its 600 W TDP and 1000 W suggested PSU also indicate a system built for compute density rather than desktop flexibility.

The FP32 numbers favor the W7900, which delivers 61.32 TFLOPS versus the MI300's 47.87 TFLOPS. That is a meaningful gap for general compute workloads that rely on FP32. The MI300's advantage lies in memory capacity and bandwidth, not raw floating-point throughput as measured in this database.

The production status also differs. The W7900 is listed as Active, while the MI300 has no production status recorded. The W7900 also has a launch MSRP of 3,999 USD, while the MI300 has no such field. Neither card has a successor listed.

The verdict from the data is straightforward: the W7900 is the graphics-capable workstation card with proven benchmark performance, and the MI300 is the memory-heavy compute accelerator with no graphics functionality and no recorded benchmark scores. A user with rendering, display, or graphics API needs should choose the W7900. A user with massive memory capacity requirements and no need for display output should consider the MI300, but the database provides no performance scores to validate that choice.

Specification Differences

| Field | AMD Instinct MI300 | AMD Radeon PRO W7900 |

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

| Chip | Aqua Vanjaram | Navi 31 |

| Architecture | CDNA 3.0 | RDNA 3.0 |

| Codename | None | Plum Bonito |

| 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 | 1760 MHz |

| Boost Clock | 1700 MHz | 2495 MHz |

| Memory Clock | 1300 MHz 5.2 Gbps effective | 2250 MHz 18 Gbps effective |

| Memory Size | 128 GB | 48 GB |

| Memory Type | HBM3 | GDDR6 |

| Memory Bus Width | 8192 bit | 384 bit |

| Memory Bandwidth | 5.32 TB/s | 864.0 GB/s |

| Shading Units | 14080 | 6144 |

| TMUs | 880 | 384 |

| ROPs | 0 | 192 |

| Ray Tracing Cores | None | 96 |

| Pixel Rate | 0 MPixel/s | 479.0 GPixel/s |

| Texture Rate | 1,496.0 GTexel/s | 958.1 GTexel/s |

| FP32 | 47.87 TFLOPS | 61.32 TFLOPS |

| FP16 | 47.87 TFLOPS (1:1) | 61.32 TFLOPS (1:1) |

| TDP | 600 W | 295 W |

| Slot Width | Not specified | Triple-slot |

| Power Connectors | 2x 8-pin | 2x 8-pin |

| Suggested PSU | 1000 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 |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Length | 267 mm, 10.5 inches | 280 mm, 11 inches |

| Height | 111 mm, 4.4 inches | 110 mm, 4.3 inches |

| Width | Not specified | 51 mm, 2 inches |

| Production Status | Not specified | Active |

| Release Date | 2023-01-03 | 2023-05-25 |

| Predecessor | Radeon Instinct | Radeon Pro Vega |

| Launch MSRP | None | 3,999 USD |