AMD Instinct MI308X vs NVIDIA RTX PRO 4000 Blackwell Comparison

Head-to-Head Benchmarks

The recorded data does not contain any direct head-to-head benchmark comparisons between the AMD Instinct MI308X and the NVIDIA RTX PRO 4000 Blackwell. The head-to-head benchmark array is empty, and neither product has a win count recorded in the database. This absence of comparative benchmark data means that any direct performance matchup cannot be quantified with specific scores or deltas.

For the NVIDIA RTX PRO 4000 Blackwell, the database lists a set of individual benchmark results. Its 3DMark Steel Nomad DX12 score is 4,648, while its Geekbench Vulkan result reaches 194,168. In the Passmark suite, the GPU posts scores of 173 in DirectX 10, 276 in DirectX 11, 97 in DirectX 12, and 354 in DirectX 9. The Passmark G2D score is 1,265, and the G3D score is 28,427. Its Passmark GPU Compute result is 14,805. The average benchmark score across these tests is 27,135.

The AMD Instinct MI308X has no benchmark scores recorded in the database. Its average benchmark score is listed as 0, and its percentile versus all GPUs is 50. The NVIDIA RTX PRO 4000 Blackwell, by contrast, holds a percentile of 72 among all GPUs. This percentile difference indicates that the NVIDIA part sits higher in the overall performance distribution, although the absence of MI308X scores prevents a direct numerical comparison.

The nearest rivals for the NVIDIA RTX PRO 4000 Blackwell, based on average benchmark scores, provide context for its performance tier. The AMD Radeon RX 6700 XT has an average score of 27,425, which is 1.1 percent higher than the RTX PRO 4000's average. The NVIDIA GeForce RTX 4070 Mobile posts 27,435, also 1.1 percent higher. The NVIDIA GeForce RTX 3090 reaches 27,565, sitting 1.6 percent above. The NVIDIA RTX A4000 comes in at 26,683, which is 1.7 percent lower than the RTX PRO 4000. These deltas show the RTX PRO 4000 Blackwell clustered tightly with these established GPUs, within roughly two percent either direction.

The Verdict

The benchmark data indicates a clear split in intended roles rather than a direct performance contest. The NVIDIA RTX PRO 4000 Blackwell has recorded scores and holds a 72nd percentile position among all GPUs, placing it in the upper performance tier. The AMD Instinct MI308X has no benchmark scores, an average score of zero, and a 50th percentile, which reflects its lack of measured results rather than an actual performance level.

For a workstation GPU with measurable performance, the RTX PRO 4000 Blackwell delivers: its 3DMark Steel Nomad score of 4,648 and Passmark G3D score of 28,427 demonstrate solid DirectX and graphics workloads. Its nearest rivals, all within 1.7 percent of its average score, confirm that it competes with the RTX 3090 and RX 6700 XT class of GPUs. The data supports the RTX PRO 4000 as the choice for users needing verified, benchmarked graphics performance.

The AMD Instinct MI308X offers no recorded benchmark data, so its performance cannot be validated from the database. The data shows the MI308X targets a different segment entirely: it uses HBM3 memory with 192 GB capacity and an 8,192-bit bus, which points to large-scale compute workloads rather than standard graphics benchmarks. Users requiring proven graphics scores should select the NVIDIA part based on the available data. Those needing massive memory capacity for specialized compute tasks may consider the AMD part, but the database provides no performance verification for it.

Architecture Differences

The two GPUs share a 5 nm process node from TSMC, but their architectures diverge completely. The AMD Instinct MI308X uses CDNA 3.0 architecture on a chip called Aqua Vanjaram. The NVIDIA RTX PRO 4000 Blackwell uses Blackwell 2.0 architecture on the GB203 chip. These are fundamentally different design philosophies: CDNA focuses on compute throughput, while Blackwell integrates graphics and compute features.

The transistor counts differ substantially. The MI308X contains 153,000 million transistors on a 1,017 mm² die, giving a transistor density of 150.4 million per square millimeter. The RTX PRO 4000 has 45,600 million transistors on a 378 mm² die, with a density of 120.6 million per square millimeter. The MI308X's die is nearly three times larger and packs over three times the transistors, reflecting its compute-oriented design.

The rendering pipelines show a stark contrast. The MI308X has 19,456 shading units and 1,216 texture mapping units, but zero ROPs and zero pixel rate, indicating it lacks a traditional graphics output pipeline. The RTX PRO 4000 has 8,960 shading units, 280 TMUs, and 96 ROPs, with a pixel rate of 197.3 GPixel/s and a texture rate of 575.4 GTexel/s. The NVIDIA part also includes 70 RT cores and 280 tensor cores, while the MI308X lists no RT or tensor core counts.

API support differs completely. The MI308X lists DirectX, OpenGL, and Vulkan as N/A, confirming it is not designed for standard graphics APIs. The RTX PRO 4000 supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it a full-featured graphics card.

Specification Differences

The memory subsystems diverge sharply. The MI308X uses 192 GB of HBM3 memory on an 8,192-bit bus, achieving 5.32 TB/s bandwidth. The RTX PRO 4000 uses 24 GB of GDDR7 memory on a 192-bit bus, with 672.0 GB/s bandwidth. The MI308X offers eight times the capacity and nearly eight times the bandwidth.

Clock speeds differ modestly. The MI308X has a base clock of 1,000 MHz and a boost clock of 2,100 MHz, with memory at 1,300 MHz (5.2 Gbps effective). The RTX PRO 4000 has a base clock of 1,230 MHz and a boost of 2,055 MHz, with memory at 1,750 MHz (28 Gbps effective).

Compute throughput shows the MI308X's advantage. It delivers 81.72 TFLOPS in both FP32 and FP16 (1:1 ratio). The RTX PRO 4000 delivers 36.83 TFLOPS in FP32 and FP16 (1:1). The MI308X more than doubles the FP32 throughput.

Power and physical specifications differ dramatically. The MI308X has a TDP of 750 W, uses an OAM module slot width, has no power connectors listed, and suggests a 1,150 W power supply. It has no display outputs. The RTX PRO 4000 has a TDP of 140 W, fits in a single slot, uses one 16-pin power connector, suggests a 300 W power supply, and offers four DisplayPort 2.1b outputs. Its dimensions are 241 mm by 111 mm by 20 mm.

Release dates and lineage also differ. The MI308X released on December 5, 2023, with the Radeon Instinct as its predecessor. The RTX PRO 4000 released on March 17, 2025, succeeding Workstation Ada. The RTX PRO 4000 has an active production status, while the MI308X's status is not listed. Neither product has a launch MSRP in the database.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI308X delivers 81.72 TFLOPS in FP32, compared to 36.83 TFLOPS for the NVIDIA RTX PRO 4000 Blackwell. The MI308X more than doubles the FP32 throughput.

Q: How much memory does each GPU offer?

A: The MI308X has 192 GB of HBM3 memory on an 8,192-bit bus with 5.32 TB/s bandwidth. The RTX PRO 4000 has 24 GB of GDDR7 memory on a 192-bit bus with 672.0 GB/s bandwidth.

Q: Does the AMD Instinct MI308X support DirectX?

A: No. The database lists DirectX, OpenGL, and Vulkan support as N/A for the MI308X. The RTX PRO 4000 supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Q: What is the power consumption difference?

A: The MI308X has a TDP of 750 W and suggests a 1,150 W power supply. The RTX PRO 4000 has a TDP of 140 W and suggests a 300 W power supply.

Q: Which GPU has display outputs?

A: The RTX PRO 4000 has four DisplayPort 2.1b outputs. The MI308X has no display outputs.

Q: How does the RTX PRO 4000 compare to its nearest rival, the RTX 3090?

A: The RTX PRO 4000 has an average benchmark score of 27,135, which is 1.6 percent lower than the RTX 3090's average score of 27,565.

Where Each One Wins

The AMD Instinct MI308X wins on raw compute capacity and memory scale. Its 81.72 TFLOPS FP32 and FP16 performance, combined with 192 GB of HBM3 memory and 5.32 TB/s bandwidth, positions it for large-scale compute tasks. The 8,192-bit memory bus and 153,000 million transistors indicate a design optimized for massive parallel workloads. Its 750 W TDP and OAM module form factor show it is intended for server or accelerator environments, not desktop use.

The NVIDIA RTX PRO 4000 Blackwell wins on verified graphics performance and versatility. Its benchmark scores, including 28,427 in Passmark G3D and 194,168 in Geekbench Vulkan, demonstrate strong measured results. The 96 ROPs, 70 RT cores, and 280 tensor cores provide full graphics and ray tracing capabilities. Its four DisplayPort 2.1b outputs and 241 mm length make it suitable for workstation installations. The 140 W TDP and 300 W suggested power supply make it far easier to integrate.

The data shows distinct application domains. The MI308X is a compute accelerator with no graphics outputs and no API support, suited for HPC and AI workloads where memory capacity and bandwidth dominate. The RTX PRO 4000 is a workstation graphics card with full API support, display outputs, and verified benchmark performance, suited for professional visualization and rendering tasks.

The transistor density difference is notable: the MI308X achieves 150.4 million transistors per square millimeter versus 120.6 million for the RTX PRO 4000. This higher density reflects the MI308X's more complex compute-focused design. The RTX PRO 4000's smaller die and lower transistor count align with its more balanced graphics and compute architecture.

In benchmark performance, the RTX PRO 4000 sits within 1.6 percent of the RTX 3090 and within 1.1 percent of the RX 6700 XT, placing it in a well-established performance tier. The MI308X has no benchmark data, so its performance relative to any GPU cannot be assessed from the database. Users with graphics workloads should rely on the RTX PRO 4000's measured scores. Users with massive memory requirements may look to the MI308X, but without benchmark verification.