AMD Instinct MI300 vs AMD Radeon RX 6450M Comparison

Head-to-Head Benchmarks

The recorded data shows a complete separation between these two AMD accelerators. The AMD Instinct MI300 and the AMD Radeon RX 6450M do not share a single common benchmark score in the database. Their performance profiles are defined entirely by their theoretical specifications, as no direct head-to-head benchmark results exist for this pairing.

The Instinct MI300 delivers 47.87 TFLOPS of FP32 compute, which is 12.67 times the RX 6450M's 3.779 TFLOPS. This is the defining numerical gap between the two. In FP16 workloads, the MI300 also produces 47.87 TFLOPS, but the RX 6450M leverages a 2:1 ratio to reach 7.557 TFLOPS, reducing the margin to roughly 6.33 times. The MI300's FP16 output is identical to its FP32 output, indicating a 1:1 ratio, while the Radeon part uses a 2:1 ratio that doubles its FP16 throughput relative to FP32.

Texture throughput follows the same pattern. The MI300 achieves 1,496.0 GTexel/s versus 118.1 GTexel/s for the RX 6450M, a 12.67-fold advantage. Pixel throughput inverts the hierarchy. The MI300 has a pixel rate of 0 MPixel/s, because it has 0 ROPs and no display outputs. The RX 6450M has 32 ROPs and produces 78.72 GPixel/s. For any rasterization workload that requires pixel output, the Radeon part is the only one of the two that can function at all.

Memory capacity and bandwidth show an even larger divide. The MI300 carries 128 GB of HBM3 across an 8192-bit bus, yielding 5.32 TB/s of bandwidth. The RX 6450M has 4 GB of GDDR6 on a 64-bit bus, yielding 128.0 GB/s. The MI300's bandwidth is 41.56 times higher. The bus width difference is 128-fold, and capacity is 32-fold. These are not incremental differences; they represent entirely different classes of hardware.

The RX 6450M counters with a base clock of 2000 MHz, a game clock of 2220 MHz, and a boost of 2460 MHz. The MI300 runs at 1000 MHz base and 1700 MHz boost. The Radeon part's boost clock is 44.7% higher than the Instinct's, and its base clock is double. Clock speed alone does not compensate for the massive differences in shader count, however. The MI300 has 14,080 shading units against 768, an 18.33-fold advantage. It also has 880 TMUs versus 48, an 18.33-fold gap.

The RX 6450M includes 12 ray tracing cores; the MI300 lists no ray tracing cores. The MI300 has no RT core entries, no pixel rate, and no display outputs, confirming that it is not built for graphics rendering. The RX 6450M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI300 lists all three APIs as N/A. In every graphics-specific metric, the RX 6450M is the only viable option.

The Verdict

The data indicates that these products have no overlapping use cases. The AMD Instinct MI300 is a compute accelerator with 128 GB of HBM3, 5.32 TB/s of memory bandwidth, and 47.87 TFLOPS of FP32 throughput. It has no display outputs, no raster output units, and no graphics API support. Its 600 W TDP and 1000 W suggested PSU place it in a data center power envelope. The RX 6450M is a 50 W mobile GPU with display outputs, 32 ROPs, 12 ray tracing cores, full DirectX 12 Ultimate support, and 78.72 GPixel/s of pixel throughput. It is designed to render frames and drive displays.

The MI300 wins on raw compute density, memory capacity, and memory bandwidth. It has 32 times the memory capacity, 41.56 times the memory bandwidth, and 12.67 times the FP32 performance of the RX 6450M. The RX 6450M wins on clock speed, pixel output, ray tracing capability, and API compatibility. Its 2460 MHz boost clock exceeds the MI300's 1700 MHz boost by 44.7%. These advantages are not comparable because they serve different functions.

A system builder choosing between these two parts is not choosing between two graphics cards. The MI300 cannot output video. The RX 6450M cannot approach the compute throughput of the MI300. The recorded data supports only one conclusion: the Instinct MI300 is for server-side compute and machine learning workloads, while the Radeon RX 6450M is for client-side graphics in a portable device.

Architecture Differences

The MI300 uses the CDNA 3.0 architecture, built on a 5 nm process at TSMC. The chip is named Aqua Vanjaram. The RX 6450M uses the RDNA 2.0 architecture, built on a 6 nm process at TSMC, with the Navi 24 chip. Both are manufactured by TSMC, but the node generation differs by one step.

Transistor counts reflect the scale difference. The MI300 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 density of 50.5M per mm². The MI300 has 28.33 times the transistor count and a 9.50 times larger die. Its density is 2.98 times higher, indicating a more complex design per unit area.

The MI300 has zero ROPs and zero pixel rate, which is consistent with a compute accelerator that never rasterizes. It also has no display outputs. The RX 6450M has 32 ROPs and 12 ray tracing cores, confirming that it is a full graphics pipeline. The MI300 has no ray tracing core entries in the database.

Memory architecture differs fundamentally. The MI300 uses HBM3 with a 5.2 Gbps effective data rate and an 8192-bit bus. The RX 6450M uses GDDR6 with a 16 Gbps effective data rate and a 64-bit bus. The MI300's memory clock is listed as 1300 MHz with 5.2 Gbps effective, while the RX 6450M's is 2000 MHz with 16 Gbps effective. The Radeon part has a higher per-pin data rate, but the Instinct's bus width is 128 times wider.

API support separates the two completely. The MI300 lists DirectX, OpenGL, and Vulkan as N/A. The RX 6450M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300 is not a graphics adapter by any metric in the database.

Specification Differences

The MI300 has a 5 nm process node; the RX 6450M has a 6 nm node. Transistors differ from 153,000 million to 5,400 million. Die size is 1017 mm² versus 107 mm². Transistor density is 150.4M per mm² versus 50.5M per mm².

Base clocks are 1000 MHz for the MI300 and 2000 MHz for the RX 6450M. Boost clocks are 1700 MHz versus 2460 MHz. The RX 6450M adds a game clock of 2220 MHz; the MI300 has no game clock entry. Memory clocks are 1300 MHz with 5.2 Gbps effective for the MI300, versus 2000 MHz with 16 Gbps effective for the RX 6450M.

Memory capacity is 128 GB of HBM3 versus 4 GB of GDDR6. Bus width is 8192 bit versus 64 bit. Bandwidth is 5.32 TB/s versus 128.0 GB/s.

Shading units are 14,080 versus 768. TMUs are 880 versus 48. ROPs are 0 versus 32. Ray tracing cores are absent on the MI300 and 12 on the RX 6450M. Pixel rate is 0 MPixel/s versus 78.72 GPixel/s. Texture rate is 1,496.0 GTexel/s versus 118.1 GTexel/s.

FP32 throughput is 47.87 TFLOPS versus 3.779 TFLOPS. FP16 throughput is 47.87 TFLOPS with a 1:1 ratio versus 7.557 TFLOPS with a 2:1 ratio.

TDP is 600 W versus 50 W. Power connectors are 2x 8-pin versus none. Suggested PSU is 1000 W for the MI300, with no entry for the RX 6450M. The bus interface is PCIe 5.0 x16 versus PCIe 4.0 x4. Display outputs are none versus portable device dependent.

Dimensions are 267 mm by 111 mm for the MI300; the RX 6450M has no listed dimensions. The MI300 has no production status, while the RX 6450M is marked active. Both released on 2023-01-03. The MI300's predecessor is Radeon Instinct; the RX 6450M's predecessor is Polaris Mobile.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI300 delivers 47.87 TFLOPS, which is 12.67 times the RX 6450M's 3.779 TFLOPS.

Q: Can the Instinct MI300 output video to a display?

A: No. The MI300 has no display outputs, 0 ROPs, and a pixel rate of 0 MPixel/s. The RX 6450M has display outputs and a pixel rate of 78.72 GPixel/s.

Q: How much memory does each GPU have?

A: The MI300 has 128 GB of HBM3 on an 8192-bit bus with 5.32 TB/s bandwidth. The RX 6450M has 4 GB of GDDR6 on a 64-bit bus with 128.0 GB/s bandwidth.

Q: Does the RX 6450M support ray tracing?

A: Yes, it has 12 ray tracing cores and supports DirectX 12 Ultimate (12_2). The MI300 has no ray tracing core entries and lists DirectX as N/A.

Q: Which GPU has a higher boost clock?

A: The RX 6450M boosts to 2460 MHz, which is 44.7% higher than the MI300's 1700 MHz boost.

Q: What are the power requirements for each GPU?

A: The MI300 has a 600 W TDP with 2x 8-pin power connectors and a 1000 W suggested PSU. The RX 6450M has a 50 W TDP and no power connectors.

Where Each One Wins

The Instinct MI300 wins in every compute-heavy category. FP32 throughput, FP16 throughput, texture rate, memory capacity, memory bus width, and memory bandwidth all favor the MI300 by wide margins. It uses a 5 nm process, integrates 153,000 million transistors, and carries 128 GB of HBM3. Its 47.87 TFLOPS FP32 and FP16 figures make it suitable for large-scale numerical workloads. The 5.32 TB/s memory bandwidth is 41.56 times the RX 6450M's, which matters for data sets that exceed 4 GB or require sustained high-throughput memory access. The PCIe 5.0 x16 interface also gives it a wider host connection than the RX 6450M's PCIe 4.0 x4.

The Radeon RX 6450M wins in every graphics-specific category. It has 32 ROPs and a 78.72 GPixel/s pixel rate, where the MI300 has zero. It has 12 ray tracing cores, where the MI300 has none. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI300 lists all three as N/A. Its 2460 MHz boost clock and 2220 MHz game clock are higher than the MI300's 1700 MHz boost. Its 50 W TDP, lack of power connectors, and portable device dependent display outputs make it compatible with mobile form factors. The MI300 requires a 1000 W suggested PSU and a 267 mm by 111 mm board footprint.

For rasterization, frame rendering, or any workload that ends in a display, the RX 6450M is the only functional choice. For dense compute, large memory footprints, or accelerator-class throughput, the MI300 is the only functional choice. The data does not support a mixed use case for either part.