AMD Radeon RX 6450M vs NVIDIA B200 SXM6 Comparison

The Verdict

The AMD Radeon RX 6450M and NVIDIA B200 SXM6 occupy opposite ends of the GPU spectrum, and the data confirms they are not competitors in any practical sense. The RX 6450M is a mobile, low-power graphics processor designed for portable devices, while the B200 SXM6 is a server-class accelerator module with a 1000 W thermal envelope. The B200 SXM6 delivers 69.34 TFLOPS of FP32 compute against the RX 6450M's 3.779 TFLOPS, an 18.3-fold gap. In memory bandwidth, the B200 SXM6 provides 8.19 TB/s versus 128.0 GB/s, a 64-fold difference. The RX 6450M is the appropriate choice for compact, battery-powered systems needing basic rendering and display output. The B200 SXM6 is the choice for high-throughput compute workloads where power consumption and physical size are secondary concerns. The B200 SXM6 carries a launch MSRP of 34,999 USD.

Where Each One Wins

The RX 6450M wins in portability and integration. Its 50 W TDP allows operation without external power connectors, and its IGP slot width means it can be embedded directly into portable devices. The 6 nm process node and 107 mm² die size make it physically small, with a transistor density of 50.5M per mm². It supports PCIe 4.0 x4, DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, making it suitable for consumer graphics workloads. Its 4 GB GDDR6 memory on a 64 bit bus delivers 128.0 GB/s, sufficient for lightweight rendering tasks.

The B200 SXM6 wins in raw compute, memory capacity, and bandwidth. Its 180 GB HBM3e memory on an 8192 bit bus yields 8.19 TB/s, enabling massive data movement for server workloads. The 18944 shading units, 592 texture mapping units, and 592 tensor cores provide the parallel throughput necessary for AI and scientific computation. The PCIe 6.0 x16 interface doubles the bus bandwidth available to the RX 6450M's x4 link. The B200 SXM6 has no display outputs, confirming its role as a compute-only accelerator. Its 5 nm process node and 208,000 million transistors on a 1628 mm² die represent the high end of chip fabrication.

Architecture Differences

The RX 6450M uses the Navi 24 chip based on RDNA 2.0 architecture, part of the Navi Mobile generation. It has 768 shading units, 48 texture mapping units, 32 raster operation pipelines, and 12 ray tracing cores. Its FP16 throughput is 7.557 TFLOPS at a 2:1 ratio, meaning it halves FP32 throughput when computing FP16. The base clock is 2000 MHz, boost clock is 2460 MHz, and game clock is 2220 MHz. Memory runs at 2000 MHz with 16 Gbps effective data rate.

The B200 SXM6 uses the GB100 chip based on Blackwell architecture, part of the Server Blackwell generation. It has 18944 shading units, 592 texture mapping units, 24 raster operation pipelines, and 592 tensor cores. Its FP16 throughput matches FP32 at 69.34 TFLOPS with a 1:1 ratio, indicating equal processing capability for both precision formats. The base clock is 120 MHz and boost clock is 1830 MHz. Memory runs at 2000 MHz with 8 Gbps effective data rate. The B200 SXM6 has no DirectX, OpenGL, or Vulkan API support, indicating it is not designed for graphics rendering. The RX 6450M supports all three consumer APIs.

The process nodes differ: TSMC 6 nm for the RX 6450M versus TSMC 5 nm for the B200 SXM6. Transistor counts differ dramatically: 5,400 million versus 208,000 million. Die sizes are 107 mm² versus 1628 mm². Transistor density is 50.5M per mm² for the RX 6450M and 127.8M per mm² for the B200 SXM6, showing the B200 packs more than twice the transistors per area.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The B200 SXM6 delivers 69.34 TFLOPS of FP32, while the RX 6450M delivers 3.779 TFLOPS. The B200 SXM6 is approximately 18.3 times faster in this metric.

Q: What is the memory capacity difference?

A: The B200 SXM6 has 180 GB of HBM3e memory, whereas the RX 6450M has 4 GB of GDDR6 memory. The B200 SXM6 offers 45 times the capacity.

Q: Which GPU supports ray tracing?

A: The RX 6450M includes 12 ray tracing cores and supports DirectX 12 Ultimate (12_2). The B200 SXM6 does not list ray tracing cores and has no DirectX support.

Q: What are the power requirements?

A: The RX 6450M has a 50 W TDP and requires no power connectors. The B200 SXM6 has a 1000 W TDP and lists a suggested power supply of 1400 W.

Q: Which GPU has display outputs?

A: The RX 6450M has display outputs described as portable device dependent. The B200 SXM6 has no display outputs, confirming its compute-only design.

Q: What is the bus interface difference?

A: The RX 6450M uses PCIe 4.0 x4, while the B200 SXM6 uses PCIe 6.0 x16. The B200 SXM6's interface provides more lanes and a newer generation.

Head-to-Head Benchmarks

The database does not contain direct head-to-head benchmark scores between these two GPUs. The wins count is zero for each side, and the nearest rivals lists are empty. However, the specification data provides clear performance indicators.

In FP32 throughput, the B200 SXM6 achieves 69.34 TFLOPS, which is 18.3 times the RX 6450M's 3.779 TFLOPS. This is the largest compute advantage in the comparison. In FP16, the B200 SXM6 again delivers 69.34 TFLOPS with a 1:1 ratio, while the RX 6450M reaches 7.557 TFLOPS with a 2:1 ratio. The B200 SXM6 leads by 9.2 times in FP16.

Texture fill rate favors the B200 SXM6 at 1,083.4 GTexel/s versus 118.1 GTexel/s for the RX 6450M, a 9.2-fold difference. Pixel rate, however, favors the RX 6450M: 78.72 GPixel/s versus 43.92 GPixel/s. This is because the RX 6450M has 32 raster operation pipelines compared to 24 on the B200 SXM6, despite the B200's much higher shader count. The RX 6450M leads pixel throughput by 1.8 times.

Memory bandwidth shows the largest absolute gap: 8.19 TB/s for the B200 SXM6 versus 128.0 GB/s for the RX 6450M, a 64-fold difference. Memory bus width drives this: 8192 bit versus 64 bit. The B200 SXM6's HBM3e memory operates at 2000 MHz with 8 Gbps effective rate, while the RX 6450M's GDDR6 runs at 2000 MHz with 16 Gbps effective rate. The RX 6450M achieves higher per-pin data rate, but the B200's 128 times wider bus dominates total bandwidth.

Clock speeds differ significantly. The RX 6450M has a base clock of 2000 MHz and boost of 2460 MHz. The B200 SXM6 has a base clock of 120 MHz and boost of 1830 MHz. The RX 6450M operates at higher frequencies, but the B200 compensates with far more execution units.

Specification Differences

The two GPUs differ in nearly every recorded specification. The RX 6450M belongs to the Radeon RX 6000 series with a Navi 24 chip, while the B200 SXM6 uses the GB100 chip in the Server Blackwell generation. The RX 6450M's predecessor is Polaris Mobile; the B200 SXM6's predecessor is Server Hopper and successor is Server Rubin.

Release dates differ: January 3, 2023 for the RX 6450M versus October 31, 2024 for the B200 SXM6. Both are marked Active in production status.

Process node: 6 nm for AMD, 5 nm for NVIDIA, both from TSMC. Transistors: 5,400 million versus 208,000 million. Die size: 107 mm² versus 1628 mm². Transistor density: 50.5M per mm² versus 127.8M per mm².

Memory specifications diverge completely: 4 GB GDDR6 on 64 bit versus 180 GB HBM3e on 8192 bit. Bandwidth is 128.0 GB/s versus 8.19 TB/s. The RX 6450M memory rate is 16 Gbps effective; the B200 SXM6 is 8 Gbps effective.

Compute units: 768 shading units versus 18944. Texture mapping units: 48 versus 592. Raster operation pipelines: 32 versus 24. Ray tracing cores: 12 versus not listed. Tensor cores: not listed versus 592.

Pixel rate: 78.72 GPixel/s versus 43.92 GPixel/s. Texture rate: 118.1 GTexel/s versus 1,083.4 GTexel/s. FP32: 3.779 TFLOPS versus 69.34 TFLOPS. FP16: 7.557 TFLOPS (2:1) versus 69.34 TFLOPS (1:1).

Power: 50 W TDP with no power connectors versus 1000 W TDP with a 1400 W suggested power supply. Slot width: IGP versus SXM Module. Bus interface: PCIe 4.0 x4 versus PCIe 6.0 x16. Display outputs: portable device dependent versus no outputs.

API support: DirectX 12 Ultimate (12_2), OpenGL 4.6, Vulkan 1.4 for the RX 6450M. The B200 SXM6 lists N/A for DirectX, OpenGL, and Vulkan. The RX 6450M has no launch MSRP recorded; the B200 SXM6 lists 34,999 USD.

Both GPUs have a 50th percentile ranking against all GPUs in the database and an average benchmark score of zero. The RX 6450M has no nearest rivals recorded, and the B200 SXM6 also has no nearest rivals recorded.