AMD Instinct MI300 vs NVIDIA RTX PRO 5000 Blackwell Comparison

Where Each One Wins

The AMD Instinct MI300 and NVIDIA RTX PRO 5000 Blackwell occupy different corners of the accelerator market, and the recorded data reflects that split clearly. The MI300 is a compute-oriented device with no display outputs, no graphics API support, and a texture rate of 1,496.0 GTexel/s against the NVIDIA part's 1,045.9 GTexel/s. That texture throughput advantage, combined with 880 texture mapping units versus 440, gives the AMD part a decisive edge in workloads that hammer texture fetch and filtering operations. The pixel rate tells the opposite story: the MI300 records 0 MPixel/s, while the RTX PRO 5000 Blackwell delivers 380.3 GPixel/s. Any workload that involves rasterization, pixel shading, or framebuffer writes belongs squarely to the NVIDIA part.

The FP32 compute comparison is also lopsided, but in NVIDIA's favor. The RTX PRO 5000 Blackwell achieves 66.94 TFLOPS of FP32 throughput, while the MI300 manages 47.87 TFLOPS. Both parts list FP16 at a 1:1 ratio with FP32, so the same proportional gap carries over to half-precision work. The NVIDIA card also brings dedicated ray tracing cores (110 of them) and 440 tensor cores, features the MI300 does not expose in the database. For rendering, ray tracing, and tensor-accelerated workloads, the NVIDIA card is the only one of the two with the relevant hardware.

Memory capacity and bandwidth favor AMD overwhelmingly. The MI300 ships with 128 GB of HBM3 across an 8192-bit bus, yielding 5.32 TB/s of bandwidth. The RTX PRO 5000 Blackwell uses 48 GB of GDDR7 on a 384-bit bus for 1.34 TB/s. That is a 4 TB/s bandwidth gap, which matters for large model inference, scientific computing, and any dataset that exceeds the NVIDIA card's 48 GB frame buffer. The MI300 also carries a transistor count of 153,000 million on a 1017 mm² die, versus 92,200 million on 750 mm² for NVIDIA, indicating a much larger physical device built for throughput density rather than efficiency.

Power and physical design separate the two further. The MI300 draws a 600 W TDP and requires a 1000 W suggested PSU with two 8-pin connectors. The RTX PRO 5000 Blackwell runs at 300 W TDP with a 700 W suggested PSU and a single 16-pin connector. The AMD card is dual-slot in practice based on its 267 mm by 111 mm footprint, though the database lists no explicit slot width. NVIDIA specifies a dual-slot 40 mm wide card with four DisplayPort 2.1b outputs. The MI300 has no display outputs at all.

Architecture Differences

The two accelerators come from different architectural lineages. AMD uses the CDNA 3.0 architecture on a chip called Aqua Vanjaram, part of the Instinct (MIx) generation. NVIDIA uses Blackwell 2.0 on the GB202 chip, part of the Blackwell PRO W (x000) generation. Both are fabricated by TSMC on a 5 nm process, but the physical implementations diverge sharply. AMD's die measures 1017 mm² with 153,000 million transistors, producing a transistor density of 150.4M per mm². NVIDIA's die is 750 mm² with 92,200 million transistors, a density of 122.9M per mm². AMD packs more transistors into a larger area, while NVIDIA runs higher clocks: 1740 MHz base and 2377 MHz boost on the RTX PRO 5000 Blackwell versus 1000 MHz base and 1700 MHz boost on the MI300.

Memory architecture is a fundamental differentiator. The MI300 uses 128 GB of HBM3 on an 8192-bit bus with a 5.32 TB/s bandwidth and a memory clock of 1300 MHz (5.2 Gbps effective). The RTX PRO 5000 Blackwell uses 48 GB of GDDR7 on a 384-bit bus with 1.34 TB/s bandwidth and a 1750 MHz memory clock (28 Gbps effective). The MI300's bus width is more than 21 times wider, which explains its massive bandwidth advantage despite the much lower memory clock speed.

Shader and fixed-function resources also differ. Both parts list 14,080 shading units, but the similarity ends there. The MI300 has 880 texture mapping units and no ROPs, no RT cores, and no tensor cores listed. The RTX PRO 5000 Blackwell has 440 TMUs, 160 ROPs, 110 RT cores, and 440 tensor cores. The MI300's texture rate of 1,496.0 GTexel/s exceeds the NVIDIA card's 1,045.9 GTexel/s, but the NVIDIA card's pixel rate of 380.3 GPixel/s is unmatched by the MI300's 0 MPixel/s. The MI300 supports no DirectX, OpenGL, or Vulkan APIs, while the NVIDIA card supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The NVIDIA card also has four DisplayPort 2.1b outputs; the MI300 has none.

Power delivery and cooling requirements reflect the architectural choices. The MI300 is a 600 W part with a 1000 W suggested PSU and two 8-pin connectors. The RTX PRO 5000 Blackwell is a 300 W part with a 700 W suggested PSU and a single 16-pin connector. The NVIDIA card is explicitly dual-slot with 40 mm width; the MI300's width is not recorded, but its 267 mm length and 111 mm height match the NVIDIA card exactly. The release dates are far apart: the MI300 launched on 2023-01-03, while the RTX PRO 5000 Blackwell arrived on 2025-03-17. The MI300's predecessor is Radeon Instinct, and NVIDIA's predecessor is Workstation Ada, indicating different product lineage trajectories.

The Verdict

The data indicates two specialized tools rather than direct competitors. The MI300 wins on memory capacity, memory bandwidth, texture throughput, and transistor count. It offers 128 GB of HBM3, 5.32 TB/s of bandwidth, and 1,496.0 GTexel/s of texture rate. Those specifications target large-scale compute workloads, model training, and scientific simulation where dataset size and memory bandwidth dominate. The absence of display outputs, graphics APIs, and pixel rendering hardware confirms that the MI300 is not intended for any graphics output role.

The RTX PRO 5000 Blackwell wins on FP32 compute, pixel rate, clocks, graphics API support, ray tracing, tensor cores, and power efficiency. It delivers 66.94 TFLOPS of FP32, 380.3 GPixel/s, a 2377 MHz boost clock, DirectX 12 Ultimate support, 110 RT cores, 440 tensor cores, and a 300 W TDP. Its 48 GB of GDDR7 memory and 1.34 TB/s bandwidth are smaller than the MI300's, but the NVIDIA card is the only one of the two that can drive displays, run graphics workloads, or accelerate ray-traced rendering.

The benchmark data available for the NVIDIA card reinforces its position. It records a 98th percentile score against all GPUs in the database, with an average benchmark score of 182,109. Its nearest rivals include the NVIDIA A100 SXM4 80 GB (183,725 average score, 0.9% higher), the NVIDIA RTX 5000 Ada Generation (184,664, 1.4% higher), the NVIDIA GeForce RTX 4090 D (178,050, 2.3% lower), and the NVIDIA A100 SXM4 40 GB (187,147, 2.7% higher). These deltas show the RTX PRO 5000 Blackwell sits within a few percent of other high-end NVIDIA accelerators in aggregate benchmark scoring. The MI300 has no benchmark scores, no percentile ranking beyond 50th, and no nearest rivals recorded, which limits direct performance comparison but also reflects its different positioning.

For workloads that fit within 48 GB and require graphics, ray tracing, or general FP32 compute, the RTX PRO 5000 Blackwell is the functional choice. For workloads that need more than 48 GB of memory or maximum memory bandwidth, the MI300's 128 GB and 5.32 TB/s are unmatched by the NVIDIA card. The power draw difference of 300 W versus 600 W also matters for deployment density, but the MI300's larger memory footprint justifies its higher power envelope in memory-bound scenarios.

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI300 has 5.32 TB/s of bandwidth from 128 GB of HBM3 on an 8192-bit bus. The NVIDIA RTX PRO 5000 Blackwell has 1.34 TB/s from 48 GB of GDDR7 on a 384-bit bus.

Q: Does the AMD Instinct MI300 support display outputs?

A: No. The MI300 lists no display outputs, while the NVIDIA RTX PRO 5000 Blackwell has 4x DisplayPort 2.1b.

Q: Which card has higher FP32 compute throughput?

A: The NVIDIA RTX PRO 5000 Blackwell achieves 66.94 TFLOPS of FP32, compared to 47.87 TFLOPS for the AMD Instinct MI300. Both list FP16 at a 1:1 ratio with FP32.

Q: What is the power consumption difference?

A: The MI300 has a 600 W TDP with a 1000 W suggested PSU and two 8-pin connectors. The RTX PRO 5000 Blackwell has a 300 W TDP with a 700 W suggested PSU and one 16-pin connector.

Q: Which card supports ray tracing and tensor cores?

A: Only the NVIDIA RTX PRO 5000 Blackwell lists 110 RT cores and 440 tensor cores. The AMD Instinct MI300 has no RT cores or tensor cores recorded.

Q: How does the RTX PRO 5000 Blackwell compare to its nearest rivals in benchmark scores?

A: Its average benchmark score is 182,109. The NVIDIA A100 SXM4 80 GB scores 183,725 (0.9% higher), the RTX 5000 Ada Generation scores 184,664 (1.4% higher), the GeForce RTX 4090 D scores 178,050 (2.3% lower), and the A100 SXM4 40 GB scores 187,147 (2.7% higher).

Head-to-Head Benchmarks

The database records no direct head-to-head benchmark runs between the MI300 and the RTX PRO 5000 Blackwell, and the MI300 has no individual benchmark scores at all. The RTX PRO 5000 Blackwell, however, has three recorded test results that frame its performance profile. In 3DMark Steel Nomad DX12, it scores 9,579.5. In Geekbench OpenCL, it scores 254,116. In Geekbench Vulkan, it scores 282,631. These are the only measured data points in the comparison, and they all belong to the NVIDIA part.

The absence of MI300 benchmark data means the comparison rests on specification-level analysis. The MI300's texture rate of 1,496.0 GTexel/s is 43% higher than the RTX PRO 5000 Blackwell's 1,045.9 GTexel/s, a clear win for AMD in texture-bound operations. The NVIDIA card counters with a pixel rate of 380.3 GPixel/s against the MI300's 0 MPixel/s, an absolute win in any rasterization scenario. In FP32 compute, the NVIDIA card leads by 19.07 TFLOPS, or roughly 40% over the MI300's 47.87 TFLOPS. The MI300's memory bandwidth of 5.32 TB/s is 3.98 TB/s higher than the NVIDIA card's 1.34 TB/s, a roughly 3x advantage.

Clock speeds favor NVIDIA substantially. The RTX PRO 5000 Blackwell boosts to 2377 MHz versus 1700 MHz for the MI300, a 677 MHz gap that helps explain the FP32 and pixel rate differences despite equal shading unit counts. The memory clocks also differ: NVIDIA runs at 1750 MHz (28 Gbps effective) while AMD runs at 1300 MHz (5.2 Gbps effective), but the MI300's 8192-bit bus overwhelms the clock deficit to produce far higher total bandwidth.

The RTX PRO 5000 Blackwell's nearest rival data provides context for its aggregate performance. Its average benchmark score of 182,109 places it within 2.7% of the A100 SXM4 40 GB (187,147) and 2.3% above the GeForce RTX 4090 D (178,050). The two closest competitors, the A100 SXM4 80 GB and RTX 5000 Ada Generation, beat it by less than 1.5%. This clustering suggests the RTX PRO 5000 Blackwell sits in a competitive performance band among high-end NVIDIA accelerators, despite its workstation-oriented feature set and 300 W power envelope.

The MI300's 50th percentile ranking against all GPUs, with an average benchmark score of 0 and no rival list, indicates the database lacks measured performance data for this part. Its specification sheet, however, shows a device built around memory capacity and bandwidth rather than graphics or ray tracing. The 128 GB HBM3 frame buffer is more than 2.6 times the size of the NVIDIA card's 48 GB, and the 5.32 TB/s bandwidth is nearly 4 times higher. The MI300 also uses 153,000 million transistors, 60,800 million more than the NVIDIA card, on a die that is 267 mm² larger.

The power comparison is stark: 600 W for AMD versus 300 W for NVIDIA, with suggested PSU ratings of 1000 W and 700 W respectively. The MI300 requires two 8-pin power connectors while the NVIDIA card uses a single 16-pin connector. Both cards share the same 267 mm length and 111 mm height, and both use PCIe 5.0 x16 interfaces. The NVIDIA card is explicitly dual-slot with a 40 mm width; the MI300's width is not recorded. The release gap of over two years, from 2023-01-03 to 2025-03-17, also separates the two designs chronologically.