AMD Instinct MI325X vs AMD Radeon RX 6450M Comparison

The Verdict

The AMD Instinct MI325X and AMD Radeon RX 6450M occupy entirely different segments of the GPU market, and the recorded data confirms there is no meaningful overlap in their intended use cases. The MI325X is a 1000 W OAM module designed for compute acceleration, with 256 GB of HBM3e memory and an 8192 bit bus. The RX 6450M is a 50 W integrated graphics solution for portable devices, with 4 GB of GDDR6 on a 64 bit bus. Neither GPU targets the same workload, platform, or user. The MI325X delivers 81.72 TFLOPS of FP32 performance, while the RX 6450M delivers 3.779 TFLOPS. The MI325X is roughly 21.6 times higher in raw FP32 throughput. The RX 6450M supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI325X reports no graphics API support at all. The data suggests the MI325X is for server and datacenter compute, and the RX 6450M is for integrated graphics in mobile systems. The Verdict is straightforward: the MI325X wins on every compute metric, and the RX 6450M wins on portability, graphics API compatibility, and power efficiency. There is no scenario in the data where one replaces the other.

Architecture Differences

The MI325X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, fabricated on a 5 nm TSMC process. The RX 6450M uses the Navi 24 chip built on RDNA 2.0 architecture, fabricated on a 6 nm TSMC process. The MI325X integrates 153,000 million transistors on a 1017 mm² die, giving a transistor density of 150.4M per mm². The RX 6450M integrates 5,400 million transistors on a 107 mm² die, giving a transistor density of 50.5M per mm². These figures indicate the MI325X is a massive compute-oriented chip, while the RX 6450M is a compact mobile part.

The MI325X has 19,456 shading units, 1,216 texture mapping units, and 0 ROPs. It reports 0 MPixel/s pixel rate, which aligns with its lack of display outputs. Its texture rate is 2,553.6 GTexel/s. The RX 6450M has 768 shading units, 48 TMUs, and 32 ROPs. It reports a pixel rate of 78.72 GPixel/s and a texture rate of 118.1 GTexel/s. The MI325X has no listed ray tracing cores, while the RX 6450M includes 12 ray tracing cores. This difference reflects the MI325X's focus on compute accelerators rather than graphics rendering.

The MI325X uses HBM3e memory with 256 GB capacity, 8192 bit bus width, and 6.14 TB/s bandwidth. Its memory clock is 1500 MHz with 6 Gbps effective data rate. The RX 6450M uses GDDR6 with 4 GB capacity, 64 bit bus width, and 128.0 GB/s bandwidth. Its memory clock is 2000 MHz with 16 Gbps effective data rate. The MI325X has 48 times the memory capacity and roughly 48 times the bandwidth of the RX 6450M. The MI325X's memory bus is 128 times wider. The MI325X uses no power connectors and is an OAM module, while the RX 6450M is an IGP with no power connectors and portable device dependent display outputs. The MI325X uses PCIe 5.0 x16, while the RX 6450M uses PCIe 4.0 x4. The MI325X reports no display outputs, and the RX 6450M reports outputs that depend on the portable device.

Head-to-Head Benchmarks

The recorded database contains no direct head-to-head benchmark entries for these two GPUs. The wins counters show 0 wins for each side, and the headToHeadBenchmarks array is empty. However, the specification data provides clear quantitative comparisons across multiple compute dimensions.

FP32 performance: the MI325X delivers 81.72 TFLOPS, while the RX 6450M delivers 3.779 TFLOPS. The MI325X is about 21.6 times higher. FP16 performance: the MI325X delivers 81.72 TFLOPS with a 1:1 ratio relative to FP32, while the RX 6450M delivers 7.557 TFLOPS with a 2:1 ratio. The MI325X is about 10.8 times higher in FP16 throughput. Texture rate: the MI325X achieves 2,553.6 GTexel/s, while the RX 6450M achieves 118.1 GTexel/s. The MI325X is about 21.6 times higher. Pixel rate: the MI325X reports 0 MPixel/s, while the RX 6450M reports 78.72 GPixel/s. The RX 6450M is the only one of the two with pixel output capability, which is consistent with its graphics-oriented architecture.

Memory bandwidth: the MI325X provides 6.14 TB/s, while the RX 6450M provides 128.0 GB/s. The MI325X is 48 times higher. Memory capacity: 256 GB versus 4 GB, a 64 times difference. Clock speeds: the MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. 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 MI325X compensates with vastly more shading units and memory bandwidth.

The MI325X's transistor count is 153,000 million versus 5,400 million for the RX 6450M, a 28.3 times difference. Die size is 1017 mm² versus 107 mm², a 9.5 times difference. Transistor density is 150.4M per mm² versus 50.5M per mm², indicating the MI325X packs nearly three times the transistors per square millimeter. The MI325X has a TDP of 1000 W, while the RX 6450M has a TDP of 50 W. The MI325X consumes 20 times the power budget of the RX 6450M. The MI325X suggests a 1400 W power supply, while the RX 6450M lists no suggested PSU.

Specification Differences

The two GPUs differ in nearly every specification field. Process node: 5 nm for the MI325X, 6 nm for the RX 6450M. Transistors: 153,000 million versus 5,400 million. Die size: 1017 mm² versus 107 mm². Transistor density: 150.4M per mm² versus 50.5M per mm². Base clock: 1000 MHz versus 2000 MHz. Boost clock: 2100 MHz versus 2460 MHz. The RX 6450M also has a game clock of 2220 MHz, which the MI325X lacks. Memory clock: 1500 MHz with 6 Gbps effective for the MI325X, 2000 MHz with 16 Gbps effective for the RX 6450M.

Memory size: 256 GB versus 4 GB. Memory type: HBM3e versus GDDR6. Bus width: 8192 bit versus 64 bit. Bandwidth: 6.14 TB/s versus 128.0 GB/s. Shading units: 19,456 versus 768. TMUs: 1,216 versus 48. ROPs: 0 versus 32. Ray tracing cores: none listed versus 12. Pixel rate: 0 MPixel/s versus 78.72 GPixel/s. Texture rate: 2,553.6 GTexel/s versus 118.1 GTexel/s. FP32: 81.72 TFLOPS versus 3.779 TFLOPS. FP16: 81.72 TFLOPS (1:1) versus 7.557 TFLOPS (2:1). TDP: 1000 W versus 50 W. Slot width: OAM Module versus IGP. Suggested PSU: 1400 W versus none. Bus interface: PCIe 5.0 x16 versus PCIe 4.0 x4. Display outputs: none versus portable device dependent. DirectX: N/A versus 12 Ultimate (12_2). OpenGL: N/A versus 4.6. Vulkan: N/A versus 1.4. Release date: 2024-10-09 versus 2023-01-03. Predecessor: Radeon Instinct versus Polaris Mobile. Production status: not listed versus Active. The MI325X belongs to the Instinct (MIx) generation, while the RX 6450M belongs to the Navi Mobile (RX 6000M) generation.

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI325X. It provides 6.14 TB/s of bandwidth through HBM3e memory on an 8192 bit bus. The Radeon RX 6450M provides 128.0 GB/s through GDDR6 on a 64 bit bus.

Q: Does the MI325X support any graphics APIs?

A: No. The database lists DirectX, OpenGL, and Vulkan as N/A for the MI325X. The RX 6450M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: What is the power consumption difference?

A: The MI325X has a TDP of 1000 W, while the RX 6450M has a TDP of 50 W. The MI325X also lists a suggested PSU of 1400 W, while the RX 6450M lists none.

Q: How do the FP32 performance figures compare?

A: The MI325X delivers 81.72 TFLOPS of FP32 performance, while the RX 6450M delivers 3.779 TFLOPS. The MI325X is approximately 21.6 times higher.

Q: Which GPU has display outputs?

A: The MI325X has no display outputs. The RX 6450M has display outputs that are portable device dependent.

Q: What are the release dates of these GPUs?

A: The MI325X was released on 2024-10-09, and the RX 6450M was released on 2023-01-03.

Where Each One Wins

The MI325X wins decisively in compute throughput. Its FP32 of 81.72 TFLOPS, FP16 of 81.72 TFLOPS, texture rate of 2,553.6 GTexel/s, and memory bandwidth of 6.14 TB/s place it far above the RX 6450M. The MI325X also wins on memory capacity with 256 GB versus 4 GB, on bus width with 8192 bit versus 64 bit, on transistor count with 153,000 million versus 5,400 million, and on die size with 1017 mm² versus 107 mm². Its PCIe 5.0 x16 interface is a generation ahead of the RX 6450M's PCIe 4.0 x4. The MI325X is the choice for workloads that demand massive memory pools and extreme compute density, such as large-scale accelerator deployments.

The RX 6450M wins on graphics features and portability. It has 32 ROPs and 12 ray tracing cores, while the MI325X has 0 ROPs and no listed ray tracing cores. The RX 6450M produces a pixel rate of 78.72 GPixel/s, while the MI325X produces 0 MPixel/s. The RX 6450M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI325X reports no API support. The RX 6450M is an IGP with a 50 W TDP, while the MI325X is a 1000 W OAM module. The RX 6450M also runs at higher clock speeds, with a boost clock of 2460 MHz and a game clock of 2220 MHz, compared to the MI325X's 2100 MHz boost clock. The RX 6450M is the choice for mobile systems requiring integrated graphics, ray tracing support, and low power consumption.

The data shows two GPUs with no overlap. The MI325X is a compute accelerator with no display outputs and no graphics API support. The RX 6450M is a mobile integrated GPU with full graphics API coverage and display capability. Each one wins in its respective domain, and the specification gap between them is consistent across every measured field.