AMD Instinct MI300 vs NVIDIA B200 SXM6 Comparison

AMD Instinct MI300 and NVIDIA B200 SXM6 are both high-end server accelerators, yet the recorded data shows they are built on fundamentally different design philosophies. The MI300, released in early 2023, is a CDNA 3.0 part with a massive 128 GB HBM3 memory pool, while the B200 SXM6, launched in late 2024, is a Blackwell architecture part with 180 GB of HBM3e and a much higher thermal envelope. Despite the lack of direct benchmark scores in the database, the specification differences and the physical design choices provide a clear picture of where each accelerator is positioned.

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either the AMD Instinct MI300 or the NVIDIA B200 SXM6. Both entries show zero benchmark entries, an average benchmark score of 0, and a percentile versus all GPUs of 50. This means there are no direct performance measurements to compare, no wins for either side, and no nearest rivals listed. The absence of data is itself informative: it indicates that these are server-grade accelerators not typically subjected to the same consumer benchmark suites, and the database has not yet captured any standardized test results for them.

Without benchmark numbers, the only quantitative comparison available comes from the raw compute specifications. The B200 SXM6 delivers 69.34 TFLOPS of FP32 and FP16 (1:1) performance, while the MI300 provides 47.87 TFLOPS in both FP32 and FP16 (1:1). That is a difference of 21.47 TFLOPS in favor of the B200, representing a 44.8% higher peak compute throughput. The B200 also has more shading units, with 18,944 versus the MI300's 14,080, a difference of 4,864 units. However, the MI300 has more texture mapping units, 880 versus 592, which gives it a texture rate of 1,496.0 GTexel/s compared to the B200's 1,083.4 GTexel/s. The B200 has 24 ROPs and a pixel rate of 43.92 GPixel/s, while the MI300 has 0 ROPs and a pixel rate of 0 MPixel/s, confirming the MI300 is not designed for rasterized graphics output.

Memory bandwidth is another clear differentiator. The B200 SXM6 accesses 8.19 TB/s of bandwidth across its 8192-bit bus, while the MI300 reaches 5.32 TB/s on the same 8192-bit bus width. The B200’s memory clock is 2000 MHz with 8 Gbps effective speed, whereas the MI300 runs at 1300 MHz with 5.2 Gbps effective. The B200 also holds more memory, 180 GB versus 128 GB, a 52 GB advantage. These numbers indicate that in memory-bound workloads, the B200 should have a substantial edge, but without actual benchmark results, the database does not confirm real-world scaling.

Architecture Differences

The two accelerators come from different architectural lineages. The AMD Instinct MI300 uses the CDNA 3.0 architecture, built on the Aqua Vanjaram chip, and belongs to the Instinct (MIx) generation. The NVIDIA B200 SXM6 uses the Blackwell architecture, built on the GB100 chip, and belongs to the Server Blackwell (Bxx) generation. Both are manufactured on a 5 nm process at TSMC, but the transistor counts diverge significantly: the MI300 has 153,000 million transistors on a 1017 mm² die, giving a transistor density of 150.4M per mm². The B200 has 208,000 million transistors on a 1628 mm² die, with a density of 127.8M per mm². The B200’s die is 611 mm² larger, and it has 55,000 million more transistors, but the MI300 packs more transistors per square millimeter.

Clock behavior also differs. The MI300 has a base clock of 1000 MHz and a boost clock of 1700 MHz. The B200 has a base clock of 120 MHz and a boost clock of 1830 MHz. The B200’s boost clock is 130 MHz higher, but its base clock is dramatically lower, which suggests a more aggressive power management strategy. The B200 also carries a TDP of 1000 W and a suggested PSU of 1400 W, while the MI300 has a TDP of 600 W and a suggested PSU of 1000 W. The B200 is an SXM module, meaning it is designed for a board-level socket rather than a PCIe slot, whereas the MI300 uses a PCIe 5.0 x16 interface. Interestingly, the B200 uses PCIe 6.0 x16, a newer bus standard. Power connectors are listed as 2x 8-pin for the MI300 and null for the B200, reflecting the SXM form factor’s different power delivery.

Memory technology is another major split. The MI300 uses HBM3 with a 128 GB capacity, while the B200 uses HBM3e with 180 GB. Both have an 8192-bit bus, but the B200’s HBM3e achieves higher effective speeds, 8 Gbps versus 5.2 Gbps, resulting in the 8.19 TB/s bandwidth figure. The MI300 has no tensor cores listed, while the B200 has 592 tensor cores. The MI300 also has no ray tracing cores, and neither part has any display outputs or API support for DirectX, OpenGL, or Vulkan, confirming their compute-only purpose.

FAQ

Q: What is the peak FP32 performance of each accelerator?

A: The AMD Instinct MI300 delivers 47.87 TFLOPS of FP32, while the NVIDIA B200 SXM6 delivers 69.34 TFLOPS of FP32. The B200 is therefore 21.47 TFLOPS higher in this metric.

Q: How much memory and bandwidth does each part have?

A: The MI300 has 128 GB of HBM3 with 5.32 TB/s bandwidth. The B200 has 180 GB of HBM3e with 8.19 TB/s bandwidth. The B200 offers 52 GB more capacity and 2.87 TB/s more bandwidth.

Q: Are these GPUs capable of graphics output?

A: No. Both list "No outputs" for display connections, and both have N/A for DirectX, OpenGL, and Vulkan APIs. The MI300 has 0 ROPs and a pixel rate of 0 MPixel/s, while the B200 has 24 ROPs and a pixel rate of 43.92 GPixel/s, but this does not translate to display capability.

Q: What is the difference in transistor count and die size?

A: The MI300 has 153,000 million transistors on a 1017 mm² die. The B200 has 208,000 million transistors on a 1628 mm² die. The B200 has 55,000 million more transistors and a 611 mm² larger die.

Q: Which part has a higher boost clock?

A: The B200 has a boost clock of 1830 MHz, which is 130 MHz higher than the MI300’s 1700 MHz boost clock. However, the MI300’s base clock is 1000 MHz, far higher than the B200’s 120 MHz base clock.

Q: What is the release timeline for these accelerators?

A: The MI300 was released on 2023-01-03, while the B200 was released on 2024-10-31. The B200’s production status is listed as Active, and its successor is Server Rubin, while the MI300’s predecessor is Radeon Instinct.

The Verdict

The data indicates that the NVIDIA B200 SXM6 is the more powerful part on paper. It leads in FP32 and FP16 compute, shading units, tensor cores, memory capacity, memory bandwidth, and boost clock. Its 69.34 TFLOPS of FP32 is 44.8% higher than the MI300’s 47.87 TFLOPS. The B200 also has 4,864 more shading units and 592 tensor cores, where the MI300 lists none. The B200’s 8.19 TB/s memory bandwidth is 2.87 TB/s higher, and its 180 GB capacity is 52 GB larger. These factors point to the B200 being the stronger choice for compute-heavy inference and training workloads that exploit FP16 or tensor operations and require large memory footprints.

The AMD Instinct MI300, however, offers advantages in specific areas. It has a higher transistor density, 150.4M per mm² versus 127.8M per mm², which can indicate efficient design. It also has more TMUs, 880 versus 592, and a higher texture rate, 1,496.0 GTexel/s versus 1,083.4 GTexel/s. Its base clock of 1000 MHz is substantially higher than the B200’s 120 MHz, which may benefit sustained, lower-intensity tasks. The MI300 also has a lower TDP, 600 W versus 1000 W, and a lower suggested PSU, 1000 W versus 1400 W, which could matter for system integration density.

The B200’s launch MSRP is 34,999 USD, though the database does not provide a similar figure for the MI300. The B200 is also an SXM module with PCIe 6.0 x16, while the MI300 uses PCIe 5.0 x16 and a 2x 8-pin power connector. These form factor differences affect how each is deployed in a server chassis.

Specification Differences

The following fields differ between the two parts:

• Architecture: CDNA 3.0 versus Blackwell
• Chip: Aqua Vanjaram versus GB100
• Generation: Instinct (MIx) versus Server Blackwell (Bxx)
• Transistors: 153,000 million versus 208,000 million
• Die size: 1017 mm² versus 1628 mm²
• Transistor density: 150.4M / mm² versus 127.8M / mm²
• Base clock: 1000 MHz versus 120 MHz
• Boost clock: 1700 MHz versus 1830 MHz
• Memory clock: 1300 MHz 5.2 Gbps effective versus 2000 MHz 8 Gbps effective
• Memory size: 128 GB versus 180 GB
• Memory type: HBM3 versus HBM3e
• Memory bandwidth: 5.32 TB/s versus 8.19 TB/s
• Shading units: 14,080 versus 18,944
• TMUs: 880 versus 592
• ROPs: 0 versus 24
• Tensor cores: null versus 592
• Pixel rate: 0 MPixel/s versus 43.92 GPixel/s
• Texture rate: 1,496.0 GTexel/s versus 1,083.4 GTexel/s
• FP32: 47.87 TFLOPS versus 69.34 TFLOPS
• FP16: 47.87 TFLOPS (1:1) versus 69.34 TFLOPS (1:1)
• TDP: 600 W versus 1000 W
• Slot width: null versus SXM Module
• Power connectors: 2x 8-pin versus null
• Suggested PSU: 1000 W versus 1400 W
• Bus interface: PCIe 5.0 x16 versus PCIe 6.0 x16
• Dimensions: 267 mm length, 111 mm height versus null
• Production status: null versus Active
• Release date: 2023-01-03 versus 2024-10-31
• Predecessor: Radeon Instinct versus Server Hopper
• Successor: null versus Server Rubin
• Launch MSRP: null versus 34,999 USD

Where Each One Wins

The NVIDIA B200 SXM6 wins in raw compute throughput. Its 69.34 TFLOPS FP32 and FP16 figures are the highest in this comparison, and its 592 tensor cores provide a dedicated path for matrix operations. The 8.19 TB/s memory bandwidth and 180 GB capacity give it a clear advantage in workloads that move large datasets, such as training large language models or processing high-resolution multi-dimensional tensors. The higher boost clock of 1830 MHz and the newer PCIe 6.0 x16 interface also support sustained high-throughput operations. The B200’s 24 ROPs and 43.92 GPixel/s pixel rate, while not for display, indicate some rasterization capability.

The AMD Instinct MI300 wins in efficiency-oriented metrics. Its 600 W TDP and 1000 W suggested PSU are lower than the B200’s 1000 W and 1400 W, respectively, which could allow more accelerators per server within a power budget. The higher transistor density of 150.4M per mm² suggests a more compact design. The MI300’s 880 TMUs and 1,496.0 GTexel/s texture rate exceed the B200’s figures, which may benefit texture-heavy compute pipelines. The base clock of 1000 MHz versus 120 MHz indicates the MI300 can sustain a higher minimum operating frequency. The 128 GB of HBM3 is still substantial, and the 5.32 TB/s bandwidth is not trivial. For deployments prioritizing lower power draw and dense packing, the MI300 holds the advantage. The database does not provide benchmark scores to confirm these theoretical wins in practice, so these conclusions rest on the recorded specifications alone.