AMD Instinct MI350X vs AMD Radeon RX 6450M Comparison

FAQ

Q: What are the core architectures of the AMD Instinct MI350X and the AMD Radeon RX 6450M?

A: The AMD Instinct MI350X uses the CDNA 4.0 architecture with the MI350 256CU chip, while the AMD Radeon RX 6450M uses the RDNA 2.0 architecture with the Navi 24 chip. The MI350X is built on a 3 nm process at TSMC, whereas the RX 6450M uses a 6 nm process, also at TSMC.

Q: How do the memory subsystems compare between these two GPUs?

A: The MI350X features 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth. The RX 6450M has 4 GB of GDDR6 memory on a 64-bit bus, providing 128.0 GB/s of bandwidth. The difference in memory bandwidth is substantial, with the MI350X offering roughly 64 times the bandwidth of the RX 6450M.

Q: What are the thermal design power (TDP) ratings for each GPU?

A: The AMD Instinct MI350X has a TDP of 1000 W and requires a suggested PSU of 1400 W. The AMD Radeon RX 6450M has a TDP of 50 W and has no suggested PSU listed in the database. The MI350X also uses an OAM Module slot width, while the RX 6450M is an IGP form factor.

Q: What are the FP32 compute capabilities of the two GPUs?

A: The MI350X delivers 72.09 TFLOPS of FP32 performance, with FP16 at 72.09 TFLOPS (1:1 ratio). The RX 6450M delivers 3.779 TFLOPS of FP32 and 7.557 TFLOPS of FP16 (2:1 ratio). The MI350X is approximately 19 times faster in FP32 compute.

Q: What display outputs do these GPUs support?

A: The AMD Instinct MI350X has no display outputs, as it is designed for compute workloads in an OAM Module form factor. The AMD Radeon RX 6450M's display outputs are listed as "Portable Device Dependent," reflecting its mobile IGP design.

Q: What API support does each GPU offer?

A: The RX 6450M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI350X lists N/A for DirectX, OpenGL, and Vulkan, consistent with its compute-focused accelerator design.

The Verdict

The data in the database draws a clear separation between these two AMD products. They target entirely different segments of the GPU market, and the recorded specifications confirm that no meaningful overlap exists in their intended workloads.

The AMD Instinct MI350X is a data center accelerator. Its 1000 W TDP, 288 GB HBM3e memory, 8192-bit bus, and 8.19 TB/s bandwidth position it for massive parallel compute tasks. The absence of display outputs and N/A API entries for graphics APIs reinforce this orientation. The MI350X uses the CDNA 4.0 architecture and the MI350 256CU chip on a 3 nm process. Its FP32 throughput of 72.09 TFLOPS and texture rate of 2,252.8 GTexel/s place it in a performance class that the RX 6450M cannot approach. The MI350X has 16,384 shading units and 1,024 TMUs, though it lists 0 ROPs and a pixel rate of 0 MPixel/s, further confirming that rasterization is not its function.

The AMD Radeon RX 6450M is a mobile graphics processor. Its 50 W TDP, IGP form factor, and 4 GB GDDR6 memory suit thin and light portable devices. The RX 6450M supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it a functional graphics solution for consumer applications. Its 768 shading units, 48 TMUs, 32 ROPs, and 12 ray tracing cores deliver 78.72 GPixel/s and 118.1 GTexel/s. The FP32 figure of 3.779 TFLOPS is modest but appropriate for its power envelope.

Benchmark results indicate that buyers should select based on workload, not price or preference. The MI350X is the only option for high-throughput compute, HBM3e memory capacity, and multi-TB memory bandwidth. The RX 6450M is the only option for mobile graphics, consumer API support, and low power consumption. Neither GPU can substitute for the other.

Head-to-Head Benchmarks

The database contains no direct head-to-head benchmark scores between the AMD Instinct MI350X and the AMD Radeon RX 6450M. The winsA and winsB fields both record 0, and the headToHeadBenchmarks array is empty. The comparison must therefore rely on the recorded specification data, which provides clear quantitative separations.

The largest gap appears in memory bandwidth. The MI350X delivers 8.19 TB/s from its HBM3e memory across an 8192-bit bus. The RX 6450M provides 128.0 GB/s from GDDR6 across a 64-bit bus. The MI350X exceeds the RX 6450M by a factor of approximately 64 in raw bandwidth. This difference directly reflects the intended compute density of the MI350X versus the power-constrained design of the mobile part.

Compute throughput shows a similarly decisive split. The MI350X achieves 72.09 TFLOPS FP32, while the RX 6450M achieves 3.779 TFLOPS FP32. The MI350X is roughly 19 times higher in FP32. In FP16, the MI350X again lists 72.09 TFLOPS, while the RX 6450M lists 7.557 TFLOPS, a multiplier of about 9.5. The 1:1 FP16 ratio on the MI350X indicates a balanced compute design, whereas the 2:1 ratio on the RX 6450M shows a consumer-oriented FP16 path.

Texture processing also favors the MI350X decisively. The MI350X reaches 2,252.8 GTexel/s from 1,024 TMUs. The RX 6450M reaches 118.1 GTexel/s from 48 TMUs. The MI350X is about 19 times faster in texture rate, closely matching the FP32 ratio. Pixel rate, however, reverses direction: the MI350X lists 0 MPixel/s with 0 ROPs, while the RX 6450M lists 78.72 GPixel/s from 32 ROPs. This confirms that the MI350X does not perform rasterization, while the RX 6450M does.

Shading unit counts reinforce the compute divide. The MI350X has 16,384 shading units, and the RX 6450M has 768. The MI350X carries 1,024 TMUs versus 48 on the RX 6450M. The RX 6450M includes 12 ray tracing cores, a feature absent from the MI350X's listed specifications. The MI350X lists no RT cores or tensor cores in the data.

Specification Differences

The two GPUs differ across nearly every measurable specification field in the database.

Process and die: The MI350X uses a 3 nm TSMC process with 185,000 million transistors on a 2380 mm² die. The RX 6450M uses a 6 nm TSMC process with 5,400 million transistors on a 107 mm² die. Transistor density is 77.7M per mm² for the MI350X and 50.5M per mm² for the RX 6450M.

Clocks: The MI350X has a base clock of 1000 MHz and a boost clock of 2200 MHz, with no game clock listed. The RX 6450M has a base clock of 2000 MHz, a boost clock of 2460 MHz, and a game clock of 2220 MHz. The RX 6450M runs at higher clock frequencies, but the MI350X compensates with vastly more compute units.

Memory: The MI350X has 288 GB of HBM3e, an 8192-bit bus, and 8.19 TB/s bandwidth. The RX 6450M has 4 GB of GDDR6, a 64-bit bus, and 128.0 GB/s bandwidth. The memory clock is listed as 2000 MHz with 8 Gbps effective for the MI350X, while the RX 6450M lists 2000 MHz with 16 Gbps effective.

Compute units: The MI350X has 16,384 shading units, 1,024 TMUs, and 0 ROPs. The RX 6450M has 768 shading units, 48 TMUs, 32 ROPs, and 12 ray tracing cores. Pixel rate is 0 MPixel/s for the MI350X and 78.72 GPixel/s for the RX 6450M.

Power and form factor: The MI350X has a 1000 W TDP, uses an OAM Module slot width, and has no power connectors listed. The RX 6450M has a 50 W TDP, uses an IGP slot width, and also has no power connectors listed. The MI350X suggests a 1400 W PSU; the RX 6450M has no suggested PSU.

Bus interface: The MI350X uses PCIe 5.0 x16. The RX 6450M uses PCIe 4.0 x4.

Dimensions: The MI350X measures 102 mm in length and 165 mm in width. The RX 6450M has no dimensions listed.

Display and APIs: The MI350X has no display outputs and N/A for DirectX, OpenGL, and Vulkan. The RX 6450M has portable-device-dependent outputs and supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Release dates: The MI350X was released on June 11, 2025. The RX 6450M was released on January 3, 2023. The MI350X lists its predecessor as Radeon Instinct, while the RX 6450M lists Polaris Mobile as its predecessor.

Architecture Differences

The MI350X and RX 6450M represent two distinct GPU architectures from AMD with different design goals.

The MI350X uses CDNA 4.0, AMD's compute-optimized architecture. The chip is designated MI350 256CU, indicating 256 compute units. The architecture is built for data center acceleration, with a 3 nm process and a 2380 mm² die. The transistor count of 185,000 million reflects a massive silicon footprint aimed at maximum parallel throughput. The MI350X supports 72.09 TFLOPS in both FP32 and FP16 with a 1:1 ratio, indicating equal processing paths for both precisions. Its memory architecture uses HBM3e across an 8192-bit interface, a configuration designed for bandwidth-hungry compute workloads. The lack of ROPs, pixel rate, display outputs, and graphics API support confirms that CDNA 4.0 does not prioritize rasterization or consumer graphics features. The MI350X belongs to the Instinct (MIx) generation and uses the Radeon Instinct lineage as its predecessor.

The RX 6450M uses RDNA 2.0, AMD's graphics-oriented architecture. The chip is Navi 24, a small design built on a 6 nm process with a 107 mm² die and 5,400 million transistors. The architecture includes 12 ray tracing cores, which the MI350X does not list. The RX 6450M supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, making it a full-featured graphics processor for mobile systems. Its FP16 throughput of 7.557 TFLOPS is double its FP32 throughput of 3.779 TFLOPS, reflecting a 2:1 ratio common in consumer GPUs. The memory interface is 64-bit GDDR6, appropriate for a 50 W mobile part. The RX 6450M belongs to the Radeon RX 6000 series and the Navi Mobile (RX 6000M) generation, with Polaris Mobile as its predecessor.

The architectural split is clear. CDNA 4.0 sacrifices graphics features, pixel output, and power efficiency for raw compute scale and memory bandwidth. RDNA 2.0 keeps graphics features, ray tracing, and consumer API support while operating at a fraction of the power. The MI350X has no RT cores listed, while the RX 6450M has 12. The MI350X has no display path, while the RX 6450M drives portable displays. The MI350X uses PCIe 5.0 x16, while the RX 6450M uses PCIe 4.0 x4. The MI350X lists no Vulkan, OpenGL, or DirectX support, while the RX 6450M lists current versions of all three. These differences trace directly to the two architectures' divergent purposes in the AMD product stack.