AMD Instinct MI325X vs NVIDIA B200 SXM6 Comparison

Where Each One Wins

The recorded database contains no benchmark scores for either the AMD Instinct MI325X or the NVIDIA B200 SXM6. Both cards show an average benchmark score of zero, a percentile ranking of 50 among all GPUs, and zero wins in head-to-head comparisons. This absence of measured data means the use-case split must be derived from the specifications, not from performance tests.

The AMD Instinct MI325X targets workloads that prioritize raw FP32 compute and texture throughput. Its FP32 rating of 81.72 TFLOPS exceeds the NVIDIA B200 SXM6’s 69.34 TFLOPS, a difference of roughly 18% in favor of AMD. The texture rate of 2,553.6 GTexel/s is more than double the B200’s 1,083.4 GTexel/s. For scientific simulations, signal processing, or any application that relies on dense single-precision math, the MI325X holds a clear specification advantage.

The NVIDIA B200 SXM6 wins on memory bandwidth and interface connectivity. Its 8.19 TB/s of HBM3e bandwidth is a third higher than the MI325X’s 6.14 TB/s. The B200 also uses a PCIe 6.0 x16 bus interface, while the MI325X uses PCIe 5.0 x16, giving NVIDIA a generational lead in host-to-device transfer rates. Workloads that are memory-bound, such as large language model inference or graph analytics, would favor the B200 based on these numbers.

Neither card has display outputs, so both are exclusively for compute and server environments. The B200 ships with a launch MSRP of 34,999 USD, while the MI325X has no recorded launch price. The B200’s production status is listed as Active, whereas the MI325X has no production status recorded.

Architecture Differences

The two accelerators come from different architectural generations and use different chip designs. The AMD Instinct MI325X is built on CDNA 3.0 architecture, using the Aqua Vanjaram chip. The NVIDIA B200 SXM6 uses the Blackwell architecture with the GB100 chip. Both are fabricated by TSMC on a 5 nm process node, but the transistor counts diverge sharply.

NVIDIA packs 208,000 million transistors onto a 1628 mm² die, yielding a transistor density of 127.8 million transistors per square millimeter. AMD fits 153,000 million transistors onto a smaller 1017 mm² die, giving a higher density of 150.4 million transistors per square millimeter. The MI325X achieves better packing efficiency despite having fewer total transistors.

Memory configurations differ in capacity but share the same HBM3e type and 8192-bit bus width. The MI325X carries 256 GB of HBM3e, while the B200 has 180 GB. Despite having less memory, the B200 achieves higher bandwidth at 8.19 TB/s versus 6.14 TB/s, indicating faster memory clocks. The B200’s memory runs at 2000 MHz (8 Gbps effective), while the MI325X runs at 1500 MHz (6 Gbps effective).

Compute unit counts show AMD’s emphasis on parallel throughput. The MI325X has 19,456 shading units, 1,216 texture mapping units, and zero ROPs. The B200 has 18,944 shading units, only 592 TMUs, and 24 ROPs. NVIDIA also includes 592 tensor cores, a feature AMD’s CDNA 3.0 does not list. The MI325X’s pixel rate is 0 MPixel/s, while the B200 delivers 43.92 GPixel/s.

Clock behavior is notably different. The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The B200 has an extremely low base clock of 120 MHz but boosts to 1830 MHz. These figures suggest different power management strategies, though both cards share the same 1000 W TDP and 1400 W suggested PSU.

FAQ

Q: Which card has more memory?

A: The AMD Instinct MI325X has 256 GB of HBM3e, while the NVIDIA B200 SXM6 has 180 GB. Both use an 8192-bit bus.

Q: Which card offers higher memory bandwidth?

A: The NVIDIA B200 SXM6 delivers 8.19 TB/s, compared to the AMD Instinct MI325X’s 6.14 TB/s. The B200’s memory clock is 2000 MHz versus the MI325X’s 1500 MHz.

Q: Are these cards suitable for graphics rendering?

A: No. Neither card has display outputs. The MI325X also has 0 ROPs and a pixel rate of 0 MPixel/s. The B200 has 24 ROPs and a pixel rate of 43.92 GPixel/s, but both lack video outputs entirely.

Q: What is the launch date for each product?

A: The AMD Instinct MI325X launched on October 9, 2024. The NVIDIA B200 SXM6 launched on October 31, 2024, roughly three weeks later.

Q: Which card has tensor cores?

A: Only the NVIDIA B200 SXM6 lists tensor cores, with 592 units. The AMD Instinct MI325X does not list any tensor cores in its specifications.

Q: What is the production status of each card?

A: The NVIDIA B200 SXM6 is listed as Active. The AMD Instinct MI325X has no production status recorded in the database.

Specification Differences

The following fields differ between the AMD Instinct MI325X and the NVIDIA B200 SXM6:

• Chip: Aqua Vanjaram (AMD) versus GB100 (NVIDIA)
• Architecture: CDNA 3.0 versus Blackwell
• 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: 2100 MHz versus 1830 MHz
• Memory Clock: 1500 MHz 6 Gbps effective versus 2000 MHz 8 Gbps effective
• Memory Size: 256 GB versus 180 GB
• Memory Bandwidth: 6.14 TB/s versus 8.19 TB/s
• Shading Units: 19,456 versus 18,944
• Texture Mapping Units: 1,216 versus 592
• ROPs: 0 versus 24
• Tensor Cores: Not listed versus 592
• Pixel Rate: 0 MPixel/s versus 43.92 GPixel/s
• Texture Rate: 2,553.6 GTexel/s versus 1,083.4 GTexel/s
• FP32: 81.72 TFLOPS versus 69.34 TFLOPS
• FP16: 81.72 TFLOPS (1:1) versus 69.34 TFLOPS (1:1)
• Slot Width: OAM Module versus SXM Module
• Power Connectors: None versus not listed
• Bus Interface: PCIe 5.0 x16 versus PCIe 6.0 x16
• Release Date: October 9, 2024 versus October 31, 2024
• Predecessor: Radeon Instinct versus Server Hopper
• Successor: Not listed versus Server Rubin
• Launch MSRP: Not listed versus 34,999 USD (stated once here)
• Production Status: Not listed versus Active

Identical fields include manufacturer process node (TSMC 5 nm), HBM3e memory type, 8192-bit bus width, 1000 W TDP, 1400 W suggested PSU, no display outputs, and N/A API support for DirectX, OpenGL, and Vulkan.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results for these two accelerators. Both have zero wins in direct comparisons, and the avgBenchmarkScore field is zero for each. Without measured performance data, the specification sheet serves as the only basis for comparison.

The most significant gap appears in texture processing. The MI325X’s 2,553.6 GTexel/s is 2.36 times the B200’s 1,083.4 GTexel/s. This stems from the MI325X having 1,216 TMUs versus 592 on the B200. For workloads that stress texture fetch and filtering, the AMD part holds a commanding lead on paper.

Memory bandwidth is the B200’s strongest advantage. At 8.19 TB/s, it is 33% faster than the MI325X’s 6.14 TB/s. That gap matters for large matrix operations, embedding lookups, or any access pattern that saturates HBM bandwidth. The B200’s higher memory clock compensates for its lower capacity.

FP32 and FP16 compute both favor AMD. The MI325X delivers 81.72 TFLOPS in both precisions, while the B200 delivers 69.34 TFLOPS in both. The MI325X also has 512 more shading units, so its lead is consistent with the hardware configuration. The B200’s 592 tensor cores are not directly comparable to AMD’s shader-based compute, as no tensor performance numbers are recorded.

Pixel processing is the only category where the B200 has a non-zero result. The B200 produces 43.92 GPixel/s, while the MI325X produces 0 MPixel/s. Since neither card has display outputs, this difference likely has no practical impact for server deployments.

Clock speeds tell a mixed story. The MI325X has a higher boost clock at 2100 MHz versus 1830 MHz, but the B200’s base clock of 120 MHz is far below the MI325X’s 1000 MHz. The B200 likely relies on aggressive boosting under load, while the MI325X sustains a higher idle or minimum frequency.

The Verdict

The data shows two accelerators designed for different compute priorities. The AMD Instinct MI325X should be selected for workloads that depend on raw FP32 throughput, texture processing, or large memory capacity. Its 256 GB of HBM3e exceeds the B200’s 180 GB, and its 81.72 TFLOPS FP32 rating is higher by 12.38 TFLOPS. The 2,553.6 GTexel/s texture rate is more than double the NVIDIA part, making the MI325X the stronger choice for simulation codes or high-resolution data processing that stresses single-precision math.

The NVIDIA B200 SXM6 should be selected for memory-bound applications and modern server infrastructure. Its 8.19 TB/s bandwidth is the highest recorded among these two parts, and its PCIe 6.0 x16 interface is a full generation ahead of the MI325X’s PCIe 5.0 x16. The B200 also includes 592 tensor cores, which are absent from AMD’s specification sheet, suggesting an advantage for deep learning workloads that use tensor operations. Its 24 ROPs and 43.92 GPixel/s pixel rate are the only rasterization capabilities present, though both cards lack display outputs.

The MI325X launched on October 9, 2024, and the B200 on October 31, 2024. Both share the same 1000 W TDP and 1400 W suggested PSU, meaning system power delivery requirements are identical. The B200’s production status is Active, while the MI325X has no status recorded. The B200 carries a launch MSRP of 34,999 USD, while the MI325X has no listed price.

Neither card has benchmark data in the database, so all conclusions rest on specifications. For FP32-heavy scientific computing, the AMD Instinct MI325X is the better match. For memory bandwidth, tensor operations, and PCIe 6.0 connectivity, the NVIDIA B200 SXM6 is the better match. The choice comes down to whether the workload is compute-bound or memory-bound.