AMD Instinct MI355X vs NVIDIA RTX PRO 6000 Blackwell Server Comparison

FAQ

Q: What are the core architectural identities of the AMD Instinct MI355X and the NVIDIA RTX PRO 6000 Blackwell Server?

A: The AMD Instinct MI355X uses the CDNA 4.0 architecture on the MI350 256CU chip, built on a 3 nm process at TSMC. The NVIDIA RTX PRO 6000 Blackwell Server uses the Blackwell 2.0 architecture on the GB202 chip, built on a 5 nm process at TSMC.

Q: How do the memory subsystems compare between the two cards?

A: The AMD Instinct MI355X features 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The NVIDIA RTX PRO 6000 Blackwell Server features 96 GB of GDDR7 memory on a 512-bit bus, delivering 1.79 TB/s of bandwidth.

Q: What is the difference in raw FP32 compute throughput?

A: The NVIDIA RTX PRO 6000 Blackwell Server delivers 126.0 TFLOPS FP32, while the AMD Instinct MI355X delivers 78.64 TFLOPS FP32. Both cards also deliver the same FP16 throughput as their FP32 figures, with a 1:1 ratio.

Q: Which card has a higher transistor count and die size?

A: The AMD Instinct MI355X has 185,000 million transistors on a 2380 mm² die, resulting in a transistor density of 77.7M per mm². The NVIDIA RTX PRO 6000 Blackwell Server has 92,200 million transistors on a 750 mm² die, resulting in a transistor density of 122.9M per mm².

Q: What are the thermal design power (TDP) requirements for each card?

A: The AMD Instinct MI355X has a TDP of 1400 W with a suggested PSU of 1800 W. The NVIDIA RTX PRO 6000 Blackwell Server has a TDP of 600 W with a suggested PSU of 1000 W.

Q: What benchmark data is available for the NVIDIA RTX PRO 6000 Blackwell Server?

A: The database records one benchmark result for the NVIDIA card: a 3DMark Steel Nomad DX12 score of 5996. The AMD Instinct MI355X has no recorded benchmark scores in the database, and its average benchmark score is 0.

Architecture Differences

The AMD Instinct MI355X and the NVIDIA RTX PRO 6000 Blackwell Server represent two fundamentally different design philosophies within the accelerator space. The AMD part is built on the CDNA 4.0 architecture, which is a dedicated compute-optimized design, while the NVIDIA part uses the Blackwell 2.0 architecture, which carries forward a full graphics and compute feature set.

The manufacturing processes diverge significantly. The AMD Instinct MI355X is fabricated on a 3 nm process at TSMC, while the NVIDIA RTX PRO 6000 Blackwell Server uses a 5 nm process at the same foundry. This process difference contributes to the AMD chip's larger physical footprint: the MI350 256CU die measures 2380 mm², whereas the GB202 die measures 750 mm². The transistor counts reflect this disparity, with the AMD chip housing 185,000 million transistors compared to 92,200 million on the NVIDIA chip. However, the NVIDIA chip achieves a higher transistor density of 122.9M per mm² versus 77.7M per mm² for the AMD chip.

The memory architectures are entirely different. The AMD Instinct MI355X uses 288 GB of HBM3e memory with an 8192-bit bus width, a configuration aimed at massive bandwidth for large datasets. The NVIDIA RTX PRO 6000 Blackwell Server uses 96 GB of GDDR7 memory with a 512-bit bus, a more conventional approach for a dual-slot card. The bandwidth figures underscore this: 8.19 TB/s for the AMD card versus 1.79 TB/s for the NVIDIA card.

The compute resource allocation also differs. The AMD Instinct MI355X has 16,384 shading units, 1,024 TMUs, and 0 ROPs, reflecting its lack of a rasterization pipeline. Its texture rate is 2,457.6 GTexel/s, and its pixel rate is 0 MPixel/s. The NVIDIA RTX PRO 6000 Blackwell Server has 24,064 shading units, 752 TMUs, and 192 ROPs, along with 188 ray tracing cores and 752 tensor cores. Its texture rate is 1,968.0 GTexel/s, and its pixel rate is 502.5 GPixel/s.

Features diverge sharply. The NVIDIA card supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and it provides 4x DisplayPort 2.1b outputs. The AMD card has no display outputs and lists its API support as N/A across DirectX, OpenGL, and Vulkan. The NVIDIA card also includes ray tracing and tensor core hardware, while the AMD card has no such cores listed.

Physical specifications differ as well. The AMD Instinct MI355X is an OAM module with dimensions of 102 mm by 165 mm, while the NVIDIA RTX PRO 6000 Blackwell Server is a dual-slot card measuring 267 mm by 111 mm by 40 mm. The NVIDIA card uses a single 16-pin power connector, while the AMD card has no power connectors listed, relying on the OAM module interface.

Head-to-Head Benchmarks

The recorded data provides a clear but limited picture of comparative performance. The AMD Instinct MI355X has no benchmark scores in the database, with an average benchmark score of 0 and a percentile rank of 50 against all GPUs. The NVIDIA RTX PRO 6000 Blackwell Server has a single recorded benchmark: a 3DMark Steel Nomad DX12 score of 5996, placing it at the 34th percentile against all GPUs.

In the absence of direct head-to-head results, the nearest rivals for the NVIDIA card offer context. The NVIDIA GeForce GTX 770M scores 6000, which is 0.1% higher than the RTX PRO 6000 Blackwell Server. The AMD Radeon RX 6400 also scores 6001, 0.1% higher. On the lower side, the AMD FirePro W4100 scores 5987, 0.2% lower, and the NVIDIA Quadro K4000M scores 5986, 0.2% lower. These deltas are marginal, indicating that the RTX PRO 6000 Blackwell Server's single benchmark result sits in a narrow band around the 6000-point mark.

The FP32 compute figures provide another comparative angle. The NVIDIA RTX PRO 6000 Blackwell Server delivers 126.0 TFLOPS, which is 60.1% higher than the AMD Instinct MI355X's 78.64 TFLOPS. This is a substantial advantage for the NVIDIA card in raw compute throughput, though the AMD card's memory bandwidth of 8.19 TB/s is 4.6 times higher than the NVIDIA card's 1.79 TB/s, suggesting different workload suitability.

The wins tally in the database shows 0 wins for the AMD card and 0 wins for the NVIDIA card in head-to-head benchmarks, confirming that no direct comparative tests have been recorded.

The Verdict

The data indicates that these two cards serve different primary purposes, despite both being server-oriented accelerators. The AMD Instinct MI355X is positioned for memory-bandwidth-intensive workloads, given its 288 GB HBM3e capacity and 8.19 TB/s bandwidth. The NVIDIA RTX PRO 6000 Blackwell Server is positioned for compute-heavy tasks requiring high FP32 throughput and full graphics API support, delivering 126.0 TFLOPS.

For users prioritizing raw FP32 compute, the NVIDIA card is the clear choice based on the recorded data, with a 47.36 TFLOPS advantage over the AMD part. For users prioritizing memory capacity and bandwidth, the AMD card offers 192 GB more memory and 6.4 TB/s more bandwidth. The NVIDIA card also includes ray tracing cores, tensor cores, and display outputs, making it a more versatile option for mixed workloads, while the AMD card has no such features listed.

The absence of benchmark scores for the AMD card means that real-world performance comparisons cannot be drawn from the database. The NVIDIA card's single 3DMark Steel Nomad DX12 score of 5996 is its only recorded performance data point, and its nearest rivals all fall within 0.2% of that score, indicating that this benchmark may not be representative of its broader compute capabilities.

The production status differs: the NVIDIA RTX PRO 6000 Blackwell Server is marked as Active, while the AMD Instinct MI355X has no production status recorded. The release dates also differ, with the NVIDIA card released on 2025-03-17 and the AMD card on 2025-06-11.

Specification Differences

The following fields differ between the AMD Instinct MI355X and the NVIDIA RTX PRO 6000 Blackwell Server:

• Manufacturer: AMD versus NVIDIA
• Chip: MI350 256CU versus GB202
• Architecture: CDNA 4.0 versus Blackwell 2.0
• Generation: Instinct (MIx) versus Server Blackwell (Bxx)
• Process Node: 3 nm versus 5 nm
• Transistors: 185,000 million versus 92,200 million
• Die Size: 2380 mm² versus 750 mm²
• Transistor Density: 77.7M / mm² versus 122.9M / mm²
• Base Clock: 1000 MHz versus 1590 MHz
• Boost Clock: 2400 MHz versus 2617 MHz
• Memory Clock: 2000 MHz 8 Gbps effective versus 1750 MHz 28 Gbps effective
• Memory Size: 288 GB versus 96 GB
• Memory Type: HBM3e versus GDDR7
• Memory Bus Width: 8192 bit versus 512 bit
• Memory Bandwidth: 8.19 TB/s versus 1.79 TB/s
• Shading Units: 16,384 versus 24,064
• TMUs: 1,024 versus 752
• ROPs: 0 versus 192
• RT Cores: null versus 188
• Tensor Cores: null versus 752
• Pixel Rate: 0 MPixel/s versus 502.5 GPixel/s
• Texture Rate: 2,457.6 GTexel/s versus 1,968.0 GTexel/s
• FP32 Compute: 78.64 TFLOPS versus 126.0 TFLOPS
• FP16 Compute: 78.64 TFLOPS (1:1) versus 126.0 TFLOPS (1:1)
• TDP: 1400 W versus 600 W
• Slot Width: OAM Module versus Dual-slot
• Power Connectors: None versus 1x 16-pin
• Suggested PSU: 1800 W versus 1000 W
• Display Outputs: No outputs versus 4x DisplayPort 2.1b
• DirectX Support: N/A versus 12 Ultimate (12_2)
• OpenGL Support: N/A versus 4.6
• Vulkan Support: N/A versus 1.4
• Dimensions: 102 mm x 165 mm versus 267 mm x 111 mm x 40 mm
• Production Status: null versus Active
• Release Date: 2025-06-11 versus 2025-03-17
• Predecessor: Radeon Instinct versus Server Hopper
• Successor: null versus Server Rubin
• Benchmark Scores: none versus 5996 (3DMark Steel Nomad DX12)
• Percentile vs All GPUs: 50 versus 34
• Average Benchmark Score: 0 versus 5996