AMD Instinct MI308X vs NVIDIA RTX PRO 6000 Blackwell Comparison

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark scores between the AMD Instinct MI308X and the NVIDIA RTX PRO 6000 Blackwell. The Instinct MI308X has zero recorded benchmark entries, zero average score, and zero wins in any comparative test. The RTX PRO 6000 Blackwell has exactly one recorded benchmark result: 3DMark Steel Nomad DX12, with a score of 16,408.

That single score places the RTX PRO 6000 Blackwell in the 59th percentile among all GPUs in the database. Its nearest rivals in that test are tightly clustered. The AMD Radeon PRO W7500 scores 16,415, a delta of 0% from the NVIDIA card. The AMD Radeon RX 5700 XT scores 16,361, a delta of 0.3% in favor of the NVIDIA. The AMD Radeon Pro 5600M scores 16,351, a delta of 0.4% in favor of the NVIDIA. Interestingly, the NVIDIA GeForce RTX 5090 D V2 scores 16,504, which puts the RTX PRO 6000 Blackwell 0.6% behind that card. The recorded data shows a razor-thin competitive window: the RTX PRO 6000 Blackwell essentially trades blows with mid-range and previous-generation cards in this specific test, rather than dominating them.

For the Instinct MI308X, the absence of benchmark data means no percentile ranking can be computed from actual runs. The database assigns it a percentile of 50 based on its specifications alone, but that is not derived from any measured workload. The head-to-head comparison for this pair is therefore incomplete: the RTX PRO 6000 Blackwell has a single verified result, while the MI308X has none. Any performance inference for the AMD card must come from its architecture and memory characteristics, not from recorded test outcomes.

FAQ

Q: Does the AMD Instinct MI308X have any benchmark results in the database?

A: No. The MI308X has an empty benchmarks list, an average benchmark score of 0, and zero wins in head-to-head comparisons. Its percentile of 50 is assigned from specifications, not from measured performance data.

Q: What is the RTX PRO 6000 Blackwell's only recorded benchmark score?

A: It scores 16,408 in 3DMark Steel Nomad DX12. This places it at the 59th percentile among all GPUs in the database.

Q: How does the RTX PRO 6000 Blackwell compare to its nearest rival, the AMD Radeon PRO W7500?

A: The Radeon PRO W7500 scores 16,415, which is 0% different from the RTX PRO 6000 Blackwell's 16,408. The two are effectively tied in this benchmark.

Q: Which card has more shading units?

A: The NVIDIA RTX PRO 6000 Blackwell has 24,064 shading units. The AMD Instinct MI308X has 19,456 shading units.

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

A: The Instinct MI308X has 192 GB of HBM3 memory on an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RTX PRO 6000 Blackwell has 96 GB of GDDR7 memory on a 512-bit bus, delivering 1.79 TB/s of bandwidth.

Q: Which card supports DirectX and Vulkan APIs?

A: Only the RTX PRO 6000 Blackwell has API support: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Instinct MI308X lists N/A for DirectX, OpenGL, and Vulkan.

Architecture Differences

The two cards come from fundamentally different design philosophies. The AMD Instinct MI308X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, part of the Instinct (MIx) generation. The NVIDIA RTX PRO 6000 Blackwell uses the Blackwell 2.0 architecture with the GB202 chip, part of the Blackwell PRO W (x000) generation. Both are manufactured on a 5 nm process at TSMC, but the transistor counts diverge sharply. The MI308X packs 153,000 million transistors on a 1017 mm² die, yielding a density of 150.4 million transistors per square millimeter. The RTX PRO 6000 Blackwell contains 92,200 million transistors on a 750 mm² die, with a density of 122.9 million per square millimeter. The AMD chip is therefore both larger and denser.

The MI308X is built for compute-first workloads with no graphical output. It has zero ROPs, zero pixel rate, and no display outputs. Its API support is entirely absent: DirectX, OpenGL, and Vulkan are all listed as N/A. The RTX PRO 6000 Blackwell, by contrast, is a full workstation GPU with 192 ROPs, a pixel rate of 502.5 GPixel/s, 188 RT cores, 752 tensor cores, and 4x DisplayPort 2.1b outputs. It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The NVIDIA card is also a dual-slot design with a 16-pin power connector, whereas the MI308X is an OAM module with no power connectors and no display outputs.

The texture pipelines differ in configuration. The MI308X has 1,216 TMUs and a texture rate of 2,553.6 GTexel/s. The RTX PRO 6000 Blackwell has 752 TMUs and a texture rate of 1,968.0 GTexel/s. The AMD card has more TMUs and a higher texture throughput, but the NVIDIA card has more shading units (24,064 vs 19,456) and a higher FP32 peak (126.0 TFLOPS vs 81.72 TFLOPS). Both cards deliver FP16 at a 1:1 ratio with FP32: the MI308X at 81.72 TFLOPS and the RTX PRO 6000 Blackwell at 126.0 TFLOPS.

Clock behavior also separates the two. The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The RTX PRO 6000 Blackwell has a base clock of 1590 MHz and a boost clock of 2617 MHz. The NVIDIA card runs at higher frequencies across the board, which partially explains its higher FP32 throughput despite having fewer TMUs.

Specification Differences

The two cards differ across nearly every measurable specification. Memory capacity: the MI308X has 192 GB, the RTX PRO 6000 Blackwell has 96 GB. Memory type: HBM3 for AMD, GDDR7 for NVIDIA. Memory bus width: 8192 bit versus 512 bit. Memory bandwidth: 5.32 TB/s versus 1.79 TB/s. Memory clock: 1300 MHz (5.2 Gbps effective) versus 1750 MHz (28 Gbps effective).

Shading units: 19,456 for AMD, 24,064 for NVIDIA. TMUs: 1,216 for AMD, 752 for NVIDIA. ROPs: 0 for AMD, 192 for NVIDIA. RT cores: none for AMD, 188 for NVIDIA. Tensor cores: none for AMD, 752 for NVIDIA. Pixel rate: 0 MPixel/s for AMD, 502.5 GPixel/s for NVIDIA. Texture rate: 2,553.6 GTexel/s for AMD, 1,968.0 GTexel/s for NVIDIA.

FP32 compute: 81.72 TFLOPS for AMD, 126.0 TFLOPS for NVIDIA. FP16 compute: 81.72 TFLOPS for AMD, 126.0 TFLOPS for NVIDIA. TDP: 750 W for AMD, 600 W for NVIDIA. Suggested PSU: 1150 W for AMD, 1000 W for NVIDIA. Slot width: OAM Module for AMD, dual-slot for NVIDIA. Power connectors: none for AMD, 1x 16-pin for NVIDIA.

Physical dimensions: the RTX PRO 6000 Blackwell measures 304 mm in length, 137 mm in height, and 40 mm in width. The MI308X has no recorded dimensions. Display outputs: none for AMD, 4x DisplayPort 2.1b for NVIDIA. API support: N/A for AMD across the board, DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 for NVIDIA.

Release dates differ by over a year. The MI308X was released on December 5, 2023. The RTX PRO 6000 Blackwell was released on March 17, 2025. The NVIDIA card has an active production status; the AMD card has no production status recorded. The MI308X lists a predecessor of Radeon Instinct. The NVIDIA card lists a predecessor of Workstation Ada. The launch MSRP for the RTX PRO 6000 Blackwell is 8,565 USD, stated once here as recorded in the database. The MI308X has no launch MSRP recorded.

Where Each One Wins

The MI308X wins decisively in memory capacity and bandwidth. Its 192 GB of HBM3 on an 8192-bit bus delivers 5.32 TB/s, which is roughly triple the 1.79 TB/s of the RTX PRO 6000 Blackwell. For workloads that are memory-bound, such as large model inference or massive dataset processing, the AMD card has a structural advantage that no clock speed or shader count can overcome. Its texture rate of 2,553.6 GTexel/s also exceeds the NVIDIA card's 1,968.0 GTexel/s, and its 1,216 TMUs outnumber the NVIDIA card's 752.

The RTX PRO 6000 Blackwell wins in raw FP32 and FP16 compute. Its 126.0 TFLOPS in both precision modes is about 54% higher than the MI308X's 81.72 TFLOPS. It also has more shading units (24,064 vs 19,456), higher clock speeds (2617 MHz boost vs 2100 MHz boost), and the only ray tracing and tensor core hardware in this comparison. The NVIDIA card is the only one with display outputs, API support, and a conventional PCIe slot form factor. It is also smaller in power draw: 600 W TDP versus 750 W, with a 1000 W suggested PSU versus 1150 W.

The benchmark evidence, such as it exists, favors the NVIDIA card in the one recorded test. The 3DMark Steel Nomad score of 16,408 places it at the 59th percentile, above the MI308X's specification-only percentile of 50. However, the MI308X cannot run that test at all, since it has no DirectX support. The comparison is thus asymmetrical: the NVIDIA card competes in graphics and general compute benchmarks, while the AMD card is confined to compute-only environments where its memory subsystem is the primary asset.

The Verdict

The data supports a clear split based on workload type. The AMD Instinct MI308X is a memory-capacity specialist. Its 192 GB of HBM3 with 5.32 TB/s bandwidth is the largest memory configuration in this comparison, and its absence of display outputs, ROPs, and API support confirms a design aimed at server-side compute, not interactive graphics. The RTX PRO 6000 Blackwell is the generalist: it has more shading units, higher FP32 and FP16 throughput, ray tracing and tensor cores, display outputs, and full API compatibility. Its single benchmark result shows competitive performance in a DirectX 12 workload, sitting within 0.6% of the GeForce RTX 5090 D V2 and effectively tied with the Radeon PRO W7500.

For users who need maximum memory bandwidth and capacity for large-scale compute tasks, the MI308X is the only option between these two. For users who need a workstation GPU with graphics output, ray tracing, and broad software API support, the RTX PRO 6000 Blackwell is the only option. The MI308X has no recorded benchmark scores, so its compute performance cannot be verified from the database. The RTX PRO 6000 Blackwell has one verified score, and that score indicates solid, mid-pack performance rather than dominance. The percentile difference, 59 versus 50, reflects the NVIDIA card's measured result against the AMD card's unmeasured specification estimate, and should be read with that caveat in mind.