AMD Instinct MI300X vs NVIDIA RTX PRO 6000 Blackwell Comparison

The Verdict

The recorded data presents two accelerators built for fundamentally different workloads, despite both targeting professional and data center environments. The AMD Instinct MI300X is a pure compute accelerator with no display outputs and no graphics API support, while the NVIDIA RTX PRO 6000 Blackwell is a full workstation GPU with DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4, and four DisplayPort 2.1b outputs.

Benchmark results show the MI300X achieves a Geekbench OpenCL score of 317,994 and sits at the 100th percentile among all GPUs in the database. The RTX PRO 6000 Blackwell records a 3DMark Steel Nomad DX12 score of 16,408 and lands at the 59th percentile. These tests measure different capabilities, so direct numerical comparison is not meaningful. The MI300X is positioned as a high-density compute module for AI and HPC workloads. The RTX PRO 6000 Blackwell serves as a dual-slot workstation card for graphics, rendering, and professional visualization tasks that require display output and graphics API compatibility.

The MI300X has no launch MSRP recorded. The RTX PRO 6000 Blackwell has a launch MSRP of 8,565 USD.

Architecture Differences

The MI300X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, manufactured on a 5 nm process at TSMC. The die contains 153,000 million transistors across a 1017 mm² area, yielding a transistor density of 150.4M per mm². The RTX PRO 6000 Blackwell uses the GB202 chip on Blackwell 2.0 architecture, also manufactured on a 5 nm TSMC process. Its die contains 92,200 million transistors across 750 mm², with a density of 122.9M per mm².

The MI300X carries 192 GB of HBM3 memory on an 8192-bit bus, delivering 5.32 TB/s of bandwidth. The RTX PRO 6000 Blackwell features 96 GB of GDDR7 memory on a 512-bit bus, providing 1.79 TB/s. Memory clock rates differ substantially: the MI300X memory runs at 1300 MHz with 5.2 Gbps effective, while the RTX PRO 6000 Blackwell memory runs at 1750 MHz with 28 Gbps effective.

Shader resources favor the NVIDIA card in raw count. The RTX PRO 6000 Blackwell has 24,064 shading units, 752 texture mapping units, and 192 ROPs. The MI300X has 19,456 shading units and 1,216 TMUs but reports zero ROPs and a pixel rate of 0 MPixel/s, consistent with its lack of display outputs. The RTX PRO 6000 Blackwell includes 188 RT cores and 752 tensor cores, delivering 502.5 GPixel/s pixel fill rate and 1,968.0 GTexel/s texture rate. The MI300X has no RT or tensor core counts listed and produces a texture rate of 2,553.6 GTexel/s.

Clock speeds favor NVIDIA. The RTX PRO 6000 Blackwell runs at a 1590 MHz base and 2617 MHz boost. The MI300X runs at 1000 MHz base and 2100 MHz boost. Floating-point throughput diverges: the MI300X delivers 81.72 TFLOPS FP32 and the same 81.72 TFLOPS FP16 at a 1:1 ratio. The RTX PRO 6000 Blackwell delivers 126.0 TFLOPS FP32 and 126.0 TFLOPS FP16 at a 1:1 ratio.

Power and physical design differ sharply. The MI300X is an OAM module with no power connectors, a 750 W TDP, and a suggested PSU of 1150 W. The RTX PRO 6000 Blackwell is a dual-slot card with one 16-pin power connector, a 600 W TDP, and a suggested PSU of 1000 W. Its dimensions measure 304 mm in length, 137 mm in height, and 40 mm in width. Both use PCIe 5.0 x16 interfaces.

The MI300X supports no graphics APIs, listing DirectX, OpenGL, and Vulkan as N/A. The RTX PRO 6000 Blackwell supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Release dates place the MI300X on 2023-12-05 and the RTX PRO 6000 Blackwell on 2025-03-17. The MI300X predecessor is Radeon Instinct, while the RTX PRO 6000 Blackwell predecessor is Workstation Ada. The RTX PRO 6000 Blackwell production status is Active.

Head-to-Head Benchmarks

No direct head-to-head benchmark results exist between these two products in the database. The recorded wins for each product are zero. Instead, comparison must rely on their respective nearest rivals and the distinct benchmark suites used for each.

The MI300X Geekbench OpenCL score of 317,994 trails the NVIDIA H200 NVL average score of 334,891 by 5% and the NVIDIA B200 average score of 345,482 by 8%. It leads the NVIDIA L40S average score of 295,763 by 7.5% and the NVIDIA RTX 6000 Ada Generation average score of 287,237 by 10.7%. These deltas position the MI300X in the upper tier of compute accelerators, ahead of the previous-generation workstation-class Ada card by over a tenth while remaining slightly behind the newest H200 and B200 accelerators.

The RTX PRO 6000 Blackwell 3DMark Steel Nomad DX12 score of 16,408 sits within a narrow band of rivals. It matches the AMD Radeon PRO W7500 average score of 16,415 with a 0% delta. It leads the AMD Radeon RX 5700 XT average score of 16,361 by 0.3% and the AMD Radeon Pro 5600M average score of 16,351 by 0.4%. It trails the NVIDIA GeForce RTX 5090 D V2 average score of 16,504 by 0.6%. This cluster indicates the Steel Nomad DX12 test compresses performance differences heavily at this level, with all four rivals within a 0.9% spread.

The MI300X 100th percentile ranking across all GPUs reflects the Geekbench OpenCL test, where its 317,994 score outranks every other recorded GPU. The RTX PRO 6000 Blackwell 59th percentile reflects the Steel Nomad DX12 test, a graphics-centric workload that the pure-compute MI300X cannot run due to its absence of graphics API support.

FAQ

Q: Which product has more memory bandwidth?

A: The MI300X delivers 5.32 TB/s from 192 GB of HBM3 on an 8192-bit bus. The RTX PRO 6000 Blackwell delivers 1.79 TB/s from 96 GB of GDDR7 on a 512-bit bus. The MI300X bandwidth is roughly three times higher.

Q: Can the MI300X drive displays?

A: No. The MI300X lists no display outputs and a pixel rate of 0 MPixel/s. The RTX PRO 6000 Blackwell has four DisplayPort 2.1b outputs and a pixel rate of 502.5 GPixel/s.

Q: How does the MI300X compare to the NVIDIA H200 NVL?

A: The MI300X Geekbench OpenCL score of 317,994 is 5% below the H200 NVL average score of 334,891.

Q: What graphics APIs does the RTX PRO 6000 Blackwell support?

A: It supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300X lists all three APIs as N/A.

Q: Which card has higher FP32 throughput?

A: The RTX PRO 6000 Blackwell delivers 126.0 TFLOPS FP32, compared to 81.72 TFLOPS for the MI300X. The NVIDIA card also delivers 126.0 TFLOPS FP16, while the MI300X delivers 81.72 TFLOPS FP16.

Q: How does the RTX PRO 6000 Blackwell compare to the GeForce RTX 5090 D V2?

A: The RTX PRO 6000 Blackwell Steel Nomad DX12 score of 16,408 is 0.6% below the RTX 5090 D V2 average score of 16,504.

Where Each One Wins

The MI300X wins in memory capacity and bandwidth. Its 192 GB of HBM3 with 5.32 TB/s bandwidth dwarfs the 96 GB GDDR7 with 1.79 TB/s on the RTX PRO 6000 Blackwell. For workloads that load large models or datasets into memory, the MI300X provides over double the capacity and roughly triple the bandwidth. Its 8192-bit bus width reflects a design optimized for sustained memory throughput rather than rasterization.

The MI300X also wins on texture rate, posting 2,553.6 GTexel/s against 1,968.0 GTexel/s for the RTX PRO 6000 Blackwell, despite having fewer shading units. Its 1,216 TMUs outnumber the NVIDIA card's 752 TMUs. The MI300X transistor count of 153,000 million on a 1017 mm² die exceeds the NVIDIA chip's 92,200 million on 750 mm².

The RTX PRO 6000 Blackwell wins in raw shader throughput. Its 126.0 TFLOPS FP32 and FP16 figures exceed the MI300X 81.72 TFLOPS in both precisions. Its 24,064 shading units outnumber the MI300X 19,456. The NVIDIA card also has 192 ROPs and 188 RT cores, while the MI300X reports zero ROPs, zero pixel rate, and no RT core count.

The RTX PRO 6000 Blackwell wins on clock speeds and graphics features. Its 1590 MHz base and 2617 MHz boost exceed the MI300X 1000 MHz base and 2100 MHz boost. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI300X supports none. Display connectivity favors NVIDIA exclusively, with four DisplayPort 2.1b outputs versus none.

Power requirements favor the RTX PRO 6000 Blackwell. Its 600 W TDP and 1000 W suggested PSU are lower than the MI300X 750 W TDP and 1150 W suggested PSU. The NVIDIA card fits in a dual-slot form factor with a single 16-pin connector, while the MI300X uses an OAM module with no power connectors, requiring a different mounting and power infrastructure.

The MI300X has a higher transistor density at 150.4M per mm² versus 122.9M per mm² for the RTX PRO 6000 Blackwell. Both share the same 5 nm TSMC process and PCIe 5.0 x16 bus interface.

Use-case separation follows the architectural data. The MI300X targets memory-bound compute workloads where 192 GB capacity, 5.32 TB/s bandwidth, and 100th percentile Geekbench OpenCL performance matter more than graphics output. The RTX PRO 6000 Blackwell targets graphics-bound professional workloads where 126.0 TFLOPS FP32, 502.5 GPixel/s fill rate, RT cores, and display outputs are required. The MI300X launched 2023-12-05 with no recorded MSRP. The RTX PRO 6000 Blackwell launched 2025-03-17 with a launch MSRP of 8,565 USD and remains in Active production status.